Slide Presentation

TITLE    (click title to view slides)
Classic® (chlorimuron) Effects on New Peanut Cultivars

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

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TABLE OF CONTENTS
  1. Classic® (chlorimuron) Effects on New Peanut Cultivars
  2. History of Classic® Use in Peanut
  3. Classic® Use in GA Peanuts* % of Acres Planted
  4. Georgia Certified Peanut Seed Acres - 2021 128,805.28 Total Acres
  5. Objective
  6. 2021 Peanut Cultivar/Classic® Test
  7. Classic®/Peanut Cultivar Tests - 2021
  8. Results
  9. Influence of Cultivar on Peanut Plant Height - 2021*
  10. Influence of Classic® Timing on Peanut Plant Height - 2021*
  11. Influence of Cultivar on Peanut TSWV - 2021*
  12. Influence of Classic® Timing on Peanut TSWV - 2021*
  13. Influence of Cultivar on Peanut Yield - 2021*
  14. Influence of Classic® Timing on Peanut Yield - 2021*
  15. Summary/Conclusions
  16. Future Research
  17. UGA Current Classic®/Cultivar Use Recommendations
  18. Questions/Comments?



SLIDE CONTENTS
  1. Classic® (chlorimuron) Effects on New Peanut Cultivars Eric P. Prostko*, Chad C. Abbott, Taylor M. Randell, and Robert C. Kemerait University of Georgia - Tifton
  2. History of Classic® Use in Peanut First registered for use in 1988 DuPont-Corteva-AMVAC Late-season control of Florida beggarweed 60 DAE until 45 DBH Peanut Response height/chlorosis cultivar tolerance Southern Runner GA-06G Tifguard
  3. Classic® Use in GA Peanuts* % of Acres Planted *Source: USDA/NASS (none reported in 2004, 2013, and 2018 surveys)
  4. Georgia Certified Peanut Seed Acres – 2021 128,805.28 Total Acres *83.4% GA-06G (83.4%) GA-16HO (4.4) TifNV High O/L (3.1%)
  5. Objective Evaluate new peanut cultivars to POST applications of Classic® (chlorimuron)
  6. 2021 Peanut Cultivar/Classic® Test Planting Date: April 29, 2021 Digging Date: September 23, 2021 (147 days) Twin rows/Thimet (INFR) 5 X 4 factorial 5 cultivars (GA-18RU, GA-20VHO, AUNPL-17, TIFNV High O/L, FLORUN 331) 4 Classic® Timings (0, 63, 75, 88 DAP) Classic® 25DG @ 0.5 oz/A + Induce @ 0.25% v/v 3 replications Weed-free Plant Height (110 DAP), TSWV (110 DAP), Yield ANOVA/PROC GLIMMIX No interaction between cultivar and Classic® timing (P>0.56) Tukey-Kramer (P<0.10)
  7. Classic®/Peanut Cultivar Tests - 2021 August 2 95 DAP GA-20VHO Florun-331 AUNPL-17 TifNV-High O/L GA-18RU
  8. Results Screven Co. 2021
  9. Influence of Cultivar on Peanut Plant Height - 2021* *Averaged over 4 Classic timings (0, 63, 75, and 88 DAP) Tukey’s (P<0.10)
  10. Influence of Classic® Timing on Peanut Plant Height - 2021* *Averaged over 5 cultivars (GA-18RU, GA-20VHO, AUNPL-17, TIFNV HIGH O/L, FLORUN 331) Tukey’s (P<0.10)
  11. Influence of Cultivar on Peanut TSWV - 2021* *Averaged over 4 Classic timings (0, 63, 75, and 88 DAP) Tukey’s (P<0.10)
  12. Influence of Classic® Timing on Peanut TSWV - 2021* *Averaged over 5 cultivars (GA-18RU, GA-20VHO, AUNPL-17, TIFNV HIGH O/L, FLORUN 331) Tukey’s (P<0.10)
  13. Influence of Cultivar on Peanut Yield - 2021* *Averaged over 4 Classic timings (0, 63, 75, and 88 DAP) Tukey’s (P<0.10)
  14. Influence of Classic® Timing on Peanut Yield - 2021* *Averaged over 5 cultivars (GA-18RU, GA-20VHO, AUNPL-17, TIFNV HIGH O/L, FLORUN 331) P=0.4778
  15. Summary/Conclusions Cultivar Effects GA-20VHO shorter than others (-15-27%) AUNPL-17 and GA-20VHO less TSWV than FLORUN 331 (-15%) GA-20VHO lower yield than AUNPL-17 (-18%) Classic® Effects 75 or 88 DAP = plant heights reduced (-13%) 88 DAP = TSWV increased (+10%) No effect on yield (P=0.4778)
  16. Future Research Repeated in 2022 Additional cultivars GA-12Y GA-16HO
  17. UGA Current Classic®/Cultivar Use Recommendations NO GA-06G Tifguard YES Florida-07 GA Greener GA-07W GA-09B GA-20VHO GA-18RU AUNPL-17 TIFNV HIGH O/L FLORUN 331
  18. Questions/Comments? Bulloch Co. 2021