Why Are Some Herbicides Not Recommended By UGA? Eric P. Prostko and A. Stanley Culpepper Professors/Extension Weed Specialists Dept. Crop & Soil Sciences.

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Presentation transcript:

Why Are Some Herbicides Not Recommended By UGA? Eric P. Prostko and A. Stanley Culpepper Professors/Extension Weed Specialists Dept. Crop & Soil Sciences

U.S. Crop Production – 2015 Acres Planted (X 1000) Source: NASS - Crop Production (November 2015)

Cotton vs. Soybean in SE 1,275,000 acres harvested in % of US Total 1,720,000 acres harvested in % of US Total Source: USDA/NASS, Crop Production (November 2015)

Herbicide Advertisements Progressive Farmer - November 2015

Herbicides You Might Not Be Too Familiar With

Reasons for Not Recommending u limited data – would prefer 2-3 years of data –43 peanut trials with pyroxasulfone (Zidua) u crop injury u carryover u weed efficacy –Texas panicum u cost/A u any better than current standards?

PRE Applied Balance Flexx Injury on Field Corn CN April 6 11 DAT

Peanut Injury with Anthem Flex 4SE – 22 DAT NTC 3.0 oz/A 3.75 oz/A 6.0 oz/A 7.5 oz/A PE May 19

Peanut Yield Response to PRE Applications of Anthem Flex PE Weed-free LSD 0.10 = 906 CV = Anthem Flex 4SE = pyroxasulfone (3.733 lbs) + carfentrazone (0.267 lbs)

Cadre vs. Flame in Peanut u imazapic u Cadre - US u Flame – Australia u Flame registered for PRE/POST us in peanut u Cadre Registered for POST use only uWHY?? –Increased rotational crop issues (i.e. cotton) – less control of Florida beggarweed

Soil Types Southeast vs. Midwest Ponder Farm - UGA South Charleston, OH Concord, NB Ames, IA Soil Texture Class loamy sandsilty clay loam clay loam % OM CEC (meq/100 g) Sand (%) Silt (%) Clay (%)

Midwest Weed Control Programs Soybeans PPLNTPREPOST1POST2 Valor XLT + 2,4-D + Glyphosate Glyphosate + FlexstarGlyphosate Canopy + Sencor + 2,4-D + Glyphosate Glyphosate + CobraGlyphosate Glyphosate + Sharpen Glyphosate + WarrantGlyphosate + Cobra Field Corn PREPOST Lumax or Lexar (2/3 rd rate)Glyphosate + Distinct, Impact, or Laudis Corvus or Verdict + atrazineRoundup or Liberty Atrazine premix (2/3 rd rate)Glyphosate + Distinct, Impact, or Laudis, Halex GT Source: Dr. Bill Johnson, Purdue University (11/12/2015)

Bottom Line u usually a very good reason why herbicides are not recommended by UGA or listed in Pest Control Handbook u do not assume a label in another state/country will work in GA!