Fusarium Wilt of Soybean in Delaware. N. P. Ferrant, Graduate Assistant, Department of Plant Science, University of Delaware, Newark 19711. R. B. Carroll, Associate Professor of Plant Pathology, Department of Plant Science, University of Delaware, Newark 19711. Plant Dis. 65:596-599. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-596.

In 1976 and 1977, significant yield losses occurred in southern Delaware soybean fields. The major symptom was wilting of plants at different stages of development, and the pathogen was identified as Fusarium oxysporum. Isolations were made periodically from diseased plants and their rhizospheres collected from experimental plots established in a heavily infested field. F. oxysporum represented 84% of pathogens isolated from roots and stems. From soil, Fusarium species comprised 86%. F. oxysporum was isolated from the surface of 41% of the seed harvested and tested.