Types of Rhizoctonia foliar blight on soybean in Louisiana

Reference Report for IND90033520

Title:	Types of Rhizoctonia foliar blight on soybean in Louisiana
Authors:	Yang, X.B., Berggeren, G.T., Snow, J.P.
Source:	Plant Dis. 1990, 74(7):501-504
Abstract:	During 1987-88, 20 locations in southern and central Louisiana, USA, were surveyed to determine the aetiology of R. foliar blights of soyabean. Web blight caused by R. solani anastomosis group 1, intraspecific group IB (AG-1B) was the major type in Louisiana in both years. Aerial blight caused by isolates of R. solani AG-1 IA, previously considered the only type in the state, was also found. No isolate of AG-1 IC was found. Isolates of AG-1 IA and AG-1 IB could be differentiated on the basis of cultural characteristics on water agar and potato-dextrose agar. Max. production of microsclerotia in the field occurred from late Jul. to Aug. Low numbers of microsclerotia produced by R. solani AG-1 IB were observed on plants at earlier and later soyabean growth stages. Thanatephorus cucumeris, the teleomorph of the pathogen, was also observed during late Jul. and Aug.

Funded by the USDA-ARS. Developed by the USDA-ARS SoyBase and Legume Clade Database group at the Iowa State University, Ames, IA

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