How do we manage weeds in $355/ton peanuts??? Eric P. Prostko Extension Weed Specialist University of Georgia Tifton

Do not forget the basics! u read label u calibrate sprayer u use a DNA u be more timely u understand weed competition

Weed Competition u 100% weed control is not practical u 1 st 4-6 weeks most important u later emerging weeds usually do not cause yield losses (harvest problems) u all weeds are not created equal u grasses more competitive than broadleaves

Weeds/m 2 Required to Reduce Peanut Yields by 25% Source: W. C. Johnson, 2001

HADSS Herbicide Application Decision Support System u Web-based version is free u Can be purchased for $95 u Database needs to be updated for SE u time input for scouting and data entry u

Herbicide Incorporation or * equally as effective * center-pivot irrigation (0.75’’) is $3-7/A cheaper! mechanicalirrigation

Consider Using Paraquat u less than $2.00/A u if not using Valor or Strongarm u if beggarweed, sicklepod and t. panicum are main problems u apply early

Consider Using Cadre u 50% price reductions in 2002 u controls most weeds except ragweed, croton, bristly starbur u Is it worth the rotational crop risk?? u Use following paraquat, or Valor, or Strongarm

Get the most from your Posts! u can’t do much about the weather but u can greatly influence application * calibration * timing * adjuvants * nozzle selection * spray volume * antagonism

If you cannot use Cadre…... u weed control costs will probably be higher u Dual Magnum ($10-14/A) but not as effective. u Older herbicides (Basagran, Blazer, Storm) effective but have some weaknesses

What about dryland peanuts? u less reliable u pray for rain u still use DNA u monitor weather u if dry, do not use anything else except POSTS u be ready to go when weeds are 2”

Reduced Rates Do they work???

Reduced rates can work if…….. u The weed is susceptible u good growing/application conditions exist u 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? u regularly calibrates his sprayer u has irrigation or can predict when it will rain u gets consistent weed control at full rates u understands the difference between 2” and 4” u can cover his acreage in a short time period u is willing to scout his field regularly u is willing to accept less than 100% weed control u is not a lawyer or close friends with one A grower who ……...

$25-30/A Peanut Weed Control Systems? (15 GAP, not including application)

? Questions