Re-publish Scharf Insecticide MOA session with updated deliverables

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/projects/insecticide-bulletin/compendium.md

@@ -1,8 +1,196 @@
-# Reference Compendium — Insecticide Basics
+# Insecticide Mode of Action — Quick Reference Compendium
+## Extracted from Dr. Michael Scharf's GTBOP Presentation (October 18, 2017)
 
-> **Placeholder** — Paste your Stage 6 reference compendium here.
+**Prepared by:** Rich Braman, UGA Cooperative Extension / Center for Urban Agriculture
+**For:** Dr. Dan Suiter & Dr. Michael Scharf — Bulletin revision reference
+**Source:** GTBOP_ProseTranscript_2017-10-18_InsecticideMOA.md
 
 ---
 
-*Source: Dr. Michael Scharf, GTBOP Structural — October 18, 2017*
-*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
+## Purpose
+
+This document consolidates every insecticide class, target site, product name, and relationship mentioned in Dr. Scharf's presentation into reference tables. These can serve as:
+
+- Quick-check references during the writing process
+- Source material for bulletin tables and figures
+- Verification that all content is accounted for in the revised bulletin
+
+All content below is derived exclusively from the presentation transcript. Items marked with ⚠️ may benefit from updating with current information.
+
+---
+
+## TABLE 1: Master Classification — All Nine Insecticide Classes
+
+### Neurotoxic Insecticides (5 classes)
+
+| # | Class | Target Site | Location on Neuron | Mode of Action | Effect on Insect | Representative Products |
+|---|-------|-------------|-------------------|----------------|-----------------|------------------------|
+| 1 | Pyrethroids / Pyrethrins / DDT | Sodium channels | Axon | Stimulation (modulation) | Excitation → knockdown, incoordination | Pyrethroids (various), pyrethrins |
+| 2a | Oxadiazines | Sodium channels | Axon | Blockage | Inhibition → paralysis ("on switch stuck off") | Indoxacarb |
+| 2b | Semicarbazones | Sodium channels | Axon | Blockage | Inhibition → paralysis | Metaflumizone |
+| 3a | Phenylpyrazoles | Chloride channels (GABA receptor) | Post-synaptic | Blockage | Excitation (blocks mellowing effect) | Fipronil |
+| 3b | Isoxazolines | Chloride channels | Post-synaptic | Blockage | Excitation | Fluralaner, sarolaner |
+| 3c | Avermectins | Chloride channels (glutamate receptor) | Post-synaptic | Stimulation | Inhibition → paralysis (opposite of fipronil) | Abamectin |
+| 4a | Neonicotinoids / Nicotinoids | Acetylcholine receptor | Post-synaptic (synapse) | Stimulation | Excitation | Imidacloprid (nicotinoid), clothianidin (neonicotinoid) |
+| 4b | Sulfoximines | Acetylcholine receptor | Post-synaptic (synapse) | Stimulation | Excitation | Sulfoxaflor |
+| 4c | Spinosyns | Acetylcholine receptor | Post-synaptic (synapse) | Stimulation | Excitation | Spinosad |
+| 5 | Organophosphates / Carbamates | Acetylcholinesterase enzyme | Synapse | Inhibition | Excitation (ACh accumulates) | Various ⚠️ |
+
+### Non-Neurotoxic Insecticides (4 classes)
+
+| # | Class | Target Site | Mode of Action | Effect on Insect | Representative Products |
+|---|-------|-------------|----------------|-----------------|------------------------|
+| 6 | Diamides | Neuromuscular calcium channels | Stimulation | Contraction → energy depletion → paralysis → death | Chlorantraniliprole, cyantraniliprole |
+| 7a | Juvenile hormone analogs (IGR) | Hormonal regulation of molting | Mimicry | Cuticle deformation, extra juvenile stages, population crash | Pyriproxyfen |
+| 7b | Chitin synthesis inhibitors (IGR) | Chitin synthesis enzyme | Inhibition | Death during molting; "jackknife effect" in termites | Various ⚠️ |
+| 8 | Mitochondrial respiration inhibitors | Mitochondria (respiratory chain) | Inhibition | Energy production failure → death | Hydramethylnon, chlorfenapyr, sulfuryl fluoride, methyl bromide ⚠️, DSOBTH, boric acid |
+| 9 | Cuticle dehydrating dusts | Epicuticular wax layer | Physical abrasion | Water loss → dehydration → death | Silica gel, diatomaceous earth |
+
+---
+
+## TABLE 2: Four Basic Modes of Action
+
+| Mode of Action | What It Does | Example Target | Example Insecticide Class |
+|----------------|-------------|----------------|--------------------------|
+| **Stimulation** | Causes target to become more active | Sodium channels → fire more | Pyrethroids |
+| **Blockage** | Shuts target off | Sodium channels → can't fire | Indoxacarb |
+| **Modulation** | Subtly changes target shape/function | Sodium channel conformation | Pyrethroids (also modulators) |
+| **Inhibition** | Prevents an enzyme from functioning | Acetylcholinesterase → can't degrade ACh | Organophosphates, carbamates |
+
+*Note: Scharf emphasized that ALL insecticide effects can be categorized into just these four types.*
+
+---
+
+## TABLE 3: Target Sites on the Neuron — Spatial Relationships
+
+| Location | Structure | Natural Function | Insecticides Targeting It |
+|----------|-----------|-----------------|--------------------------|
+| **Axon** (long body of nerve) | Sodium channels | "On switch" — opening initiates nerve impulse | Pyrethroids, pyrethrins, DDT (stimulate); Indoxacarb, metaflumizone (block) |
+| **Post-synaptic membrane** | GABA-gated chloride channels | "Mellowing" — negative chloride dampens activity | Fipronil, isoxazolines (block → excitation) |
+| **Post-synaptic membrane** | Glutamate-gated chloride channels | "Mellowing" — inhibitory | Avermectins/abamectin (stimulate → paralysis) |
+| **Post-synaptic membrane** | Acetylcholine receptors (nAChR) | Carry signal across synapse (sodium channel) | Neonicotinoids, sulfoximines, spinosyns (stimulate) |
+| **Synapse** | Acetylcholinesterase enzyme | Breaks down ACh after signal transmission | Organophosphates, carbamates (inhibit) |
+| **Neuromuscular junction** | Calcium channels | Trigger muscle contraction | Diamides (stimulate → sustained contraction) |
+
+---
+
+## TABLE 4: Products and Active Ingredients Mentioned
+
+| Active Ingredient / Product | Chemical Class | Target Site | Primary Use Mentioned | Notes |
+|----------------------------|---------------|-------------|----------------------|-------|
+| Pyrethrins | Natural pyrethroid | Sodium channels | General knockdown | Rapid knockdown; repellent |
+| Pyrethroids (various) | Synthetic pyrethroids | Sodium channels | General pest control | "Like pepper spray" — highly repellent; widespread bedbug resistance |
+| DDT | Organochlorine | Sodium channels | Historical reference | Same target site as pyrethroids |
+| Indoxacarb | Oxadiazine | Sodium channels (blocker) | Urban pest control | "Really big urban insecticide" |
+| Metaflumizone | Semicarbazone | Sodium channels (blocker) | Ectoparasites; possible urban | Newer product at time of presentation |
+| Fipronil | Phenylpyrazole | Chloride channels (blocker) | Urban pest control | Off-patent; consumer products available; "one of our biggest" |
+| Fluralaner | Isoxazoline | Chloride channels | Veterinary/pet (fleas) | Cross-resistance potential with fipronil |
+| Sarolaner | Isoxazoline | Chloride channels | Veterinary/pet (fleas) | Cross-resistance potential with fipronil |
+| Abamectin | Avermectin | Chloride channels (stimulator) | Gel baits | Opposite effect from fipronil despite similar target |
+| Imidacloprid | Nicotinoid | Acetylcholine receptor | Various | Example of "nicotinoid" (looks more like nicotine) |
+| Clothianidin | Neonicotinoid | Acetylcholine receptor | Various | Example of "neonicotinoid" (structurally evolved from nicotine) |
+| Sulfoxaflor | Sulfoximine | Acetylcholine receptor | Newer product | New class at same target site as neonics |
+| Spinosad | Spinosyn | Acetylcholine receptor | Landscape market | Same target site as neonics |
+| Nicotine | Natural alkaloid | Acetylcholine receptor | Historical (tobacco) | The original — toxic to insects and mammals |
+| Organophosphates (various) | Organophosphate | Acetylcholinesterase | Declining urban use | Not insect-specific; heavy restrictions |
+| Carbamates (various) | Carbamate | Acetylcholinesterase | Declining urban use | Not insect-specific; heavy restrictions |
+| Chlorantraniliprole | Diamide | Calcium channels (muscle) | Various | No signal word required by EPA; manufacturers added "Caution" |
+| Cyantraniliprole | Diamide | Calcium channels (muscle) | Various | Newer diamide |
+| Pyriproxyfen | Juvenile hormone analog | Hormonal (IGR) | Cockroach control | Wing twist indicator in cockroaches |
+| Hydramethylnon | Amidinohydrazone | Mitochondria | Cockroach bait | Energy production inhibitor |
+| Chlorfenapyr | Pyrrole | Mitochondria | Various (has food label) | Relatively safe; resistance potential noted |
+| Sulfuryl fluoride | Inorganic fluoride | Mitochondria | Fumigation | |
+| Methyl bromide | Halogenated hydrocarbon | Mitochondria | Fumigation | ⚠️ Largely phased out |
+| DSOBTH | Borate | Mitochondria/respiration | Wood treatment | Disodium octaborate tetrahydrate |
+| Boric acid | Borate | Mitochondria + gut lining | Various | Dual mode: chemical (respiration) + physical (abrasive/desiccant) |
+| Silica gel | Inorganic dust | Epicuticular wax | Dust application | Physical mode — abrades waxy layer |
+| Diatomaceous earth | Inorganic dust (biogenic) | Epicuticular wax | Dust application | Silicon from ground diatom exoskeletons |
+
+---
+
+## TABLE 5: Combination Products
+
+| Component 1 | Component 2 | Mechanism | Notes |
+|------------|------------|-----------|-------|
+| Neonicotinoid (acetylcholine receptor) | Pyrethroid (sodium channels) | Potentiation — two target sites simultaneously; "1+1=3" synergy | "All start with tea"; dual resistance observed in roach populations; still require rotation |
+
+---
+
+## TABLE 6: Insect-Specificity Spectrum
+
+| Insecticide Class | Mammalian Safety | Notes |
+|-------------------|-----------------|-------|
+| **Diamides** | Extremely high | No signal word required by EPA; 10,000+ x selectivity |
+| **Avermectins** | High | Insect-specific target |
+| **Isoxazolines** | High | Primarily vet/pet products |
+| **IGRs (JH analogs, CSIs)** | High | Target insect-specific developmental processes |
+| **Neonicotinoids** | Moderate-High | Insect-specific receptor but systemic/pollinator concerns |
+| **Fipronil** | Moderate-High | GABA receptor differences provide selectivity |
+| **Pyrethroids** | Moderate | Generally safe for mammals but repellent to insects |
+| **Organophosphates / Carbamates** | **Low** | **Not insect-specific; work against mammals equally** |
+
+*Spectrum based on Scharf's characterizations in the presentation. Not a quantitative ranking.*
+
+---
+
+## TABLE 7: Practical Field Indicators Mentioned
+
+| What You See | What It Means | Relevant Product/Class |
+|-------------|--------------|----------------------|
+| Immediate knockdown/incoordination | Sodium channel excitation | Pyrethroids, pyrethrins |
+| Paralysis (insect immobile but alive) | Sodium channel blockage OR chloride stimulation | Indoxacarb, abamectin |
+| Wing twist in cockroach nymphs/adults | Juvenile hormone disruption | Pyriproxyfen (JH analog IGR) |
+| "Jackknife" body curl in termites | Malformed cuticle from chitin synthesis disruption | Chitin synthesis inhibitors |
+| Lethargy and desiccation | Epicuticular wax loss | Silica gel, diatomaceous earth |
+| Sustained muscle contraction → stillness | Calcium channel stimulation → energy depletion | Diamides (chlorantraniliprole, cyantraniliprole) |
+
+---
+
+## TABLE 8: Key Physiological Barriers to Insecticide Penetration
+
+| Barrier | Location | Challenge for Insecticide | Relevant Formulation Strategy |
+|---------|----------|--------------------------|------------------------------|
+| Cuticle | External body surface | Multi-layered; waterproof; waxy epicuticle | Contact formulations must penetrate all layers |
+| Gut lining | Digestive tract interior | The "tube" inside is technically external to the body | Baits must cross gut wall to reach internal targets |
+| Tracheal system | Throughout body | Physical tubes, not blood-carried oxygen | Fumigants exploit this unique insect anatomy |
+
+---
+
+## TABLE 9: Key Terminology and Definitions from Presentation
+
+| Term | Definition (as explained by Scharf) |
+|------|--------------------------------------|
+| **LD50** | Lethal dose that kills 50% of test population; inverse relationship with toxicity (lower LD50 = more toxic) |
+| **Mode of action** | The action of an insecticide at its target site (stimulation, blockage, modulation, or inhibition) |
+| **Target site** | The specific protein or physiological location within the insect where an insecticide acts |
+| **Signal word** | EPA-required label indicator of acute toxicity (Danger, Warning, Caution); diamides so safe none was required |
+| **Potentiation** | Synergistic effect from hitting two target sites simultaneously; "one plus one equals three" |
+| **Trophallaxis** | Food sharing among social insects (from mouth and anus); insecticide transfer mechanism |
+| **Allogrooming** | Mutual grooming among social insects; insecticide transfer mechanism |
+| **Secondary kill** | Death of an individual from consuming insecticide-contaminated feces or carcass of a treated individual |
+| **Tertiary kill** | Death of a third individual from insecticide passed through two prior digestive tracts |
+| **IRAC** | Insecticide Resistance Action Committee; industry body that classifies MOAs and publishes rotation guidance |
+| **Wing twist** | Visible cuticle deformation in cockroaches exposed to juvenile hormone analog IGRs; field diagnostic indicator |
+| **Jackknife effect** | Body curling in termites with malformed cuticle from chitin synthesis inhibitor exposure |
+| **Epicuticle** | Outermost waxy/oily layer of insect cuticle; target of dehydrating dusts |
+| **Synapse** | Gap between neurons where electrical signals convert to chemical (neurotransmitter) signals |
+| **Acetylcholine** | Primary neurotransmitter that crosses synapses in the insect nervous system |
+| **GABA receptor** | Chloride channel type at post-synaptic membrane; target of fipronil |
+| **Glutamate receptor** | Chloride channel type; target of avermectins |
+
+---
+
+## Cross-Reference: Same Target Site, Different Effects
+
+One of the presentation's key teaching points was that different insecticide classes can target the same site but have opposite effects:
+
+| Target Site | Insecticide A | Effect A | Insecticide B | Effect B |
+|------------|--------------|---------|--------------|---------|
+| Sodium channels | Pyrethroids | Stimulation → excitation | Indoxacarb | Blockage → paralysis |
+| Chloride channels | Fipronil | Blockage → excitation | Abamectin | Stimulation → paralysis |
+
+*This contrast is valuable for teaching and for resistance management — switching between classes at the same site may still provide different selection pressures.*
+
+---
+
+*All data extracted exclusively from the October 18, 2017 GTBOP presentation by Dr. Michael Scharf as transcribed and corrected through the GTBOP archive pipeline. Items marked ⚠️ may have changed since the presentation date.*

docs/projects/insecticide-bulletin/index.md

@@ -1,35 +1,32 @@
----
-tags:
-  - Writing Projects
-  - Insecticides
-  - Scharf
-  - Suiter
----
+# Bulletin Writing Toolkit — Overview & Document Guide
+## Insecticide Basics for the Pest Management Professional — Bulletin Update
+### Based on Dr. Michael Scharf's GTBOP Presentation (October 18, 2017)
 
-# Insecticide Basics Bulletin — Writing Toolkit
-
-**Source Webinar:** Dr. Michael Scharf — Principles of Insecticide Classification and Mode of Action (October 18, 2017)
-**Collaborators:** Dr. Dan Suiter (UGA), Dr. Michael Scharf (Purdue)
-**Target Publication:** UGA extension bulletin on insecticide classification and mode of action for pest control professionals
+**Prepared by:** Rich Braman, UGA Cooperative Extension / Center for Urban Agriculture
+**For:** Dr. Dan Suiter (UGA) & Dr. Michael Scharf (Purdue University)
 
 ---
 
-## How This Toolkit Works
-
-This set of writing resources reorganizes Dr. Scharf's GTBOP presentation into a publication-ready structure. All content derives exclusively from the corrected transcript — no external information has been introduced.
-
-| Document | Purpose |
-|----------|---------|
-| [Bulletin Outline](outline.md) | Publication structure with content notes, transcript pointers, and writing notes |
-| [Reference Compendium](compendium.md) | Consolidated tables of insecticide classes, active ingredients, MOA groups, and terminology |
-| [Source Guide](source-guide.md) | Maps publication sections to exact transcript locations and video timestamps |
-
-### Using These Documents
-
-The **Outline** is your drafting roadmap — it tells you what goes where and flags areas needing current updates with ⚠️ markers. The **Compendium** is your quick-reference sheet for verifying classifications and relationships while writing. The **Source Guide** tells you exactly where to look in the video or transcript to verify any specific claim.
-
-⚠️ markers indicate content that may need updating since the 2017 presentation. These are flags for the subject matter experts, not corrections — the writing resources preserve what the speaker actually said.
+This package contains three documents designed to work together as a writing toolkit for the bulletin revision, all derived exclusively from the corrected and verified prose transcript of Mike's October 2017 GTBOP presentation.
 
 ---
 
-*Source: GTBOP Structural Pest Control Series / Processed for UGA Center for Urban Agriculture*
+### 1. Bulletin Draft Outline
+
+Reorganizes Mike's conversational presentation flow into a publication-ready six-part structure. Each section has content notes, key details, transcript pointers, and writing notes flagging where things may need updating (neonicotinoid regulation, methyl bromide phase-out, etc.). The editorial notes at the end call out which Q&A exchanges are strong candidates for integration into the body text rather than staying as standalone Q&A.
+
+### 2. Quick Reference Compendium
+
+Nine consolidated tables extracting every classification, product, target site, field indicator, and terminology definition Mike mentioned. The master classification table (Table 1) is essentially a draft of the summary table that could appear in the finished bulletin. Table 6 on the insect-specificity spectrum and the "same target site, opposite effects" cross-reference are the kind of things that make a reference bulletin actually useful on the truck.
+
+### 3. Source Guide
+
+Maps every proposed bulletin section to the exact transcript heading and approximate video timestamp. Also flags which content came exclusively from the Q&A with Dan — eleven topics that would be missed if someone only worked from the prepared slides. The flow comparison table at the end shows how the webinar's live sequence was restructured for publication logic.
+
+---
+
+Everything traces back to the corrected prose transcript as the single source of truth, so nothing in these documents introduces outside information. Items marked with ⚠️ flag spots where 2017 content will need current updates.
+
+---
+
+*Prepared from GTBOP webinar archive materials for UGA Center for Urban Agriculture.*

docs/projects/insecticide-bulletin/outline.md

@@ -1,8 +1,542 @@
-# Bulletin Outline — Insecticide Basics
+# Insecticide Basics for the Pest Management Professional
+## Bulletin Update Outline — Based on Dr. Michael Scharf's GTBOP Presentation (October 18, 2017)
 
-> **Placeholder** — Paste your Stage 6 bulletin outline here.
+**Prepared by:** Rich Braman, UGA Cooperative Extension / Center for Urban Agriculture
+**For:** Dr. Dan Suiter (UGA) & Dr. Michael Scharf (Purdue University)
+**Purpose:** Working outline to facilitate the bulletin revision, reorganizing Dr. Scharf's presentation content into publication-ready sections
+
+**Source document:** GTBOP_ProseTranscript_2017-10-18_InsecticideMOA.md (corrected and verified from 742-block SRT)
 
 ---
 
-*Source: Dr. Michael Scharf, GTBOP Structural — October 18, 2017*
-*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
+## How to Use This Document
+
+This outline restructures the webinar's conversational flow into a logical publication framework. Each section includes:
+
+- **Content notes** summarizing what Dr. Scharf covered on this topic
+- **Key details** listing specific facts, products, and examples mentioned
+- **Transcript location** pointing to the relevant section of the prose transcript for exact wording
+- **Writing notes** flagging areas that may need expansion, updating, or editorial decisions
+
+The webinar naturally covered some topics in a sequence optimized for a live audience. This outline regroups that content into the structure of a reference bulletin, consolidating related material that was spread across different parts of the talk.
+
+---
+
+## PART I: WHY UNDERSTANDING INSECTICIDE MODE OF ACTION MATTERS
+
+### Section 1.1 — Safety and Non-Target Toxicity
+
+**Content notes:** Modern insecticides are dramatically more selective than older chemistries. Some classes (diamides) have mammalian toxicity so low that EPA did not initially require a signal word. The ratio of insecticide placed in the environment to what actually reaches a target site in a pest is on the order of billions to one.
+
+**Key details from presentation:**
+- Modern insecticides can be 10,000+ times more toxic to insects than to mammals
+- Diamides had no signal word required by EPA; manufacturers voluntarily added "Caution"
+- Organophosphates and carbamates are NOT insect-specific — they work equally well against mammals, hence heavy restrictions
+
+**Transcript location:** "Why Understanding Mode of Action Matters" section; "Understanding LD50" section
+
+**Writing notes:** This is a strong opening hook for the bulletin. The 10,000x selectivity figure and the diamide signal word story are compelling for a practitioner audience. May want to update with any newer selectivity data post-2017.
+
+---
+
+### Section 1.2 — Interpreting Trade Literature and Advertising
+
+**Content notes:** Understanding how insecticides work gives practitioners the knowledge to critically evaluate manufacturer claims. Trade literature is not always technically accurate.
+
+**Key details from presentation:**
+- Scharf explicitly noted that advertising and trade literature "isn't always technically accurate"
+- Knowledge of MOA helps practitioners evaluate product claims independently
+
+**Transcript location:** "Why Understanding Mode of Action Matters" section
+
+**Writing notes:** Brief section. Could be expanded with specific examples of misleading claims if Dan and Mike wish.
+
+---
+
+### Section 1.3 — Pollinator Protection
+
+**Content notes:** Nicotinoids are systemic — they move through plants. Lawn applications can result in uptake by flowering plants in the landscape, exposing pollinators.
+
+**Key details from presentation:**
+- Nicotinoids move around in plants (systemic activity)
+- Lawn applications → flowering landscape plants → pollinator exposure pathway
+
+**Transcript location:** "Why Understanding Mode of Action Matters" section
+
+**Writing notes:** This was a brief mention in the webinar but has become a much larger regulatory and public concern since 2017. Strong candidate for significant expansion in the updated bulletin with current EPA actions, label changes, and best practices.
+
+---
+
+### Section 1.4 — Resistance Management
+
+**Content notes:** Product rotation is key to long-term success. Even combination products need rotation. Resistance is arguably the #1 cause of callbacks in cockroach accounts.
+
+**Key details from presentation:**
+- Resistance is "probably the number one cause of callbacks in cockroach accounts"
+- Cockroaches observed surviving on bait as sole food source for a month
+- Bedbug pyrethroid resistance is widespread; resistance to chlorfenapyr and nicotinoids emerging
+- Rotation recommendation: switch active ingredients every 3 months, ideally monthly
+- Combination products (neonicotinoid + pyrethroid) also need rotation — resistance to both AIs observed in roach populations
+- Not all active ingredients are compatible in rotation sequences; research is ongoing
+- IRAC (Insecticide Resistance Action Committee) provides mode of action classifications to guide rotation
+
+**Transcript location:** "Resistance" subsection under Practical Factors; Q&A sections on combination products and IRAC
+
+**Writing notes:** This section has substantial content from both the presentation body and the Q&A discussion. The Q&A exchange on combination product resistance is particularly valuable — Dan asked the tough question and Mike confirmed dual resistance. IRAC reference should include current web address and brief explanation of the classification numbering system.
+
+---
+
+### Section 1.5 — Product Sustainability and Customer Communication
+
+**Content notes:** Each insecticide costs hundreds of millions (potentially billions) to bring to market. Wise use extends market life. Understanding MOA helps practitioners communicate competence to customers.
+
+**Key details from presentation:**
+- Development cost: hundreds of millions to billions per product
+- Urban pest control market is a smaller slice of the pie than agriculture, which affects manufacturer investment in new urban AIs
+- Knowledge of nine major classes enables better customer communication
+- Q&A noted the industry is "generic heavy" — flow of new AIs has slowed
+
+**Transcript location:** "Why Understanding Mode of Action Matters" section; Q&A on new active ingredients
+
+**Writing notes:** The economics discussion from the Q&A adds good context. The point about urban market size vs. agriculture affecting R&D investment is practical industry knowledge worth including.
+
+---
+
+## PART II: INSECT PHYSIOLOGY — THE FOUNDATION
+
+### Section 2.1 — Overview of Insecticide-Relevant Physiology
+
+**Content notes:** Five key physiological systems are relevant to understanding how insecticides work. Scharf structured this as a compressed physiology primer — translating a semester course into key concepts.
+
+**Key systems covered:**
+1. **Nervous system** — controls all body functions; target of most insecticide classes
+2. **Cuticle** — complex multi-layered barrier; target of IGRs and dehydrating dusts; also a penetration barrier
+3. **Digestive system** — the gut interior is technically "outside" the body; a penetration barrier for ingested insecticides
+4. **Tracheal system** — physical tubes delivering air directly to cells (unlike mammalian lungs/hemoglobin); entry route for fumigants
+5. **Musculature** — controlled by nervous system; contains calcium channels targeted by diamides
+
+**Transcript location:** "Insect Physiology Overview" section and its subsections
+
+**Writing notes:** This section works well as a brief, illustrated primer in a bulletin. The tracheal system comparison (physical tubes vs. mammalian lungs/hemoglobin) and the gut-as-exterior concept are accessible explanations that help practitioners understand why different formulations work differently.
+
+---
+
+### Section 2.2 — How the Nervous System Works
+
+**Content notes:** Detailed explanation of nerve impulse transmission — electrical signals along neurons, chemical transmission across synapses via neurotransmitters, receptor binding.
+
+**Key details from presentation:**
+- Nervous system = millions of nerve cells
+- Central nervous system: brain, subesophageal ganglion, ventral nerve cord
+- Peripheral nerves extend throughout body
+- Electrical impulses travel along neurons
+- Synapses = gaps between neurons
+- Neurotransmitters (e.g., acetylcholine) carry signal across synapses
+- Receptors on receiving neuron are specific to neurotransmitter type
+- Finger-snap analogy for speed of neural transmission
+
+**Transcript location:** "How the Nervous System Works" section
+
+**Writing notes:** The finger-snap analogy is effective for a lay audience. The distinction between electrical (along neurons) and chemical (across synapses) transmission is foundational for understanding why different insecticide classes target different locations.
+
+---
+
+### Section 2.3 — Neurophysiology Demonstration
+
+**Content notes:** Scharf's lab can measure insecticide effects on the cockroach nervous system in real time using electrodes on the ventral nerve cord.
+
+**Key details from presentation:**
+- American cockroach dissected to expose ventral nerve cord
+- Electrode placed on nerve cord to measure electrical activity
+- Baseline recording (5 minutes) compared to post-treatment
+- Fipronil application → visible increase in firing rate and magnitude (neuroexcitation)
+
+**Transcript location:** "Neurophysiology in the Lab" section
+
+**Writing notes:** This is powerful visual content for a bulletin. If the electrophysiology traces (baseline vs. fipronil-treated) are available as figures, they would be excellent illustrations. Mike may have publication-quality versions of these from his research.
+
+---
+
+## PART III: INSECTICIDE CLASSIFICATION FUNDAMENTALS
+
+### Section 3.1 — Chemical Structure and Classification
+
+**Content notes:** Insecticide classification is based on chemical structure, analogous to how insect taxonomy is based on morphology. Different structures → different functions → different target sites.
+
+**Transcript location:** "Insecticide Classification and Target Sites" section
+
+---
+
+### Section 3.2 — Target Site and Mode of Action — The Key and Lock
+
+**Content notes:** The insecticide's chemical structure allows it to interact with a specific protein target in the insect. Modern computational chemistry can model these interactions (similar to drug discovery/design).
+
+**Key details from presentation:**
+- Target site = protein, usually with 3D structure
+- Insecticide "docks" with target protein
+- Key-and-lock analogy (simplified); actual molecular docking is far more complex
+- Drug discovery and insecticide design have significant overlap
+
+**Transcript location:** "The Key and Lock Analogy" section
+
+---
+
+### Section 3.3 — Four Basic Modes of Action
+
+**Content notes:** All insecticide effects at target sites fall into just four categories. This simplifying framework is how Scharf teaches toxicology at Purdue.
+
+**The four modes:**
+1. **Stimulation** — causes target to become more active (e.g., nerve fires more rapidly)
+2. **Blockage** — shuts target off (e.g., nerve kept from firing)
+3. **Modulation** — changes the shape/function of target subtly (e.g., pyrethroids)
+4. **Inhibition** — prevents an enzyme from doing its job (e.g., organophosphates inhibit acetylcholinesterase)
+
+**Transcript location:** "Four Basic Modes of Action" section
+
+**Writing notes:** This is a key pedagogical framework for the bulletin. The "only four ways" framing makes the whole topic approachable. A simple table or diagram showing these four categories with one example each would be very effective.
+
+---
+
+### Section 3.4 — Understanding LD50
+
+**Content notes:** The LD50 concept — the dose that kills 50% of test subjects — is essential for understanding relative toxicity and safety.
+
+**Key details from presentation:**
+- LD50 is inverse to toxicity: smaller LD50 = higher toxicity
+- Modern insecticides have high mammalian LD50s (safe) and low insect LD50s (effective)
+- Some products are 10,000+ times more toxic to target insects than to mammals
+- The actual amount of insecticide reaching a target site in a pest is a billionth or less of what's applied
+
+**Transcript location:** "Understanding LD50" section
+
+---
+
+## PART IV: NEUROTOXIC INSECTICIDES — FIVE CLASSIFICATIONS
+
+*Overview: Nine total insecticide classifications — five neurotoxic, four non-neurotoxic. This section covers the five that target the nervous system.*
+
+### Section 4.1 — Target Site Roadmap
+
+**Content notes:** Scharf provided a visual roadmap showing where each target site sits on the nerve/muscle junction. This is reference material for the detailed sections that follow.
+
+**Target sites on neurons:**
+- **Axon sodium channels** — the "on switch" for nerve firing (targeted by pyrethroids, indoxacarb, metaflumizone)
+- **Chloride channels** — post-synaptic; mellowing/inhibitory function (targeted by fipronil, isoxazolines, avermectins)
+- **Acetylcholine receptors** — post-synaptic; carry signal across synapse (targeted by neonicotinoids, spinosyns, sulfoximines)
+- **Acetylcholinesterase enzyme** — breaks down acetylcholine in synapse (targeted by organophosphates, carbamates)
+- **Neuromuscular calcium channels** — at nerve-muscle junction; control muscle contraction (targeted by diamides)
+
+**Transcript location:** "Target Site Roadmap" section
+
+**Writing notes:** This roadmap is the backbone of Part IV. A well-designed figure showing a schematic neuron/synapse/muscle junction with labeled target sites would be the single most valuable illustration in the bulletin. Scharf's presentation slides likely contain a version of this.
+
+---
+
+### Section 4.2 — Sodium Channel Insecticides
+
+**Stimulators: Pyrethroids, Pyrethrins, DDT**
+- Stimulate sodium channels → excitation → rapid knockdown
+- The "on switch" is jammed open
+- Pyrethroids are highly repellent to insects — "like pepper spray"
+- Visible effect: immediate incoordination and knockdown
+
+**Blockers: Indoxacarb (oxadiazine), Metaflumizone (semicarbazone)**
+- Block sodium channels → inhibition → paralysis
+- The "on switch" is stuck in the off position
+- Indoxacarb is a major urban insecticide
+- Metaflumizone has ectoparasite uses and possible urban applications
+
+**Transcript location:** "Classification 1: Sodium Channel Insecticides" section; Q&A on repellent vs. non-repellent
+
+**Writing notes:** The repellent/non-repellent distinction from the Q&A belongs here. Scharf's point that "the real distinction is pyrethroids and everything else" is a clean, practical takeaway. Pyrethroids are the repellent class; most other chemistries are not significantly detected by insects.
+
+---
+
+### Section 4.3 — Chloride Channel Insecticides
+
+**Blockers: Fipronil (phenylpyrazole), Isoxazolines (fluralaner, sarolaner)**
+- Chloride normally "mellows" neurons (negative charge dampens activity)
+- Blocking chloride flow → loss of inhibition → excitation
+- Fipronil is a major urban market product, now off-patent with consumer products available
+- Isoxazolines: newer class, primarily veterinary/pet products (flea market); cross-resistance potential with fipronil
+- Lab demonstration: fipronil application → rapid visible increase in nerve firing rate and magnitude
+
+**Stimulators: Avermectins (abamectin)**
+- Stimulate chloride channels → excess inhibition → paralysis
+- Opposite effect from fipronil at the same target site type
+- Abamectin is an effective gel bait active ingredient
+
+**Transcript location:** "Classification 2: Chloride Channel Insecticides" section
+
+**Writing notes:** The fipronil/abamectin contrast — same target site, opposite effects — is an excellent teaching point. Worth highlighting with a comparison callout or sidebar.
+
+---
+
+### Section 4.4 — Acetylcholine Receptor Insecticides
+
+**Stimulators: Neonicotinoids, Sulfoximines (sulfoxaflor), Spinosyns (spinosad)**
+- Stimulate the acetylcholine receptor → excitation
+- Neonicotinoids: huge current market share
+- Sulfoximines: newer class, same target site
+- Spinosyns: relevant for landscape market
+
+**Transcript location:** "Classification 3: Acetylcholine Receptor Insecticides" section
+
+**Writing notes:** The Q&A on nicotinoids vs. neonicotinoids is relevant here. Scharf explained: nicotinoids look more like nicotine (e.g., imidacloprid); neonicotinoids have evolved structurally but still target the same receptor (e.g., clothianidin). Dan's anecdote about tobacco killing caterpillars ties back to nicotine as the original insecticide. Also connect back to the pollinator discussion — systemic movement through plants.
+
+---
+
+### Section 4.5 — Acetylcholinesterase Inhibitors
+
+**Inhibitors: Organophosphates, Carbamates**
+- Inhibit the enzyme that breaks down acetylcholine in the synapse
+- Result: acetylcholine accumulates → continuous stimulation → excitation
+- **Not insect-specific** — works equally well against mammals/humans
+- Heavy regulatory restrictions for good reason
+
+**Transcript location:** "Classification 4: Acetylcholinesterase Inhibitors" section
+
+**Writing notes:** These are the "legacy" chemistry classes that most experienced practitioners know well. Worth noting their declining role in urban pest management and why (safety profile vs. newer options).
+
+---
+
+### Section 4.6 — Combination Products
+
+**Neonicotinoid + Pyrethroid combinations**
+- "All start with tea" (common naming pattern)
+- Hit two target sites simultaneously: acetylcholine receptor + sodium channels
+- Potentiation effect: synergy, "one plus one equals three"
+- Still not immune to resistance — dual resistance observed in cockroach populations
+- Must still be used in rotation
+
+**Transcript location:** "Classification 5: Combination Products" section; Q&A on combination product resistance
+
+**Writing notes:** The Q&A exchange adds important content here. Dan asked directly whether combo products at lower doses risk dual resistance, and Mike confirmed they do — evidence of resistance to both AIs in select roach populations. This is practical, industry-relevant information.
+
+---
+
+## PART V: NON-NEUROTOXIC INSECTICIDES — FOUR CLASSIFICATIONS
+
+### Section 5.1 — Muscular Calcium Channel Insecticides (Diamides)
+
+**Stimulators: Chlorantraniliprole, Cyantraniliprole**
+- Stimulate neuromuscular calcium channels → muscle contraction → energy depletion → paralysis → death
+- Timeline: contraction for hours, then paralyzed for days as energy depletes
+- Extremely safe for mammals — EPA did not initially require signal word
+- Manufacturers voluntarily added "Caution" signal word
+- Possibly selective even among insect groups (noted in Q&A re: earthworm question)
+
+**Transcript location:** "Muscular Calcium Channels (Diamides)" section; Q&A on chlorantraniliprole and earthworms
+
+**Writing notes:** The safety profile of diamides is a significant selling point and an important counternarrative to public concerns about pesticides. The earthworm question from the Q&A is worth noting — Scharf suspected some effect but noted the molecule's selectivity even among invertebrates.
+
+---
+
+### Section 5.2 — Insect Growth Regulators
+
+**Juvenile Hormone Analogs (e.g., pyriproxyfen)**
+- Mimic juvenile hormone → cuticle deformation + extra juvenile stages → population crash (juveniles can't reproduce)
+- Visible indicator: wing twist in cockroaches
+- Practical field tip: if you see wing twist in a new account, IGRs are already affecting the population — consider rotating to a different chemistry
+- Resistance concern with continuous use
+
+**Chitin Synthesis Inhibitors**
+- Inhibit the enzyme that forms cuticle during molting → death during molt
+- Visible indicator in termites: "jackknife effect" (body curling from malformed cuticle)
+- Effective against molting insects — acts at a very specific developmental window
+
+**Background on insect development covered:**
+- Three types of metamorphosis: ametabolous, hemimetabolous (roaches, termites, grasshoppers), holometabolous (flies, mosquitoes, caterpillars)
+- Complex hormonal control of molting and development
+- Cuticle tanning process in newly emerged adults (e.g., alate termites)
+
+**Transcript location:** "Insect Growth Regulators" section
+
+**Writing notes:** The wing-twist-as-field-indicator tip is highly practical for the target audience. The jackknife effect in termites is similarly useful. These are the kind of applied details that make a bulletin valuable to practitioners.
+
+---
+
+### Section 5.3 — Inhibitors of Energy Production
+
+**Target: Mitochondria (cellular respiration)**
+- Universal target — mitochondria exist in all organisms (plants, animals, insects, bacteria)
+- Different products affect different parts of the respiratory chain
+
+**Products mentioned:**
+- **Hydramethylnon** — cockroach bait active ingredient
+- **Chlorfenapyr** — has a food label; relatively safe; resistance potential noted
+- **Sulfuryl fluoride** — fumigant
+- **Methyl bromide** — fumigant (note: largely phased out since 2017)
+- **Disodium octaborate tetrahydrate (DSOBTH)** — wood treatment; disrupts insect respiration
+- **Boric acid** — disrupts respiration; also has physical mode of action (abrasive/desiccant effect on gut lining)
+
+**Transcript location:** "Inhibitors of Energy Production" section
+
+**Writing notes:** Boric acid's dual mode of action (chemical + physical) is an interesting detail worth highlighting. May need to update re: methyl bromide phase-out status and any newer products in this category since 2017.
+
+---
+
+### Section 5.4 — Cuticle Dehydrating Dusts
+
+**Products: Silica gel, Diatomaceous earth (DE)**
+- Physical mode of action — not a chemical toxicant
+- Abrade the waxy epicuticular layer → water loss → dehydration → death
+- Diatomaceous earth: ground exoskeletons of diatoms (silicon-based organisms)
+- Active component: silicon
+- Effect: lethargy, then death from desiccation
+
+**Transcript location:** "Cuticle Dehydrating Dusts" section
+
+**Writing notes:** Brief section. These products are simple in mechanism but important for IPM and for situations requiring non-chemical or minimal-chemical approaches.
+
+---
+
+## PART VI: PRACTICAL FACTORS AFFECTING INSECTICIDE PERFORMANCE
+
+### Section 6.1 — Stability, Persistence, and Formulations
+
+**Content notes:** Raw insecticides are oily, UV-sensitive, and would be unsafe to handle directly. Formulations solve all of these problems.
+
+**Key details:**
+- Most insecticides are oily (lipophilic) — helps cross cuticle and membranes but creates handling challenges
+- UV light degrades raw active ingredients rapidly
+- Insecticides can move with water despite not dissolving in it
+
+**Formulation functions:**
+- Enhance stability and extend longevity
+- Enhance safety
+- Ease handling and mixing
+- Keep AI suspended/dissolved in water
+
+**Formulation types mentioned:**
+- Baits, granulars, dusts, aerosols, fumigants
+- Liquid forms: emulsifiable concentrate (EC), wettable powder (WP), microencapsulated (ME), suspension concentrate (SC)
+
+**Transcript location:** "Stability, Persistence, and Formulations" section
+
+---
+
+### Section 6.2 — Pest Behavior and Insecticide Delivery
+
+**Content notes:** Natural pest behaviors can be exploited to enhance insecticide effectiveness. Three examples from the presentation.
+
+**Example 1: Cockroach secondary and tertiary kill**
+- Cockroach eats bait → dies → another roach feeds on carcass or feces → secondary kill
+- Insecticide can pass through two digestive tracts and still cause tertiary kill in a third roach
+
+**Example 2: Flea larval exposure**
+- Treated pet → adult fleas defecate insecticide → flea larvae feed on adult feces for nutrition → secondary exposure
+
+**Example 3: Social insect transfer (termites, ants)**
+- Trophallaxis (food sharing from mouth and anus) and allogrooming spread insecticides through colony
+- Slow-acting insecticides preferred → maximize colony penetration before detection
+
+**Transcript location:** "Pest Behavior" section
+
+**Writing notes:** These three examples are vivid and practical. The tertiary kill through two roach digestive tracts is a memorable detail. For the social insect section, note that Dave Oi's companion webinar on ants may have additional relevant content.
+
+---
+
+### Section 6.3 — Sanitation and IPM
+
+**Content notes:** Poor sanitation undermines even the best insecticide programs.
+
+**Key points:**
+- Excess food competes with bait placements
+- Clutter creates untreatable harborage
+- Dirt and grease physically bind insecticides, reducing contact
+- IPM mindset essential for maximizing insecticide effectiveness
+
+**Transcript location:** "Sanitation" section
+
+---
+
+### Section 6.4 — Resistance (expanded from Section 1.4)
+
+**Content notes:** Detailed resistance section drawing from both the main presentation and the extensive Q&A discussion.
+
+*See Section 1.4 above for key details. Consider consolidating here or cross-referencing.*
+
+**Additional Q&A content for this section:**
+- Resistance is inevitable with overuse — possible to any product
+- "Appropriate use for lengths of time and intensities of selection" determines outcome
+- IRAC classification system helps guide rotation decisions
+- IRAC website updated 1-2 times per year with complete landscape of available chemistries
+- Research on optimal rotation sequences is ongoing (Scharf lab)
+
+**Transcript location:** "Resistance" section; all Q&A segments on resistance and IRAC
+
+---
+
+### Section 6.5 — Oral vs. Dermal Toxicity
+
+**Content notes:** From Q&A — insecticides are almost always more toxic via ingestion than by contact.
+
+**Key details:**
+- Insect cuticle: waterproof, multi-layered barrier
+- Insect gut: thin cell layer, much less resistant to penetration
+- Mammalian skin: incredibly resistant barrier to insecticides/toxins
+- Practical implication: ingestion-based delivery (baits) can be highly effective at lower doses
+
+**Transcript location:** Q&A section "On Oral vs. Dermal Toxicity"
+
+**Writing notes:** This came up as an audience question but is foundational enough to warrant inclusion in the bulletin body rather than just Q&A.
+
+---
+
+### Section 6.6 — Essential Oils and 25B Products
+
+**Content notes:** From Q&A — the green revolution in pest management.
+
+**Key details:**
+- Consumer demand is the primary driver
+- 25B exempt actives (rosemary, spearmint, cedar) avoid registration costs
+- Effective as repellents (Dan: "very good repellents — we've done a lot of work with them on ants")
+- Not necessarily effective as toxicants
+
+**Transcript location:** Q&A section "On Essential Oils and 25B Products"
+
+**Writing notes:** This topic has grown considerably since 2017. Worth expanding with current market data and any efficacy research published since.
+
+---
+
+## SUPPORTING REFERENCES
+
+### Publications Cited in Presentation
+1. Scharf, M.E. & D.R. Suiter. 2011. "Insecticide Primer and Insecticide Mode of Action." *PCT Magazine*.
+2. Scharf, M.E. & D.R. Suiter. ~2007. "Insecticide Basics for the Pest Management Professional." UGA Cooperative Extension publication. *(The bulletin being updated)*
+
+### External Resources Mentioned
+- IRAC (Insecticide Resistance Action Committee) — mode of action classification charts, updated 1-2x annually
+
+---
+
+## EDITORIAL NOTES FOR DAN AND MIKE
+
+### Content that may need updating (2017 → present)
+- Neonicotinoid regulatory landscape (significant EPA and state-level changes since 2017)
+- Methyl bromide phase-out status
+- New products in the diamide and isoxazoline classes
+- Bedbug resistance — current scope of the problem
+- Essential oils / 25B market growth
+- Any new IRAC classifications added since 2017
+- Current status of Scharf lab rotation research (papers published?)
+- Fipronil patent/generic status update
+
+### Structural suggestions
+- The "nine classifications" framework (5 neurotoxic + 4 non-neurotoxic) is a clean organizing principle
+- The "four basic modes of action" framework should appear early as a conceptual anchor
+- Consider a one-page summary table at the end (see companion Reference Compendium)
+- The neurophysiology figure (target site roadmap) deserves a full-page treatment
+
+### Q&A content worth integrating
+Several valuable exchanges from the Q&A are better suited to the bulletin body than a standalone Q&A section:
+- Combination product resistance (Section 4.6)
+- Nicotinoid vs. neonicotinoid terminology (Section 4.4)
+- Oral vs. dermal toxicity (Section 6.5)
+- Repellent vs. non-repellent (Section 4.2)
+- IRAC as a practitioner resource (Section 6.4)
+
+---
+
+*Prepared from GTBOP webinar archive materials. All content derived exclusively from Dr. Scharf's October 18, 2017 presentation as transcribed and corrected through the GTBOP archive pipeline.*

docs/projects/insecticide-bulletin/source-guide.md

@@ -1,8 +1,129 @@
-# Source Guide — Insecticide Basics
+# Bulletin Source Guide — Transcript Section Mapping
+## Insecticide MOA Webinar → Bulletin Update
 
-> **Placeholder** — Paste your Stage 6 source guide here.
+**Prepared by:** Rich Braman, UGA Cooperative Extension / Center for Urban Agriculture
+**For:** Dr. Dan Suiter & Dr. Michael Scharf — Writing reference
+**Source:** GTBOP_ProseTranscript_2017-10-18_InsecticideMOA.md
 
 ---
 
-*Source: Dr. Michael Scharf, GTBOP Structural — October 18, 2017*
-*Processed for UGA Center for Urban Agriculture / GTBOP Archives*
+## Purpose
+
+This guide maps each proposed bulletin section (from the Bulletin Draft Outline) to the specific section of the prose transcript and the approximate video timestamps where that content appears. Use this to:
+
+- Quickly locate Mike's exact wording on any topic
+- Verify that bulletin content stays faithful to the source
+- Find passages to quote, paraphrase, or expand upon
+- Identify where Mike's Q&A responses add content beyond his prepared slides
+
+---
+
+## How to Use
+
+The **Transcript Section** column tells you which heading to search for in the prose transcript file. The **Video Timestamp** column gives the approximate time range if you need to re-watch the original recording. The **Content Type** column indicates whether the material comes from the prepared presentation or from the Q&A discussion with Dan.
+
+---
+
+## Mapping Table
+
+| Bulletin Section | Transcript Section | Video Timestamp | Content Type | Notes |
+|-----------------|-------------------|----------------|-------------|-------|
+| **PART I: Why Understanding MOA Matters** | | | | |
+| 1.1 Safety & non-target toxicity | "Why Understanding Mode of Action Matters" + "Understanding LD50" | ~2:55–5:35 + ~19:50–22:45 | Presentation | Safety framing at start; LD50 details in classification section |
+| 1.2 Interpreting trade literature | "Why Understanding Mode of Action Matters" | ~3:30–3:45 | Presentation | Brief mention — one sentence |
+| 1.3 Pollinator protection | "Why Understanding Mode of Action Matters" | ~3:36–4:00 | Presentation | Brief but important; expand with current info |
+| 1.4 Resistance management | "Resistance" + multiple Q&A sections | ~54:20–56:30 + ~57:55–59:50 | Both | Extensive Q&A content supplements presentation |
+| 1.5 Product sustainability & communication | "Why Understanding Mode of Action Matters" + Q&A on new AIs | ~4:15–5:50 + ~59:55–1:01:10 | Both | Economics from Q&A adds industry context |
+| | | | | |
+| **PART II: Insect Physiology** | | | | |
+| 2.1 Overview of relevant physiology | "Insect Physiology Overview" (all subsections) | ~8:25–13:58 | Presentation | Compressed physiology primer |
+| 2.2 How the nervous system works | "How the Nervous System Works" | ~23:45–26:45 | Presentation | Electrical + chemical transmission; synapse explanation |
+| 2.3 Neurophysiology demonstration | "Neurophysiology in the Lab" | ~26:50–28:40 | Presentation | Cockroach nerve cord + fipronil electrophysiology |
+| | | | | |
+| **PART III: Classification Fundamentals** | | | | |
+| 3.1 Chemical structure & classification | "Insecticide Classification and Target Sites" | ~14:00–15:15 | Presentation | Structure → function → target site relationship |
+| 3.2 Key and lock analogy | "The Key and Lock Analogy" | ~16:00–17:50 | Presentation | Key-lock + molecular docking + drug design parallel |
+| 3.3 Four basic modes of action | "Four Basic Modes of Action" | ~17:50–19:35 | Presentation | Stimulation, blockage, modulation, inhibition |
+| 3.4 Understanding LD50 | "Understanding LD50" | ~19:40–22:45 | Presentation | Inverse relationship; mammalian safety; billionths ratio |
+| | | | | |
+| **PART IV: Neurotoxic Insecticides** | | | | |
+| 4.1 Target site roadmap | "Target Site Roadmap" | ~28:40–32:15 | Presentation | Visual overview of all target site locations on neuron |
+| 4.2 Sodium channel insecticides | "Classification 1: Sodium Channel Insecticides" + Q&A repellency | ~32:20–34:10 + ~1:04:55–1:05:15 | Both | Pyrethroids/pyrethrins, indoxacarb, metaflumizone; "pepper spray" from Q&A |
+| 4.3 Chloride channel insecticides | "Classification 2: Chloride Channel Insecticides" | ~34:10–36:20 | Presentation | Fipronil, isoxazolines, abamectin; opposite effects at same site |
+| 4.4 Acetylcholine receptor insecticides | "Classification 3: Acetylcholine Receptor Insecticides" + Q&A nicotinoid terminology | ~36:20–37:30 + ~1:02:40–1:03:40 | Both | Neonics, sulfoximines, spinosyns; terminology clarification from Q&A |
+| 4.5 Acetylcholinesterase inhibitors | "Classification 4: Acetylcholinesterase Inhibitors" | ~37:28–38:02 | Presentation | OPs and carbamates; not insect-specific; brief section |
+| 4.6 Combination products | "Classification 5: Combination Products" + Q&A on dual resistance | ~38:03–39:10 + ~58:25–59:00 | Both | "Start with tea"; potentiation; confirmed dual resistance in Q&A |
+| | | | | |
+| **PART V: Non-Neurotoxic Insecticides** | | | | |
+| 5.1 Diamides (calcium channels) | "Muscular Calcium Channels (Diamides)" + Q&A on earthworms | ~39:55–41:30 + ~1:01:05–1:01:40 | Both | Safety profile; contraction → depletion timeline; earthworm selectivity from Q&A |
+| 5.2 Insect growth regulators | "Insect Growth Regulators" | ~41:40–45:20 | Presentation | JH analogs + CSIs; metamorphosis types; wing twist; jackknife effect |
+| 5.3 Energy production inhibitors | "Inhibitors of Energy Production" | ~45:20–46:50 | Presentation | Mitochondria targeting; hydramethylnon, chlorfenapyr, fumigants, borates |
+| 5.4 Cuticle dehydrating dusts | "Cuticle Dehydrating Dusts" | ~47:00–48:15 | Presentation | Silica gel, DE; physical mode of action; diatom origin |
+| | | | | |
+| **PART VI: Practical Factors** | | | | |
+| 6.1 Stability & formulations | "Stability, Persistence, and Formulations" | ~48:45–51:00 | Presentation | Lipophilic nature; UV degradation; formulation types and functions |
+| 6.2 Pest behavior | "Pest Behavior" | ~51:02–53:05 | Presentation | Secondary/tertiary kill; flea larvae; trophallaxis/allogrooming |
+| 6.3 Sanitation & IPM | "Sanitation" | ~53:05–54:20 | Presentation | Food competition, clutter, grease; IPM mindset |
+| 6.4 Resistance (expanded) | "Resistance" + Q&A segments | ~54:20–56:30 + multiple Q&A | Both | Rotation; cockroach bait resistance; IRAC; inevitability |
+| 6.5 Oral vs. dermal toxicity | Q&A: "On Oral vs. Dermal Toxicity" | ~1:03:55–1:04:45 | Q&A only | Cuticle vs. gut barriers; mammalian skin resistance |
+| 6.6 Essential oils & 25B | Q&A: "On Essential Oils and 25B Products" | ~1:05:30–1:06:40 | Q&A only | Consumer demand; repellent efficacy; registration cost advantage |
+
+---
+
+## Content That Comes Exclusively from Q&A
+
+The following material was only discussed during the Q&A exchange with Dan and would be missed if working only from the prepared presentation portion of the transcript:
+
+| Topic | Q&A Transcript Section | Why It Matters for the Bulletin |
+|-------|----------------------|-------------------------------|
+| Dual resistance to combo products | "On Combination Products and Resistance" | Confirms resistance to both AIs in field populations — critical practitioner info |
+| Inevitability of resistance | Same section | "Possible always" — frames the urgency of rotation |
+| New AI pipeline economics | "On New Active Ingredients" | Urban market size limits manufacturer investment — industry context |
+| IRAC as a practitioner tool | "On IRAC Classification" | Actionable resource for product rotation decisions |
+| Nicotinoid vs. neonicotinoid terminology | "On Nicotinoids vs. Neonicotinoids" | Clears up common confusion; imidacloprid vs. clothianidin example |
+| Chlorantraniliprole earthworm selectivity | "On Chlorantraniliprole and Earthworms" | Unique selectivity even among invertebrates — safety story |
+| Oral vs. dermal toxicity explanation | "On Oral vs. Dermal Toxicity" | Foundational concept not covered in prepared talk |
+| Repellent = pyrethroids, non-repellent = everything else | "On Repellent vs. Non-Repellent Insecticides" | Clean practical distinction for practitioners |
+| Essential oils / 25B market drivers | "On Essential Oils and 25B Products" | Consumer demand and green market trends |
+| Nicotine as insecticide (tobacco anecdote) | Within nicotinoid terminology discussion | Memorable historical connection |
+| Scharf's prior resistance webinar | Opening Q&A exchange | Suggests companion content exists for the resistance bulletin |
+
+---
+
+## Presentation Flow vs. Bulletin Structure
+
+The webinar followed this sequence (left), which differs from the proposed bulletin structure (right):
+
+| Webinar Order | → | Proposed Bulletin Order |
+|---------------|---|------------------------|
+| 1. Why MOA matters (motivation) | → | Part I: Why MOA Matters (motivation) |
+| 2. Insect physiology overview | → | Part II: Insect Physiology (foundation) |
+| 3. Insecticide classification basics | → | Part III: Classification Fundamentals |
+| 4. LD50 concept | → | Moved into Part III (Section 3.4) |
+| 5. Neurotoxic classes (5) | → | Part IV: Neurotoxic Insecticides |
+| 6. Non-neurotoxic classes (4) | → | Part V: Non-Neurotoxic Insecticides |
+| 7. Practical factors (stability, behavior, sanitation, resistance) | → | Part VI: Practical Factors |
+| 8. Summary | → | Distributed as section conclusions |
+| 9. Q&A with Dan | → | Integrated throughout relevant sections |
+
+**Key reorganization choices:**
+- LD50 was presented between physiology and classification; it fits better as a classification fundamental
+- Combination products were discussed within neurotoxics but could also warrant their own sidebar
+- Q&A content is distributed to the sections where it's most relevant rather than kept as a standalone section
+- The resistance discussion appears in both Part I (motivation) and Part VI (practical detail) — cross-reference or consolidate as preferred
+
+---
+
+## Companion Documents
+
+This source guide is part of a three-document set:
+
+1. **Bulletin Draft Outline** (`GTBOP_BulletinOutline_InsecticideMOA_Scharf.md`) — Section-by-section content notes and writing guidance
+2. **Quick Reference Compendium** (`GTBOP_ReferenceCompendium_InsecticideMOA_Scharf.md`) — Consolidated tables of all classifications, products, and relationships
+3. **This Source Guide** (`GTBOP_SourceGuide_InsecticideMOA_Scharf.md`) — Transcript location mapping
+
+All three draw exclusively from the same source: the corrected and verified prose transcript of Dr. Scharf's October 18, 2017 GTBOP presentation.
+
+---
+
+*Prepared from GTBOP webinar archive materials for UGA Center for Urban Agriculture.*