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Role of Temperature, Plant Age, and Fungus Isolate in the Development of Brown Stem Rot in Soybeans. L. E. Gray, Research Plant Pathologist, Agriculture Research Service, U.S. Department of Agriculture, University of Illinois, Urbana 61801; Phytopathology 64:94-96. Accepted for publication 20 July 1973. DOI: 10.1094/Phyto-64-94.

Temp and plant age were not limiting factors preventing leaf symptoms in soybean plants inoculated with a defoliating isolate of Cephalosporium gregatum. Soybean plants inoculated with this isolate of the fungus were defoliated at 22 and 28 C. Only the defoliating isolate produced characteristic leaf symptoms on plants inoculated in the field.

Additional keywords: Glycine max.