Webinar Date: November 17, 2017
Speaker: Dr. Patrick McCullough, Weed Scientist, University of Georgia
Series: Green & Commercial
Course Context: Weed Science Certificate Course
Source: Corrected SRT (Stage 1) + Archive Package (Stage 2)
Matching Exercise 1: Weed Lifecycle Classification
Timestamp Reference: 10:16 – 15:06 (primary coverage area)
Type: Timing-Practice
Instructions: Match each weed species in Column A with its lifecycle classification as described by McCullough in Column B.
| # | Column A | Column B | |
|---|---|---|---|
| 1 | Henbit | a) Summer annual | |
| 2 | Crabgrass | b) Winter annual | |
| 3 | Purple nutsedge | c) Simple perennial | |
| 4 | Spotted spurge | d) Complex perennial | |
| 5 | Wild garlic | e) Cool-season perennial | |
| 6 | White clover | ||
| 7 | Annual bluegrass (Poa annua) | ||
| 8 | Goosegrass |
Answer Key:
1 → b, 2 → a, 3 → d, 4 → a, 5 → c, 6 → d, 7 → b, 8 → a
Notes: White clover is listed as a complex perennial alongside bermudagrass, Canada thistle, ground ivy, and the nutsedges. Wild garlic is McCullough’s example of a simple perennial that emerges from below-ground bulbs. Distractor “e” (cool-season perennial) is not used — McCullough does not assign this specific classification to any of the listed species; he describes white clover as a “cool season perennial” in passing (Block 91) but classifies it among complex perennials (Block 122).
Source in transcript: Blocks 94–122
Matching Exercise 2: Pre-Emergent Herbicide Products and Characteristics
Timestamp Reference: 27:00 – 37:05 (primary coverage area)
Type: Product-Characteristic
Instructions: Match each herbicide or product in Column A with the characteristic McCullough associates with it in Column B.
| # | Column A | Column B | |
|---|---|---|---|
| 1 | Prodiamine (Barricade) | a) Short residual activity; moderate duration in soil | |
| 2 | Siduron (Tupersan) | b) Strong on broadleaf weeds but weaker on grassy weeds | |
| 3 | Isoxaben (Gallery) | c) Long residual (4–6 months); strong on grassy weeds | |
| 4 | Specticle (indaziflam) | d) Different mode of action from dinitroanilines; very active on Poa annua | |
| 5 | Dithiopyr (Dimension) | e) Similar mode of action to dinitroanilines; cross-resistance with prodiamine for Poa annua | |
| 6 | Pendimethalin | f) Strong on grassy weeds; widely used for spring crabgrass control | |
| g) Can be impregnated on fertilizer for weed-and-feed applications |
Answer Key:
1 → c, 2 → a, 3 → b, 4 → d, 5 → e, 6 → f
Notes: Distractor “g” applies generally to several products McCullough mentions but is not specifically paired with any single product in this exercise. McCullough notes that pendimethalin and prodiamine are both widely used for crabgrass control; the distinguishing detail for prodiamine here is its longer residual.
Source in transcript: Blocks 243–333, 369–375
Matching Exercise 3: New 2018 Herbicide Products
Timestamp Reference: 55:01 – 1:09:53 (primary coverage area)
Type: Product-Ingredient
Instructions: Match each new product trade name in Column A with its active ingredient(s) or key characteristic in Column B.
| # | Column A | Column B | |
|---|---|---|---|
| 1 | RELZAR | a) Sulfentrazone + carfentrazone; rapid sedge and kyllinga knockdown | |
| 2 | Game On | b) Halauxifen + florasulam; one rate for all turfgrass species | |
| 3 | Switchblade | c) Pyrimisulfan + penoxsulam; granular with root uptake, no dew required | |
| 4 | Vexis | d) Halauxifen + 2,4-D choline + fluroxypyr; primarily cool-season grasses | |
| 5 | Solero | e) Simazine + imazaquin + prodiamine; pre + post combination | |
| 6 | Dismiss NXT | f) Mesosulfuron; comparable to SedgeHammer and halosulfuron for sedge control | |
| 7 | Coastal | g) Halauxifen + dicamba + fluroxypyr; labeled for warm-season including centipedegrass | |
| h) Sulfentrazone alone; long residual sedge control |
Answer Key:
1 → b, 2 → d, 3 → g, 4 → c, 5 → f, 6 → a, 7 → e
Notes: Distractor “h” describes standard Dismiss (sulfentrazone alone), which McCullough discusses but is not one of the new 2018 products. The key distinguishing features between RELZAR, Game On, and Switchblade are their secondary active ingredients and resulting turfgrass species labels.
Source in transcript: Blocks 505–644
Matching Exercise Summary
Total Exercises: 3
Total Pairs: 21 (8 + 6 + 7)
Distractors: 3 (1 per exercise)
Types: Timing-Practice (1), Product-Characteristic (1), Product-Ingredient (1)
Coverage: Lifecycles (early-mid presentation), Pre-emergent products (mid presentation), New products (late presentation)
Generated for UGA Center for Urban Agriculture / GTBOP Moodle Certificate Course — Weed Science
Source: Corrected SRT (Stage 1) — GTBOP_Transcript_2017-11-17_WeedControlTurf.srt (649 blocks)