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How do we manage weeds in $355/ton peanuts?

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

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TABLE OF CONTENTS

How do we manage weeds in $355/ton peanuts??? Do not forget the basics! Weed Competition Weeds/m2 Required to Reduce Peanut Yields by 25% HADSS: Herbicide Application Decision Support System Herbicide Incorporation Consider Using Paraquat Consider Using Cadre Get the most from your Posts! If you cannot use Cadre ... What about dryland peanuts? Reduced Rates: Do they work??? Reduced rates can work if ... What kind of grower might consider using reduced rates? $25-30/A Peanut Weed Control Systems? $25-30/A Peanut Weed Control Systems? $25-30/A Peanut Weed Control Systems? $25-30/A Peanut Weed Control Systems? Questions?

SLIDE CONTENTS

How do we manage weeds in $355/ton peanuts??? Eric P. Prostko Extension Weed Specialist University of Georgia Tifton Do not forget the basics! read label calibrate sprayer use a DNA be more timely understand weed competition Weed Competition 100% weed control is not practical 1st 4-6 weeks most important later emerging weeds usually do not cause yield losses (harvest problems) all weeds are not created equal grasses more competitive than broadleaves Weeds/m2 Required to Reduce Peanut Yields by 25% Source: W. C. Johnson, 2001 HADSSHerbicide 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 Herbicide Incorporation or * equally as effective * center-pivot irrigation (0.75’’) is $3-7/A cheaper! mechanical irrigation Consider Using Paraquat less than $2.00/A if not using Valor or Strongarm if beggarweed, sicklepod and t. panicum are main problems apply early Consider Using Cadre 50% price reductions in 2002 controls most weeds except ragweed, croton, bristly starbur Is it worth the rotational crop risk?? Use following paraquat, or Valor, or Strongarm 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 If you cannot use Cadre…... weed control costs will probably be higher Dual Magnum ($10-14/A) but not as effective. Older herbicides (Basagran, Blazer, Storm) effective but have some weaknesses What about dryland peanuts? less reliable pray for rain still use DNA monitor weather if dry, do not use anything else except POSTS be ready to go when weeds are 2” Reduced RatesDo they work??? 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. 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 ……... $25-30/A Peanut Weed Control Systems?(15 GAP, not including application) $25-30/A Peanut Weed Control Systems? (15 GAP, not including application) $25-30/A Peanut Weed Control Systems? (15 GAP, not including application) $25-30/A Peanut Weed Control Systems? (15 GAP, not including application) ? Questions