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%

16.2

2.37.2

68

0

20

40

60

80

w. poinsettia Fla.Beggarweed

bristlystarbur

sicklepod y. nutsedge

Source: W. C. Johnson, 2001

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

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 toweed 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)

Herbicide Rate/A Timing Cost/A

Sonalan 2 pts PRE 5.66

Valor 3 ozs PRE 15.00

Cadre 1.0 ozs POST 12.00

Crop Oil 1% v/v POST 1.62

Total 34.28

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

Herbicide Rate/A Timing Cost/A

Pendimax 2.4 pts PRE 4.65

Strongarm 0.45 ozs PRE 18.00

Cadre 1.00 ozs POST 12.00

Crop Oil 1% v/v POST 1.62

Total 36.27

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

Herbicide Rate/A Timing Cost/ASonalan 2 pts PPI/PRE 5.66

Boa 6.4 ozs CRACK 1.45NIS 0.25% v/v CRACK 0.67

Cadre 1.00 ozs POST 12.00Crop Oil

Total

1% v/v POST 1.62

21.40

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

Herbicide Rate/A Timing Cost/ASonalan 2 pts PPI/PRE 5.66

Boa 6.4 ozs CRACK 1.45Storm 1.5 pt CRACK 12.75NIS 0.25% v/v CRACK 0.67

Cadre 1.00 ozs POST 12.00Crop Oil

Total

1% v/v POST 1.62

34.15

?Questions