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Herbicide Effects on Rhizoctonia solani in Vitro and Rhizoctonia Foliar Blight of Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

B. David Black ,
John S. Russin ,
James L. Griffin  and
Johnnie P. Snow
B. David Black
Affiliation:
Dep. of Plant Pathol, and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
John S. Russin
Affiliation:
Dep. of Plant Pathol, and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
James L. Griffin
Affiliation:
Dep. of Plant Pathol, and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
Johnnie P. Snow
Affiliation:
Dep. of Plant Pathol, and Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
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Abstract

Acifluorfen, alachlor, glufosinate, glyphosate, paraquat, and pendimethalin were evaluated for their effects on mycelial growth and sclerotia/microsclerotia production by Rhizoctonia solani AG-1 IA and IB in culture. All of these herbicides except glufosinate and glyphosate were evaluated for effects on severity of Rhizoctonia foliar blight of soybean in the field. In laboratory studies, all herbicides reduced colony radius of R. solani. Growth reductions for IB were greater than for IA in the presence of pendimethalin, alachlor, and acifluorfen, but glufosinate reduced growth of IA more than IB. Sclerotia production by both isolates was prevented by paraquat, greatly reduced by glufosinate, but markedly less affected by the other herbicides tested. In field studies, all tested herbicides influenced severity of Rhizoctonia foliar blight when disease pressure was low, but only paraquat reduced severity when disease pressure was high.

Keywords

Rhizoctonia foliar blight, Rhizoctonia solani Kühn AG-1 IA and IBacifluorfen, [5-(2-chloro-4-(trifluoromethyl)phenoxy)-2-nitrobenzoic acid]alachlor, [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide]glufosinate, [2-amino-4-(hydroxymethylphosphinyl)butanoic acid]glyphosate, [N-(phosphonomethyl) glycine]paraquat, [1,1′'-dimethyl-4,4′-bipyridinium ion]pendimethalin, [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine]soybean, Glycine max(L.) Merr. ‘Davis.’Aerial blightepidemiologyfungusplant disease
Type
Special Topics
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 711 - 716
Copyright
Copyright © 1996 by the Weed Science Society of America 

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