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AUTHOR
Dr. Eric P. Prostko
Extension Weed Specialist
University of Georgia
Tifton, GA

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TABLE OF CONTENTS
  1. Cost-Effective Weed Management in Peanuts
  2. How much do you spend on weed control?
  3. Weed Control in Peanuts - A Typical program
  4. Has the recent price reduction of Cadre made weed control in peanuts a no-brainer???
  5. What can we do better?
  6. Why must you read the label?
  7. Why must you read the label? - Avoid potential problems!
  8. Before anything else, calibrate your sprayer!!!
  9. Sprayer Calibration - Some Surveys said...
  10. The foundation of weed management in peanuts is the yellow/DNA herbicides!
  11. Hebicide Incorporation
  12. What about other soil-applied herbicides??
  13. Postemergence Herbicides
  14. Optimum Timing of POST Applications
  15. Palmer Amaranth Control with Blazer Applied at Different Timings
  16. "Expert" Systems
  17. HADSS - Herbicide Application Decision Support System
  18. What about reduced rates?
  19. What kind of grower might consider using reduced rates?
  20. Reduced Rates - Do they work???
  21. The Response of Weeds to Various Cadre Rates in Georgia
  22. The Response of Weeds to Various Cadre Rates in Georgia
  23. The Response of Weeds to Various Cadre Rates in Georgia
  24. Hophornbeam Copperleaf Control - Randolph County, GA - 2001
  25. Weed control in peanuts with reduced rates of Strongarm and Valor, 2002.
  26. Reduced rates can work if ...
  27. Cost-Effective Weed Management Summary
  28. University of Georgia Extension Weed Science



SLIDE CONTENTS
  1. Cost-Effective Weed Management in Peanuts Eric P. Prostko Extension Weed Specialist University of Georgia Tifton
  2. How much do you spend on weed control? USDA surveys indicate that peanut farmers in GA and AL spend $116/A on agri-chemicals 34% of total operating costs Source: USDA/ERS
  3. Weed Control in Peanuts A Typical program PPI: Sonalan (2 pts/A) = $5.66/A CRACK: Gramoxone Max (5.5 ozs) + Storm (1.5 pts) + NIS (0.25%) = $15.01/A POST: Cadre (1.44 ozs) + COC (1%) = $14.62/A Total Cost = $35.29/A
  4. Has the recent price reduction of Cadre made weed control in peanuts a no-brainer??? 50% price reduction cost no longer an obstacle What about cotton rotations? Should we still be applying reduced rates?
  5. What can we do better? read label calibration and measuring incorporation timeliness expert systems reduced rates???
  6. Why must you read the label? good source of info weeds rates timings potential problems
  7. Why must you read the label? Avoid potential problems!
  8. Before anything else, calibrate your sprayer!!! The only way to make sure the correct rate is applied. to low = poor control too high = waste money accurate measuring also important
  9. Sprayer Calibration Some Surveys said……… only 33% of operators were within 5% of target output (NE) 60% of the applicators were over or under applying pesticides by more than 10% (ND)
  10. The foundation of weed management in peanuts is the yellow/DNA herbicides! Sonalan, Prowl, Pendimax, Repose inexpensive Texas panicum Florida pusley must be incorporated by tillage or irrigation
  11. Herbicide Incorporation or Equally as effective Center-pivot irrigation is $2-7/A cheaper! Less variable?
  12. What about other soil-applied herbicides?? use as needed can be expensive need moisture broad spectrum may reduce/limit need for POST’S
  13. Postemergence Herbicides Timing,Timing, Timing!!!! Smaller weeds easier to control If removed early, weeds cause less or no effect on yield lower rates can be used don’t need 100% control
  14. Optimum Timing of POST Applications definitely probably No way!!!
  15. Palmer Amaranth Control with Blazer Applied at Different Timings Mayo et al. 1995 (KS)
  16. “Expert” Systems postemergence HERB (DOS) HADSS (Windows) weed density weed size yield goals economics
  17. HADSS Herbicide Application Decision Support System Web-based version is free Can be purchased for $95 Database needs to be updated for SE time input for scouting and data entry http://www.hadss.com
  18. What about reduced rates? not labeled but not illegal companies will not support failures not a guarantee to minimize crop rotation issues part of a total program future R&D and new products
  19. What kind of grower might consider using reduced rates? regularly calibrates his sprayer has irrigation or can predict when it will rain gets consistent weed control at full rates understands the difference between 2” and 4” can cover his acreage in a short time period is willing to scout his field regularly is willing to accept less than 100% weed control is not a lawyer or close friends with one A grower who ……...
  20. Reduced Rates Do they work???
  21. The Response of Weeds to Various Cadre Rates in Georgia Webster et al. 1997 Applied EPOST (C-2LF)
  22. The Response of Weeds to Various Cadre Rates in Georgia Webster et al. 1997 Applied EPOST
  23. The Response of Weeds to Various Cadre Rates in Georgia Webster et al. 1997 Applied EPOST
  24. Hophornbeam Copperleaf Control Randolph County, GA - 2001 6 WAT Untreated Strongarm (0.45 ozs/A) Valor (3 ozs/A) Strongarm 0.113 ozs + Valor 0.75 ozs/A
  25. Weed control in peanuts with reduced rates of Strongarm and Valor, 2002. Untreated Strongarm 0.45 oz/A Valor 3 oz/A Strongarm 0.113 oz/A + Valor 0.75 oz/A Attapulgus, GA 7 WAP
  26. Reduced rates can work if…….. The weed is susceptible good growing/application conditions exist the application is timely (small weeds) Full rates help to overcome variability of application due to weed size, improper sprayer calibration, environmental conditions, etc.
  27. Cost-Effective Weed Management Summary read label calibrate sprayer use yellow herbicides use other soil applied herbicides as weeds and rotations dictate make earlier applications with POSTS utilize “expert” systems? Reduced rates? Not for everyone or every situation but can work
  28. University of Georgia Extension Weed Science (gaweed.com)