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Total Postemergence Weed Control in Imidazolinone-Resistant Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Ronald F. Krausz  and
George Kapusta
Ronald F. Krausz
Affiliation:
Department of Plant and Soil Science, Southern Illinois University, Carbondale, IL 62901
George Kapusta
Affiliation:
Department of Plant and Soil Science, Southern Illinois University, Carbondale, IL 62901
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Abstract

Field experiments were conducted in 1994 and 1995 to evaluate weed control in imidazolinone-resistant corn with postemergence applications of imidazolinone and sulfonylurea herbicides. Imazethapyr controlled 100% of redroot pigweed, jimsonweed, and eastern black nightshade. Control of fall panicum with imazethapyr was inconsistent, with control ranging from 42 to 85%. Imazethapyr provided less than 55% control of common lambsquarters and 43% of large crabgrass. Imazethapyr plus either atrazine, 2,4-D, or dicamba increased control of common lambsquarters compared to imazethapyr alone. Fall panicum control was > 95% with nicosufluron. CGA-152005 and MON 12000 did not control eastern black nightshade. In 1995, corn yield was greater with the hand-weeded check compared to all herbicide treatments. The greatest return over herbicide cost with imazethapyr was obtained with imazethapyr plus atrazine. Nicosulfuron plus CGA-152005 provided the greatest return over herbicide cost when averaged across years.

Keywords

dicamba, 3,6-dichloro-2-methoxybenzoic acid2,4-D, (2,4-dichlorophenoxy)acetic acidcommon lambsquarters, Chenopodium album L. # CHEALeastern black nightshade, Solanum ptycanthum Dun # SOLPTfall panicum, Panicum dichotomiflorum # PANDI Michxjimsonweed, Datura stramonium L. # DATSTlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAredroot pigweed, Amaranthus retroflexus L. # AMAREcorn, Zea mays L. ‘Pioneer 3245IR.’Postemergence herbicidesAmaranthus retroflexusChenopodium albumDatura stramoniumDigitaria sanguinalisPanicum dichotomiflorumSolanum ptycanthumAMARECHEALDATSTDIGSAPANDISOLPTALS, acetolactate synthaseIR, imidazolinone-resistant
Type
Research
Information
Weed Technology , Volume 12 , Issue 1 , March 1998 , pp. 151 - 156
Copyright
Copyright © 1997 by the Weed Science Society of America 

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