Epidemiology of soybean seed decay by Phomopsis and Diaporthe spp.

Reference Report for IND84099064

Title:	Epidemiology of soybean seed decay by Phomopsis and Diaporthe spp.
Authors:	McGee, D.C.
Source:	Seed. Sci. Technol. 1983, 11(3):719-729
Abstract:	Phomopsis seed decay of soybeans is caused by a complex of fungi including Diaporthe phaseolorum var. sojae and an unnamed Phomopsis sp., the causal agents of pod and stem blight, and Diaporthe phaseolorum var. caulivora , the cause of stem canker. The disease causes serious losses in soybean seed production throughout the world by reducing seed germination and vigour. Soybean crop residues are a more important inoculum source than seeds in established soybean production areas. It is not known how inoculum is transmitted from crop residues to plants or how infection is spread throughout the plants. Pods, however, are a pathway for seed infection. Pod infection can occur at any time after flowing, but significant seed infection will not occur unless prolonged periods of wet weather occur after physiological maturity of the plants.

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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