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Adjusting Herbicide Programs to Emerging Weed Problems in Peanut Eric P. Prostko Extension Weed Specialist University of Georgia.

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Presentation on theme: "Adjusting Herbicide Programs to Emerging Weed Problems in Peanut Eric P. Prostko Extension Weed Specialist University of Georgia."— Presentation transcript:

1 Adjusting Herbicide Programs to Emerging Weed Problems in Peanut Eric P. Prostko Extension Weed Specialist University of Georgia

2 Why do “new” weed problems occur? H reliance on herbicides H decreases in cultivation H ecological shifts H herbicide resistance

3 New or Unique Weed Problems in Peanuts H tropic croton H dayflower/spider- wort H eclipta H copperleaf H spiderflower H redweed H ALS-resistant pigweed

4 Tropic Croton (Croton glandulosus) H 3rd most troublesome weed H Cadre is weak H not as competitive as other weeds H PRE - Valor or Strongarm H POST - Ultra Blazer H Cadre/Blazer tank/mixes???

5 Dayflower/Spiderwort (Commelina spp.) H Berrien, Brooks, Grady, Thomas H limited data H Roundup is weak H PRE - Dual (timing) H POST - Basagran H others???? Asiatic spreading spiderwort

6 Tropical spiderwort, Cairo, GA, 2001

7 Residual Spiderwort Control in Peanuts with Dual Magnum, Brooks County, GA Residual Spiderwort Control in Peanuts with Dual Magnum, Brooks County, GA DualNo Dual Plants/ft2 Dual 1 pt/A Applied: July 2, 2001 Rated: August 1, 2001 b a

8 Eclipta (Eclipta prostrata) H low, moist areas H limited biology data H PRE - Strongarm, Valor, Dual, Outlook H POST - Basagran, Storm, Tough H timing is critical

9 Eclipta Control in Peanuts with POST Herbicides Cadre Blazer Storm Basagran Tough 2,4-DB Herbicide Control (%) 2" or less 3-5" Grichar, 1997

10 Hophornbeam Copperleaf (Acalypha ostryifolia) H Randolph, Terrell H limited biology data H PRE - Valor or Strongarm H POST - Ultra Blazer, Storm

11 Hophornbeam Copperleaf Control Randolph County, GA WAT UntreatedStrongarm Valor

12 Spiderflower (Cleome spp.) H Laurens County H limited data H PRE - Pursuit H POST - Pursuit, Cadre, Ultra Blazer (bloom stage)

13 Redweed (Melochia corchorifolia) H low, moist areas H hard seed coat H season long germination H PRE - Strongarm, Valor, Zorial H POST - Basagran, Storm, Cadre

14 ALS-Resistant Palmer Pigweed H Burke County H 2001 H do not use Cadre, Pursuit, Classic, Strongarm H Prowl, Sonalan, Dual, Valor, Ultra Blazer, Storm

15 Summary H Newer soil applied herbicides will help control some of the unique weed problems. H Combinations of PRE and POST treatments will provide consistent control. H Need more information about biology and competitiveness of newer weed problems in order to make better control decisions.

16 University of Georgia Extension Weed Science (gaweed.com)


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