Factors Associated with the Epidemiology of Soybean Mosaic Virus in Iowa

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Abstract
Soybean (Glycine max) [cv. Harcor] grown under fully screened cages, half-screened cages, or without cages were rated for infection with soybean mosaic virus (SMV) by local-lesion indexing and by the presence of seed-coat mottling on seeds harvested from the mother plants. Infected plants were detected in the half-screened cages and uncaged treatments, but were rare in the fully screened cages. Seed-coat mottling was unreliable as an indicator of virus infection of the mother plants and the presence of infectious virus in seed. The distribution of SMV in the field suggested plant-to-plant spread from the primary inoculum foci. Apparently, this primary inoculum consists of infected seedlings derived from SMV-infected seed.