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Weed Management in Peanut (Arachis hypogaea) with Imazethapyr and Metolachlor

Published online by Cambridge University Press:  12 June 2017

John S. Richburg III ,
John W. Wilcut  and
E. Ford Eastin
John S. Richburg III
Affiliation:
Dep. Crop and Soil Sciences, Box 748, Univ. Georgia, Coastal Plain Exp. Stn., Tifton, GA 31793-0748
John W. Wilcut
Affiliation:
Dep. Crop and Soil Sciences, Box 748, Univ. Georgia, Coastal Plain Exp. Stn., Tifton, GA 31793-0748
E. Ford Eastin
Affiliation:
Dep. Crop and Soil Sciences, Box 748, Univ. Georgia, Coastal Plain Exp. Stn., Tifton, GA 31793-0748
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Abstract

Field studies at three sites in Georgia evaluated broadleaf weed and nutsedge management in peanut with PPI applications of imazethapyr and metolachlor and POST applications of paraquat in mixture with imazethapyr or bentazon. Imazethapyr at 36 g ai/ha applied PPI alone or in mixture with metolachlor at 2750 g ai/ha controlled coffee senna; entireleaf, ivyleaf, pitted, smallflower, and tall morningglories; bristly starbur; and prickly sida better than metolachlor applied PPI. Yellow nutsedge control was generally higher where metolachlor was applied PPI. Postemergence control of the aforementioned species and sicklepod was similar with paraquat plus imazethapyr and paraquat plus bentazon. Peanut yields with paraquat plus imazethapyr and paraquat plus bentazon were similar. With one exception, peanut yields from imazethapyr PPI systems were higher than metolachlor PPI systems when POST herbicides were not used. Inclusion of metolachlor with PPI application of imazethapyr increased yields only at one location.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxideimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidmetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamideparaquat 1,1′-dimethyl-4,4′-bipyridinium ionbristly starbur, Acanthospermum hispidum DC., # ACNHIcoffee senna, Cassia occidentalis L., # CASOCentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHGivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHEpitted morningglory, Ipomoea lacunosa (L.) Jacq. # IPOLAprickly sida, Sida spinosa L., # SIDSPsicklepod, Senna obtusifolia (L.) Irwin and Barneby # CASOBsmallflower morningglory, Jacquemontia tamnifolia (L.) Griseb. # IAQTAtall morningglory, Ipomoea purpurea (L.) Roth. # PHBPUyellow nutsedge, Cyperus esculentus L. # CYPESpeanut, Arachis hypogaea L. ‘Florunner,’ ‘Southern runner.’Bentazonparaquatbroadleaf weedsCYPES
Type
Research
Information
Weed Technology , Volume 9 , Issue 4 , December 1995 , pp. 807 - 812
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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