Interaction of Fusarium Wilt and Nematodes in Cobb Soybean. Donald R. Sumner, Professor of Plant Pathology, Department of Plant Pathology, ARS-USDA, Coastal Plain Experiment Station, Tifton, GA 31793-0748. Norman A. Minton, Research Nematologist, Department of Plant Pathology, ARS-USDA, Coastal Plain Experiment Station, Tifton, GA 31793-0748. Plant Dis. 71:20-23. Accepted for publication 10 September 1986. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1987. DOI: 10.1094/PD-71-0020.

A host differential greenhouse study showed that Fusarium wilt of Cobb soybean was caused by Fusarium oxysporum f. sp. tracheiphilum race 1. In experiments with three field soils, internal gray to black stem discoloration in Cobb was most severe in soils infested with F. o. f. sp. tracheiphilum race 1, Belonolaimus longicaudatus, and Pratylenchus brachyurus. Wounding roots with a knife 18-20 days after planting did not increase wilt or internal stem discoloration.