Slide Presentation

TITLE    (click title to view slides)
2018 Conservation Tillage Weed Management

AUTHOR
Stanley Culpepper
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. 2018 Conservation Tillage Weed Management
  2. Reality of Weed Control
  3. Reality of Weed Control
  4. Palmer-Resistant Classes of Chemistry
  5. Level and Stability of Biomass is Important
  6. Palmer Will Exploit Any "Holes" in the Rye
  7. No herbicide vs herbicide
  8. After Cover is Terminated and it Rains; Planting will be Ideal for a Significant Amount of Time
  9. Many Cover Crop Options - Termination Tactics Differ.
  10. Cover Crop Termination - Grains
  11. Cover Crop Termination - Grains
  12. Wheat Response to Roundup Mixes Just Prior to Boot Stage of Growth. Mar 2018.
  13. Cover Crop Termination - Clover
  14. Controlling Clover with Burndown Herbicides. Mar 2018.
  15. Cover Crop Termination - Vetch
  16. Tillage Radish - scary to the weed guy
  17. Ryegrass-Resistant Classes of Chemistry
  18. Managing Ryegrass
  19. Burndown- 2,4-D vs Dicamba When Mixed with Roundup
  20. photo
  21. Gaps >1 Foot As Influenced by Production Practice. 2016 Expo.
  22. Methods For Rye Process
  23. photo
  24. photo
  25. photo
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  27. Dry Biomass lb/A AT Planting, 2016 Expo.
  28. Stanley Culpepper



SLIDE CONTENTS
  1. Stanley Culpepper UGA Extension Tifton, GA 2018 Conservation Tillage Weed Management
  2. Last new herbicide chemistry over 30 years ago. 2. New chemistry – not likely. 3. Don’t get confused, may have new “tools” but not new chemistry. Reality of Weed Control
  3. EPA - resistance mgmt plan. More policy/politics expected. More resistance is guaranteed! Loss of very effective herbicides are occurring each year especially in Palmer amaranth and ryegrass. Reality of Weed Control
  4. Palmer–Resistant Classes of Chemistry ALS inhibitors – Staple, Cadre EPSPS - Roundup PSII – Atrazine DNA – Treflan HPPD – Laudis PPO – Reflex, Valor
  5. Level and Stability of Biomass is Important 7000 lb/A 3000 lb/A 2000 lb/A dry weight
  6. Palmer Will Exploit Any “Holes” in the Rye
  7. No herbicide Herbicide
  8. After Cover is Terminated and it Rains; Planting will be Ideal for a Significant Amount of Time
  9. Many Cover Crop Options – Termination Tactics Differ.
  10. Cover Crop Termination – Grains Rye, oats, wheat, triticale, black oats ROUNDUP Gramoxone Stage of Growth Temp (nighttime) Rate/Tank Mixtures
  11. Cover Crop Termination –Grains Stage of Growth Temp (nighttime) Rate/Tank Mixtures Jointing through boot often more difficult but varies by crop planted Varies by crop – metabolic processes in plant slow making Roundup slower and often less effective Antagonism from tank mixtures is common, rate can often be used to overcome issues or sequential applic
  12. Wheat Response to Roundup Mixes Just Prior to Boot Stage of Growth. Mar 2018. RU PMAX 32 OZ/A; Liberty 32 oz/A; Valor 2 oz/A, Direx 1 pt/A 98 a 99 a RU 84 bc RU + Valor + Direx RU + Valor RU + Liberty 89 b
  13. Cover Crop Termination –Clover Difficult to control? Maturity influences response: Prebloom vs PostBloom?
  14. Controlling Clover with Burndown Herbicides. Mar 2018. RU PMAX 32 OZ/A; Liberty 32 oz/A; Valor 2 oz/A, Direx 1 qt/A; Gramoxone 1 qt/A; Engenia 9.5 oz/A. 78 c 100 a RU 92 b Gramoxone + Direx Liberty RU + Engenia 60 d
  15. Cover Crop Termination – Vetch Roundup + dicamba or Roundup + 2,4-D After Seed Set: Gramoxone + diuron (cotton)
  16. 1) Resistance. Allelochemical effect??? Mixtures with 2,4-D or dicamba should be effective Tillage Radish…scary to the weed guy
  17. Ryegrass–Resistant Classes of Chemistry Accase inhibitors – Poast, Select, Axial, etc ALS inhibitors – PowerFlex, Osprey, Beyond EPSPS - Roundup Long Chain Fatty – Dual/Warrants Glufosinate amm. - Liberty PS I – Electron - Gramoxone
  18. Managing Ryegrass If applying same chemistry 3 years in a row, resistant plants will likely be observed by 3 years. Roundup better than Gramoxone (unless plant fully mature). Best herbicide approach is to apply Roundup and follow with Gramoxone 5-7 days later.
  19. 2,4-D + ++ ++ ++ + 2,4-D Burndown: 2,4-D vs Dicamba When Mixed with Roundup dicamba ++ + + + + dicamba Horseweed Primrose Radish Cost Plantback
  21. Gaps >1 Foot As Influenced by Production Practice. 2016 Expo. Conventional = rip/bed no cover; Clover 12 lb/A = 7700 lb dry biomass; Rye 90 lb/A = 9970. Study maintained weed free with timely herbicide program 1 b 0 b Conventional 88 a Rye Clover Plots 18 feet by 450 1 month after planting
  22. Methods For Rye Process 25 extra units of N in rye program
  27. Study maintained weed free with timely herbicide program. 12502 a Blend R90 + C12 Dry Biomass LB/A AT Planting. 2016 Expo.
  28. Stanley Culpepper UGA Extension Tifton, GA