# GTBOP Processing Log: Weed Control in Ornamentals — Dr. Chris Marble
## Conversation Snapshot — February 27, 2026

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## Webinar Details

| Field              | Details                                                                                                                                                    |
| ------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Title**          | Weed Control in Ornamentals for the Nursery and Landscape                                                                                                  |
| **Speaker**        | Dr. Chris Marble, Associate Professor, Ornamental and Landscape Invasive Weed Management, Mid-Florida Research and Education Center, University of Florida |
| **Moderator**      | Dr. Shimat Joseph, UGA Turfgrass Entomologist                                                                                                              |
| **Webinar Date**   | July 13, 2023                                                                                                                                              |
| **Series**         | Green & Commercial                                                                                                                                         |
| **Duration**       | 50:38                                                                                                                                                      |
| **Topic Area**     | Weed Science                                                                                                                                               |
| **CEU Categories** | 10 (Private), 21, 23, 24, 27, 31, 32, 35                                                                                                                   |

---

## Pipeline Stages Completed

All five standard archive stages were completed in a single session:

| Stage | Deliverable | Filename |
|-------|-------------|----------|
| **1** | Corrected SRT | `GTBOP_Transcript_2023-07-13_WeedControlOrnamentals.srt` |
| **1** | Correction Summary | `GTBOP_Corrections_2023-07-13_WeedControlOrnamentals.md` |
| **2** | Archive Package | `GTBOP_Archive_Summary_2023-07-13_WeedControlOrnamentals.md` |
| **3** | YouTube Description | `GTBOP_YouTube_2023-07-13_WeedControlOrnamentals.md` |
| **3** | Website Version | `GTBOP_Website_2023-07-13_WeedControlOrnamentals.md` |
| **3** | Extension Agent Version | `GTBOP_ExtAgent_2023-07-13_WeedControlOrnamentals.md` |
| **4** | Moodle Quiz | `GTBOP_Quiz_2023-07-13_WeedControlOrnamentals.md` |
| **4** | Moodle Matching | `GTBOP_Matching_2023-07-13_WeedControlOrnamentals.md` |
| **5** | Prose Transcript | `GTBOP_ProseTranscript_2023-07-13_WeedControlOrnamentals.md` |

Stage 6 (Collaborative Writing Resources) was not requested for this webinar.

---

## Stage 1: Transcript Correction — What Happened

### Source File
- **Input:** `Weed_Control_in_Ornamentals_for_the_Nursery_and_Landscape_with_Dr__Chris_Marble.srt`
- **618 subtitle blocks**, 2,473 lines, read in full across 6 sequential chunks before any processing began

### Transcript Quality
This was an unusually correction-heavy transcript. Whisper struggled significantly with weed science terminology, producing **~80 individual corrections across 65+ blocks**. Two systematic errors dominated:

**1. "Herbicides" rendered 7+ different ways (~15 occurrences)**
Whisper could not capture the word "herbicides" and produced: "cervicides," "service sites," "surface sites," "service side," "service size," "services," and "pelvies sites." All were corrected to "herbicides" in context.

**2. "Weed species/spectrum" rendered as "wheat" (6 occurrences)**
Whisper consistently heard "wheat" instead of "weed" — corrected throughout.

### Other Major Correction Categories
- **Speaker name:** "Mahabou" → "Marble" (Whisper garbled the speaker's surname)
- **Institution:** "Mid-Florida Church and Education Center" → "Mid-Florida Research and Education Center"
- **Product names:** Heavy corrections needed — Specticle, SureGuard, Gallery, isoxaben, Finale, Fusilade, Basagran, Lontrel, Pennant Magnum, Axxe, Finalsan, FireWorxx, and many active ingredients (flumioxazin, indaziflam, clopyralid, sethoxydim, clethodim, fluazifop, fenoxaprop, acetic acid)
- **Technical terms:** "woody one of mills" → "woody ornamentals," "annual brograss" → "annual bluegrass," "gramaticides" → "graminicides," "mongongrass" → "mondo grass," etc.

### Audio Verification Round
Nine items were flagged `[VERIFY]` in the initial corrected SRT for audio confirmation. Rich checked all nine against the recording and provided resolutions:

| Block | Flagged Item | Resolution |
|-------|-------------|------------|
| 79 | "mills in the landscape" | **Corrected** → "ornamentals in the landscape" |
| 117 | "especially broadly, ornamental plants" | **Confirmed** as transcribed |
| 189 | "your men's and weeds" | **Corrected** → "you're managing weeds" |
| 472 | "Fireworks" | **Corrected** → "FireWorxx" |
| 525 | "Segment" | **Confirmed** as transcribed |
| 555 | "plan outs" (initially corrected to "plant apps") | **Confirmed** as "plan outs" — reverted |
| 592 | "not when wind speeds are below 5 mph" | **Confirmed** as transcribed |
| 612 | Repeated "Marengo" | **Corrected** → "SureGuard" |
| 613 | "Tau" (initially corrected to "Tower") | **Confirmed** as "Tower" |

After resolutions, zero VERIFY flags remain in the final corrected SRT.

### New Speaker for Reference Roster
Dr. Chris Marble is not in the existing GTBOP speaker reference. Recommended addition:

| Name | Affiliation |
|------|-------------|
| Dr. Chris Marble | Associate Professor, Ornamental and Landscape Invasive Weed Management, Mid-Florida Research and Education Center, University of Florida |

### New Correction Patterns
This transcript surfaced numerous product names not previously in the Common Corrections Reference. The correction summary includes a table of 14+ new Whisper-to-correct patterns for future use, including: cervicides → herbicides, Fireworks → FireWorxx, Axe → Axxe, Final Sand → Finalsan, acidic acid → acetic acid, gramaticides → graminicides, Pusillate → Fusilade, Basagram/Bacagrand → Basagran, Long Trail/Lontrell → Lontrel, clopyrrolid → clopyralid, Phenal → Finale, Pindemagnum → Pennant Magnum, Dazzaplam → indaziflam.

### Verification
- Block count: 618 original = 618 corrected ✓
- All 1,236 timestamps preserved exactly ✓
- No blocks merged or split ✓

---

## Stage 2: Archive Package — What Was Produced

The archive package contains three sections, all derived exclusively from the corrected transcript:

### Narrative Summary
- 385 words, flowing paragraphs, no bullet points
- Covers the full presentation arc: calibration fundamentals → pre/post-emergence timing → three-step herbicide selection → pre+post research results → glyphosate alternatives → selective herbicides → resources/Q&A
- Every topic traceable to specific transcript content

### YouTube Timestamps
- 38 chapter markers covering the full 50:38 duration
- First timestamp: `0:00` ✓
- Last timestamp: `49:08` (within 1:30 of end) ✓
- Density note: 38 entries across ~51 minutes is denser than the typical 3–5 minute interval. This presentation had unusually frequent topic transitions — Marble moved through substantial material quickly. The density reflects genuine content shifts, not over-segmentation.

### Questions & Answers
- 11 Q&A pairs (within the 8–12 target range)
- Mix of recall, application, and identification questions
- All answers derived directly from presentation content — no external information
- Covers calibration, timing, the three-step process, rotation importance, pre+post research, glyphosate alternatives, desiccant performance, selective options, signal words, and drift reduction

---

## Stage 3: Platform Optimization — Three Versions

### YouTube Description
- 4,914 characters (within ~5,000 limit)
- Condensed single-paragraph summary
- All 38 timestamps retained
- Q&A condensed to 4 highest-value pairs
- Hashtags included

### Website Version
- Full archive package from Stage 2
- Formatted for web publication with complete Q&A and resource links

### Extension Agent Version
- CEU category table prominently displayed with all 8 applicable categories
- Asynchronous viewing instructions for county agent CEU delivery
- Condensed content summary with a "Key Topics for CEU Relevance" section connecting material to license categories
- Full chapter list for video navigation

---

## Stage 4: Moodle Activities — Quiz and Matching

### Quiz
- **15 multiple choice questions** with answer keys
- Difficulty distribution: 53% Recall / 33% Application / 13% Analysis
- Coverage spans early (Q1–7: calibration, timing, environmental factors), middle (Q8–11: rotation, three-step selection, research), and late (Q12–15: alternatives, graminicides, signal words) portions of the presentation
- Every question includes timestamp references and transcript source citations
- No "all of the above" / "none of the above" options
- All distractors drawn from plausible but incorrect interpretations of presentation content

### Matching Exercises
Three exercises, each with distractors to prevent elimination guessing:

| Exercise | Type | Pairs | Distractors |
|----------|------|:-----:|:-----------:|
| 1: Post-Emergence Products & Characteristics | Product-Characteristic | 7 | 2 |
| 2: Pre-Emergence Mode of Action Groups | Product-Category | 6 | 1 |
| 3: Weed Management Timing & Practice | Timing-Practice | 8 | 2 |

---

## Stage 5: Prose Transcript — Full Conversion

The corrected SRT was converted into a readable markdown document preserving all 618 blocks of content in flowing prose.

### Structure
- ~9,300 words
- **14 H2 major sections** aligned to genuine topic transitions
- **24 H3 subsections** for distinct subtopics
- **24 speaker labels** at every change of speaker (17 Marble, 7 Joseph)
- **9 italicized active ingredient names** on first mention
- Source attribution footer with filename and block count

### Section Architecture
The H2/H3 structure follows Dr. Marble's own presentation flow:

1. Introduction
2. Why Herbicides Fail: Calibration and Application
3. Pre-emergent Herbicide Timing
4. Post-emergence Herbicide Timing
5. Importance of Developing a Program, Not Just Products
6. Three Steps to Choosing Herbicides
7. Year-Round Nursery Rotation Plan
8. Research: Pre-emergent + Post-emergent vs. Post-Only Programs
9. Application Interval Considerations
10. Landscape-Specific Rotation Planning
11. Post-emergence Alternatives to Glyphosate in Landscape Beds
12. Selective Post-emergence Options for Landscape Beds
13. UF Mid-Florida REC Resources and Contact Information
14. Questions and Answers (with H3 subheaders for each Q&A topic)

---

## Presentation Content Overview

For team members unfamiliar with this webinar, here's what Dr. Marble covered:

Dr. Marble presented a comprehensive, practical guide to building herbicide programs for ornamental nursery production and landscape maintenance. He began with **calibration** — identifying it as the #1 cause of herbicide failure and sharing free UF-developed calculators. He then covered **herbicide timing** for both pre-emergent (apply after soil settles, avoid tender new growth, reapply every 8–12 weeks in nurseries vs. 2–3 times/year in landscapes) and post-emergence applications (treat small, actively growing weeds; morning applications on clear days perform best).

The core of the presentation was a **three-step herbicide selection process**: (1) determine what's labeled/safe for the ornamental, (2) identify primary and secondary weed species by season, and (3) combine into a year-round rotation using different modes of action. He walked through this using **container-grown gardenia** as an example, referencing the **2017 Southeast Pest Control Guide** (compiled by Marble, Jeff Derr, and Joe Neal) for efficacy and safety ratings.

He presented **research showing that combining pre-emergent with post-emergence herbicides** reduced total herbicide active ingredient by 40–60% and costs by up to 30% versus post-only programs. He reviewed **glyphosate alternatives** (glufosinate, desiccant-type products like Axxe, Finalsan, FireWorxx) and highlighted **underutilized selective herbicides** — particularly graminicides (Segment, Envoy, Fusilade, Acclaim) that can be applied over the top of hundreds of broadleaf ornamentals.

The Q&A covered signal words/PPE requirements, drift reduction strategies, and Marengo use in nursery gravel areas.

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## Notes for Team

- **New speaker:** Dr. Chris Marble should be added to the reference roster for future processing
- **New correction patterns:** 14+ new Whisper error patterns documented in the correction summary — useful for future weed science transcripts
- **Broad CEU applicability:** This session carries 8 CEU categories, making it a strong candidate for cross-disciplinary certificate courses
- **Stage 6 not completed:** No publication project was identified for this webinar. The prose transcript is available if collaborative writing resources are needed later

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*Processing completed February 27, 2026*
*Pipeline: Stages 1–5 (standard archive + prose transcript)*
*Project: GTBOP Webinar Archive Processing (v4.0 instructions)*
