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SUMMARYMaize dwarf mosaic virus strain B was purified to apparent homogeneity. Virus protein migrated as a single component in polyacrylamide gels and had a mol. wt. of 365oo when estimated by sodium dodecyl sulphate gel electrophoresis but 285oo as determined by amino acid analyses. A total of 264 amino acid residues are present in the protein. The virus contains 6 % RNA based on its phosphorus content (o'54 + o'o7 %) and the nucleotide composition of its nucleic acid (33"54 % adenylic acid, 2o-21% guanylic acid, I6.2I % cytidylic acid, and 3o-ol % uridylic acid).

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

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