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Adjusting Herbicide Programs to Emerging Weed Problems in Peanut
AUTHOR
Dr. Eric P. Prostko
Extension Weed Specialist
University of Georgia
Tifton, GA
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TABLE OF CONTENTS
Adjusting Herbicide Programs to Emerging Weed Problems in Peanut
Why do "new" weed problems occur?
New or Unique Weed Problems in Peanuts
Tropic Croton (Croton glandulosus)
Dayflower/Spiderwort (Commelina spp.)
Tropical spiderwort
Residual Spiderwort Control in Peanuts with Dual Magnum, Brooks County, GA
Eclipta (Eclipta prostrata)
Eclipta Control in Peanuts with POST Herbicides
Hophornbeam Copperleaf (Acalypha ostryifolia)
Hophornbeam Copperleaf Control: Randolph County, GA - 2001
Spiderflower (Cleome spp.)
Redweed (Melochia corchorifolia)
ALS-Resistant Palmer Pigweed
Summary
UGA Extension Weed Science
SLIDE CONTENTS
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.) Berrien, Brooks, Grady, Thomas limited data Roundup is weak PRE - Dual (timing) POST - Basagran others???? Asiatic spreading spiderwort
Tropical spiderwort, Cairo, GA, 2001
Residual Spiderwort Control in Peanuts with Dual Magnum, Brooks County, GA Dual Magnum @ 1 pt/A Applied: July 2, 2001 Rated: August 1, 2001 b a
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 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 6 WAT Untreated Strongarm Valor
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)