**Topic:** Entomology — Insecticide Classification and Mode of Action
**Speaker:** Dr. Michael Scharf, O.W. Rawlins Orkin Endowed Chair in Urban Entomology and Molecular Physiology, Department of Entomology, Purdue University, West Lafayette, IN
**Moderator:** Dr. Dan Suiter, Extension Entomologist, University of Georgia
- Early [~1:45]: Speaker states overarching goal to improve general knowledge of how insecticides work; discusses nervous system targeting vs. insect growth regulators
- Middle [~40:00]: Discusses muscular calcium channels and diamide insecticides (chlorantraniliprole, cyantraniliprole); notes EPA initially required no signal word due to low mammalian toxicity
- Late [~55:00]: Identifies resistance as probably the #1 cause of callbacks in cockroach accounts; cockroaches observed surviving on bait as sole food source for a month; recommends rotating active ingredients every 3 months or monthly
---
## Corrections Applied
### Proper Nouns — Speaker Names
- "Dr. Sharf" → "Dr. Scharf" (Line 23)
- "Dan Suter" → "Dan Suiter" (Line 311)
- "Dave Oy" → "Dave Oi" (Line 2243) — Confirmed via webinar announcement: Dr. David Oi, USDA-ARS, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL; presented "Fire Ants and Crazy Ants" in the same session
- "spinosins" → "spinosyns" (Line 1347 — IRAC Group 5 class name)
- "aloe grooming" → "allogrooming" (Line 2247)
- "the nicotines target" → "the nicotinoids target" (Line 1663 — speaker consistently uses "nicotinoids" elsewhere; Whisper truncated the word)
- "Pubigants" → "Fumigants" (Line 1967)
- "acetylcholinesterase, which is a neurotransmitter" → "acetylcholine, which is a neurotransmitter" (Line 1287 — acetylcholinesterase is an enzyme, not a neurotransmitter; the speaker is clearly describing acetylcholine crossing the synapse to bind its receptor; Whisper appended "-esterase" to "acetylcholine")
### Grammar
- "Dr. Thank you very much Dan." → "Thank you very much, Dan." (Line 43 — "Dr." is a Whisper artifact from the end of the moderator's introduction bleeding into the speaker's first line; comma added after "Dan")
### Flagged for Verification
- None remaining. Line 1207 ("need this acetylcholinesterase enzyme") was reviewed against audio and confirmed as accurate speech. Speaker is casually listing target sites from a slide; phrasing is informal but intelligible and left as-is per the principle of maintaining natural speech patterns.
---
## Notes
### Speaker Not in Reference Roster
Dr. Michael Scharf (Purdue University) is not currently listed in the GTBOP Common Speakers reference. Recommend adding:
| Name | Affiliation |
|------|-------------|
| Dr. Michael Scharf | Purdue University, Urban Entomology |
### Additional Speaker Confirmed for Roster
Dr. David Oi is confirmed via webinar announcement as a GTBOP presenter but is not currently in the Common Speakers reference. Recommend adding:
| Name | Affiliation |
|------|-------------|
| Dr. David Oi | USDA-ARS, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL |
### Nicotinoid vs. Neonicotinoid Terminology
The speaker intentionally uses "nicotinoids" (not "neonicotinoids") throughout most of the presentation. In the Q&A section (~01:02:46), he and Dr. Suiter discuss the distinction: nicotinoids structurally resemble nicotine, while neonicotinoids have evolved further structurally but still target the acetylcholine receptor. This is the speaker's deliberate classification framework and has not been altered.
### Webinar Date Confirmation
Date confirmed as October 18, 2017 via original program announcement email from Tami Adams Boyle. The event ran 7:00–10:00 AM EDT as part of the Structural Pest Control Webinar Series. Dr. Scharf's presentation "Principles of Insecticide Mode of Action" was paired with Dr. David Oi's "Fire Ants and Crazy Ants."
---
## SRT Format Compliance
✅ All timestamps preserved exactly as original
✅ All sequence numbers maintained (1–742)
✅ Blank lines between segments preserved
✅ Maximum 2 lines per subtitle segment maintained
✅ No segments merged or split
✅ Block count: 742 original = 742 corrected ✓
✅ Line count: 2,968 original = 2,968 corrected ✓
---
**Total Corrections:** 24 individual corrections across 24 lines
**Flagged for Verification:** 0 items (1 resolved via audio review)
