Increased Incidence ofPhomopsissp. in Seeds from Soybeans Infected with Bean Pod Mottle Virus

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Abstract
The incidence of Phomopsis sp. in soybean (G. max) seeds increased as much as 5-fold, depending on the cultivar, in plants inoculated with bean pod mottle virus and compared with uninoculated control plants. Soybean mosaic virus and bean yellow mosaic virus had little or no effect on seed infection by Phomopsis sp. Infections with beanpod mottle virus and soybean mosaic virus, regardless of inoculation sequence, increased seed infection by Phomopsis to levels equal to or significantly greater than infection with bean pod mottle virus alone. Seed infection by Cercospora kikuchii was much lower than that by Phomopsis sp. and apparently was not influenced by virus infection. Yields from plants infected with both bean pod mottle virus and soybean mosaic virus ranged 35-43% of controls in soybean cultivars susceptible to these 2 viruses. Soybean fields with a high incidence of bean pod mottle virus are more likely to have high levels of Phomopsis sp. seed infection and should not be saved for planting.

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