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Adjusting Herbicide Programs to Emerging Weed Problems in Peanut. Eric P. Prostko Extension Weed Specialist University of Georgia. Why do “new” weed problems occur?. reliance on herbicides decreases in cultivation ecological shifts herbicide resistance.

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Adjusting herbicide programs to emerging weed problems in peanut

Adjusting Herbicide Programs to Emerging Weed Problems in Peanut

Eric P. Prostko

Extension Weed Specialist

University of Georgia


Why do new weed problems occur
Why do “new” weed problems occur?

  • reliance on herbicides

  • decreases in cultivation

  • ecological shifts

  • herbicide resistance


New or unique weed problems in peanuts
New or Unique Weed Problems in Peanuts

  • tropic croton

  • dayflower/spider-wort

  • eclipta

  • copperleaf

  • spiderflower

  • redweed

  • ALS-resistant pigweed


Tropic croton croton glandulosus
Tropic Croton (Croton glandulosus)

  • 3rd most troublesome weed

  • Cadre is weak

  • not as competitive as other weeds

  • PRE - Valor or Strongarm

  • POST - Ultra Blazer

  • Cadre/Blazer tank/mixes???


Dayflower spiderwort commelina spp
Dayflower/Spiderwort (Commelina spp.)

Asiatic

  • Berrien, Brooks, Grady, Thomas

  • limited data

  • Roundup is weak

  • PRE - Dual (timing)

  • POST - Basagran

  • others????

spreading

spiderwort



Residual spiderwort control in peanuts with dual magnum brooks county ga

8

7.6

6

Plants/ft2

4

2

2.2

0

Dual

No Dual

Residual Spiderwort Control in Peanuts with Dual Magnum, Brooks County, GA

a

b

Dual Magnum @ 1 pt/A Applied: July 2, 2001 Rated: August 1, 2001


Eclipta eclipta prostrata
Eclipta (Eclipta prostrata)

  • low, moist areas

  • limited biology data

  • PRE - Strongarm, Valor, Dual, Outlook

  • POST - Basagran, Storm, Tough

  • timing is critical


Eclipta control in peanuts with post herbicides

100

80

60

2" or less

Control (%)

3-5"

40

20

0

Storm

Cadre

Blazer

Tough

2,4-DB

Basagran

Herbicide

Eclipta Control in Peanuts with POST Herbicides

Grichar, 1997


Hophornbeam copperleaf acalypha ostryifolia
Hophornbeam Copperleaf (Acalypha ostryifolia)

  • Randolph, Terrell

  • limited biology data

  • PRE - Valor or Strongarm

  • POST - Ultra Blazer, Storm


Hophornbeam copperleaf control randolph county ga 2001
Hophornbeam Copperleaf ControlRandolph County, GA - 2001

Untreated

Strongarm

Valor

6 WAT


Spiderflower cleome spp
Spiderflower (Cleome spp.)

  • Laurens County

  • limited data

  • PRE - Pursuit

  • POST - Pursuit, Cadre, Ultra Blazer (bloom stage)


Redweed melochia corchorifolia
Redweed (Melochia corchorifolia)

  • low, moist areas

  • hard seed coat

  • season long germination

  • PRE - Strongarm, Valor, Zorial

  • POST - Basagran, Storm, Cadre


Als resistant palmer pigweed
ALS-Resistant Palmer Pigweed

  • Burke County

  • 2001

  • do not use Cadre, Pursuit, Classic, Strongarm

  • Prowl, Sonalan, Dual, Valor, Ultra Blazer, Storm


Summary
Summary

  • Newer soil applied herbicides will help control some of the unique weed problems.

  • Combinations of PRE and POST treatments will provide consistent control.

  • Need more information about biology and competitiveness of newer weed problems in order to make better control decisions.


Adjusting herbicide programs to emerging weed problems in peanut

University of

Georgia

Extension

Weed Science

(gaweed.com)