Slide Presentation

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AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. New Weed Science Research Projects - Nicholas Shay and Dr. Eric Prostko
  2. Project(s) Overview
  3. Watermelon Production & Management
  4. Watermelon Production & Management
  5. Watermelon Production & Management
  6. Impact of Residuals on Sorghum (Sorghum bicolor)
  7. Sorghum Production Systems
  8. Sorghum: Preliminary Results
  9. Controlling Pink Purslane (Portulaca pilosa)
  10. Controlling Pink Purslane (Portulaca pilosa)
  11. Controlling Pink Purslane (Portulaca pilosa)
  12. Controlling Pink Purslane (Portulaca pilosa)
  13. Investigating New Peanut Cultivar Responses to Postemergence Applications of Chlorimuron
  14. Response to Chlorimuron
  15. Response to Chlorimuron
  16. Peanut Response to Delaye Timing Applications of Fluridone and Trifludimoxazin
  17. Peanut (GA-06G) Yield Response to Brake and Vulcarus Applied 1,3,5,7 DAP
  18. Thank you. Questions?



SLIDE CONTENTS
  1. New Weed Science Research Projects Nicholas Shay and Dr. Eric Prostko UGA Agent Training 2022
  2. Project(s) Overview Sorghum (Sorghum bicolor) Pink Purslane (Portulaca pilosa) Peanut (Arachis hypogaea) Corn (Zea mays) Soybean (Glycine max)
  3. Watermelon Production & Management $103,742,000 (NASS/USDA 2021)
  4. Watermelon Production & Management $103,742,000 (NASS/USDA 2021) (UGA Pest Management Handbook Veggies, 2021)
  5. Watermelon Production & Management $103,742,000 (NASS/USDA 2021)
  6. Impact of Residuals on Sorghum (Sorghum bicolor) 10 mos. 24 mos.
  7. Sorghum Production Systems Sorghum production in GA: GA - 41,000 acres Farm gate value $16 million (UGA Farmgate Report 2019) Objective: Simulating sorghum planting behind watermelon production Sorghum tolerance following fomesafen & terbacil applications 100 DAA
  8. Sorghum Response to Fomesafen 2019 PRE applications of Terbacil & Fomesafen: Did not reduce plant stand, and biomass (14 DAA) Did not reduce plant stand, and height (21 DAA) Yield: Range: 58 77 bu ac-1 or 3,657 4,781 lbs ac-1 Trt differences (P = 0.03) but none from NTC Sorghum: Preliminary Results 2020 2022 PRE applications of Terbacil & Fomesafen: Did not reduce plant stand, and biomass (14 DAA) Did not reduce plant stand, and height (21 DAA) Necrosis was observed 139 DAA transient by Sep. Yield: Range: 41 53 bu ac-1 or 2,519 3,254 lbs ac-1 No Trt differences (P > 0.1)
  9. TITLE Increased frequency Disturbed gravelly and sandy field edges Occurrence: Southwest Southeast (Railroad) Summer annual / weak-perennial 212,000 292,000 seeds plant-1 Germination ~ 10 days 6 8 weeks flowering / mature capsules Non-dormant seed Management difficulties: Succulent vegetative structures Densely populated hairs Continuous seed production Controlling Pink Purslane (Portulaca pilosa)
  10. TITLE Limited research for desired control in southeastern U.S. Objective: Investigating herbicidal options for controlling pink purslane in the coastal plain region of Georgia Controlling Pink Purslane (Portulaca pilosa)
  11. TITLE Controlling Pink Purslane (Portulaca pilosa) NTC Roundup PowerMaxx3: 22.0 oz ac-1 Gramoxone: 32.0 oz ac-1 Liberty: 32.0 oz ac-1 Engenia: 12.8 oz ac-1 Enlist One: 32.0 oz ac-1 Diuron: 24.0 oz ac-1 Aatrex: 48.0 oz ac-1 Ultra Blazer: 24.0 oz ac-1 Storm: 24.0 oz ac-1 2,4-DB: 16.0 oz ac-1 a Treatments followed by letter indicate efficacious herbicides selected from greenhouse experiment for in-field research. Strongarm: 0.30 oz ac-1 Cobra: 12.5 oz ac-1 Impact: 1.25 oz ac-1 Callisto: 3.0 oz ac-1 Laudis: 3.0 oz ac-1 Shieldex: 1.0 oz ac-1 Gramoxone 12.0 + Storm 16.0 oz ac-1 Reflex: 24.0 oz ac-1 AIM: 1.0 oz ac-1 Cadre: 4.0 oz ac-1 Greenhouse POST Treatments
  12. TITLE Controlling Pink Purslane (Portulaca pilosa)
  13. Rescue herbicide Chlorimuron TSWV Disease management Cultivar resistance Lack of understanding on new cultivars Investigating New Peanut Cultivar Responses to Postemergence Applications of Chlorimuron Objective: Evaluate impact of chlorimuron on the incidence of TSWV and yield on AUNPL-17, FLORUN 331, GA-12Y, GA-16HO, GA-18RU, GA-20VHO, & TIFNV HIGH O/L
  14. Response to Chlorimuron AUNPL-17 TIFNV HIGH O/L GA-20VHO FLORUN 331 + Varieties with different letter indicated statistical difference at (P = 0.05). GA-18RU TSWV: No interaction between variety & herbicide (P = 0.38) Avg. over variety, classic timing @ 90 DAP TSWV (P < 0.1) Avg. over herbicide, some variety differences:+ FLORUN 331 29.7%a GA-18RU 19.6%b TIFNV HIGH O/L 18.8%b GA-20VHO 10.4%c AUNPL-17 8.6%c Yield: No interaction between variety & herbicide (P = 0.30) Avg. over variety, no yield difference at any timing (P = 0.12) No yield difference regardless of TSWV (P > 0.1)
  15. GA-16HO Plant height: 65 & 77 DAP (P = 0.01) TSWV: No trt. influence (P = 0.13) Yield: No yield difference (P = 0.30) 4833 5835 lbs ac-1 Response to Chlorimuron GA-12Y Plant height: No trt. Influence (P = 0.43) TSWV: No trt. Influence (P = 0.16) Yield: Trt differences (P = 0.05) 77a = 6772 lb ac-1 0ab = 6573 lb ac-1 65ab = 6432 lb ac-1 90b = 5943 lb ac-1
  16. Limited herbicide options Herbicide resistance Newly developed herbicides Repurpose herbicides Objective: Test peanut response to delayed timing applications of fluridone & Trifludimoxazin Application timing: 1,3,5, & 7 DAP Peanut Response to Delayed Timing Applications of Fluridone and Trifludimoxazin
  17. Peanut (GA-06G) Yield Response to Brake and Vulcarus Applied 1,3,5,7 DAP P = 0.8992 P = 0.1462
  18. Thank you. Questions?