Adjusting herbicide programs to emerging weed problems in peanut
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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

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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


New or Unique Weed Problems in Peanuts

  • tropic croton

  • dayflower/spider-wort

  • eclipta

  • copperleaf

  • spiderflower

  • redweed

  • ALS-resistant pigweed


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.)

Asiatic

  • Berrien, Brooks, Grady, Thomas

  • limited data

  • Roundup is weak

  • PRE - Dual (timing)

  • POST - Basagran

  • others????

spreading

spiderwort


Tropical spiderwort, Cairo, GA, 2001


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)

  • low, moist areas

  • limited biology data

  • PRE - Strongarm, Valor, Dual, Outlook

  • POST - Basagran, Storm, Tough

  • timing is critical


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)

  • Randolph, Terrell

  • limited biology data

  • PRE - Valor or Strongarm

  • POST - Ultra Blazer, Storm


Hophornbeam Copperleaf ControlRandolph County, GA - 2001

Untreated

Strongarm

Valor

6 WAT


Spiderflower (Cleome spp.)

  • Laurens County

  • limited data

  • PRE - Pursuit

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


Redweed (Melochia corchorifolia)

  • low, moist areas

  • hard seed coat

  • season long germination

  • PRE - Strongarm, Valor, Zorial

  • POST - Basagran, Storm, Cadre


ALS-Resistant Palmer Pigweed

  • Burke County

  • 2001

  • do not use Cadre, Pursuit, Classic, Strongarm

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


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.


University of

Georgia

Extension

Weed Science

(gaweed.com)


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