Slide Presentation

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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. Get the Most from Your POSTs (Improving POST Herbicide Performance)
  2. POST Herbicide Performance
  3. Topic for Discussion: calibration
  4. Sprayer Calibration. Some Surveys said...
  5. Topic for Discussion: timing
  6. Postemergence Herbicide. Applications and Weed Size
  7. Optimum Timing of POST Applications
  8. A Few Exceptions to the Rule. Controlling Bigger Weeds
  9. Topic for Discussion: adjuvants
  10. Herbicide Adjuvants. Types
  11. Herbicide Adjuvants. What do they do??
  12. The influence of additives on sicklepod control with Cadre - 68 DAT
  13. Herbicide Adjuvants
  14. Topic for Discussion: nozzle selection
  15. Nozzle Selection (contact or systemic herbicide?)
  16. Nozzle / Herbicide Chart
  17. Topic for Discussion: spray volume
  18. Spray Volume
  19. Topic for Discussion: antagonism
  20. Antagonism. What is it?
  21. Antagonism Problems in Peanuts
  22. Get the most from your Posts!



SLIDE CONTENTS
  1. GET THE MOST FROM YOUR POSTS (Improving POST Herbicide Performance) Dr. Eric P. Prostko Extension Weed Specialist University of Georgia Tifton
  2. POST Herbicide Performance Environment X Application moisture temperature humidity calibration timing adjuvants nozzle selection spray volume antagonism
  3. Topic for Discussion calibration timing adjuvants nozzle selection spray volume antagonism
  4. 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) Have you calibrated yours lately!!!!
  5. Topic for Discussion calibration timing adjuvants nozzle selection spray volume antagonism
  6. Postemergence Herbicide Applications and Weed Size smaller weeds easier to control lower rates can be used reduce competitive effects of weeds Timing is everything and size matters!!! Why???
  7. Optimum Timing of POST Applications definitely probably No way!!!
  8. A Few Exceptions to the Rule Controlling Bigger Weeds Delayed applications result in competition and yield loss !!!!!!
  9. Topic for Discussion calibration timing adjuvants nozzle selection spray volume antagonism
  10. Herbicide Adjuvants Types non-ionic surfactants (NIS) organosilicone surfactants crop oil concentrates (COC) fertilizers (N) buffers compatibility agents drift reduction agents stickers
  11. Herbicide Adjuvants What do they do?? modify or maximize performance increase absorption and retention * decrease surface tension of water * prevent interaction with Ca, Na * increase permeability of cell membrane and cuticle
  12. The influence of additives on sicklepod control with Cadre - 68 DAT A. S. Culpepper, 1999 LSD 0.05 = 5 (MSO + OSS) (NIS)
  13. Herbicide Adjuvants read label COC > NIS avoid “miracle” products
  14. Topic for Discussion calibration timing adjuvants nozzle selection spray volume antagonism
  15. Nozzle Selection (contact or systemic herbicide?) contact * Gramoxone Max, Basagran, Blazer, Storm, Tough systemic * Cadre, Pursuit, Select, Poast, 2,4-DB, Classic
  16. PPT Slide
  17. Topic for Discussion calibration timing adjuvants nozzle selection spray volume antagonism
  18. Spray Volume contact or systemic contacts need better coverage i.e. more water contact herbicides need to be applied in at least 15 GPA systemic herbicides can be applied in 10 GPA but would prefer 15 GPA
  19. Topic for Discussion calibration timing adjuvants nozzle selection spray volume antagonism
  20. Antagonism What is it? interaction of 2 or more chemicals that results in a decrease in plant response.
  21. Antagonism Problems in Peanuts Broadleaf + grass herbicides * 2,4-DB + Poast or Select * 8-15% reduction in grass control 45% of time Herbicide + Fungicides * Select + chlorothalonil * Herbicides + Kocide or Mankocide
  22. Get the most from your Posts! Can’t do much about the weather but Can greatly influence application * calibration * timing * adjuvants * nozzle selection * spray volume * antagonism