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Weed Hosts for Rhizoctonia solani, Causal Agent for Rhizoctonia Foliar Blight of Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

B. David Black ,
James L. Griffin ,
John S. Russin  and
Johnnie P. Snow
B. David Black
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
John S. Russin
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

Greenhouse studies were conducted to determine host status of weed species for Rhizoctonia solani AG-1, which causes Rhizoctonia foliar blight of soybean. Weed species were barnyardgrass, broadleaf signalgrass, common cocklebur, entireleaf morningglory, hemp sesbania, itchgrass, johnsongrass, large crabgrass, northern jointvetch, prickly sida, purple nutsedge, redweed, sicklepod, and smooth pigweed. Seedling weeds were inoculated with suspensions containing intraspecific group IA and IB isolates of the fungus. In the first study, sclerotia of IA were recovered from tissue of all weeds except smooth pigweed, and mycelia of IA were recovered from all except smooth pigweed and redweed. In that study, neither microsclerotia nor mycelia of IB were recovered from sicklepod, barnyardgrass, or large crabgrass, and only microsclerotia were recovered from itchgrass and purple nutsedge. In the second study, sclerotia of IA, microsclerotia of IB, and mycelia of each isolate were recovered from all weed species. In other studies, R. solani spread from at least six of seven weed species to a noninfected soybean plant growing in close proximity. These studies emphasize the importance of weed control, not only for reducing plant competition and increasing yield, but also for the potential impact on development of RFB.

Keywords

Rhizoctonia solani Kühn AG-1 IARhizoctonia solani Kühn AG-1 IBbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGcommon cocklebur, Xanthium strumarium L. # XANSTjohnsongrass, Sorghum halepense L. Pers. # SORHAlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAprickly sida, Sida spinosa L. # SIDSPpurple nutsedge, Cyperus rotundus L. # CYPROredweed, Melochia corchorifolia L. # MEOCOsicklepod. Senna obtusifolia L. # CASOBand smooth pigweed, Amaranthus hybridus L. # AMACHsoybean, Glycine max (L.) Merr.Aerial blightdiseaseweb blightweed-disease interactionAeschynomene virginicaAmaranthus hybridusBrachiaria platyphyllaCyperus rotundusDigitaria sanguinalisAESVIAMACHBRAPPCASOBCYPRODIGSAECHCGIPOHGMEOCOROOEXSEBEXSIDSPSORHAXANST
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 865 - 869
Copyright
Copyright © 1996 by the Weed Science Society of America 

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