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Weed Management in Imidazolinone-Resistant Corn with Imazapic

Published online by Cambridge University Press:  20 January 2017

Joyce Tredaway Ducar ,
John W. Wilcut  and
John S. Richburg III
Joyce Tredaway Ducar*
Affiliation:
Department of Animal and Plant Sciences, P.O. Box 5003, Berry College, Mt. Berry, GA 30149
John W. Wilcut
Affiliation:
Department of Crop and Soil Sciences, Coastal Plain Experiment Station, University of Georgia, Tifton, GA 31794
John S. Richburg III
Affiliation:
Department of Crop and Soil Sciences, Coastal Plain Experiment Station, University of Georgia, Tifton, GA 31794
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted in 1992 and 1993 to evaluate imazapic alone and in postemergence (POST) mixtures with atrazine or bentazon for weed control in imidazolinone-resistant corn treated with carbofuran. Nicosulfuron and nicosulfuron plus atrazine also were evaluated. Imazapic at 36 and 72 g ai/ha controlled large crabgrass 85 and 92%, respectively, which was equivalent to control obtained with nicosulfuron plus atrazine. Imazapic at the higher rate controlled large crabgrass better than nicosulfuron alone. Imazapic at 36 and 72 g/ha controlled Texas panicum 88 and 99%, respectively, and at the higher rate control was equivalent to that obtained with nicosulfuron alone or in mixture with atrazine. Imazapic plus bentazon POST controlled Texas panicum less than imazapic at the lower rate applied alone. Redroot pigweed was controlled 100% with all herbicide treatments. Imazapic at either rate alone or in tank mixture with bentazon or atrazine controlled prickly sida >99%, which was superior to control obtained with nicosulfuron or nicosulfuron plus atrazine. Smallflower, entireleaf, ivyleaf, pitted, and tall morningglories were controlled 96% or greater with all herbicide treatments except nicosulfuron alone. Sicklepod control was >88% with all imazapic treatments, whereas control from nicosulfuron alone was 72%. Corn yields were improved by the addition of POST herbicides with no differences among POST herbicide treatments.

Keywords

Atrazinebentazoncarbofuran, 2,3-dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamateimazapicnicosulfuronentireleaf morningglory, Ipomoea hederacea var. integriuscula Grayivyleaf morningglory, Ipomoea hederacea (L.) Jacq. #3 IPOHElarge crabgrass, Digitaria sanguinalis L. # DIGSApitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPredroot pigweed, Amaranthus retroflexus L. # AMAREsicklepod, Senna obtusifolia Irwin and Barneby (L.) # CASOBsmallflower morningglory, Jacquemontia tamnifolia Griseb. # IAQTAtall morningglory, Ipomoea purpurea (L.) Roth. # PHBPUTexas panicum, Panicum texanum Buckl. # PANTEcorn, Zea mays L. ‘Pioneer 3343IR’Imidazolinone-resistant cornALS, acetolactate synthase (EC 4.1.3.18)IR, imidazolinone resistantPOST, postemergence.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 1018 - 1022
Copyright
Copyright © Weed Science Society of America 

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