VIEW ARTICLE

Squash Mosaic Virus Variability: Epidemiological Consequences of Differences in Seed Transmission Frequency Between Strains. Merritt R. Nelson, Department of Plant Pathology, University of Arizona, Tucson 85721; Hjalmar K. Knuhtsen, Department of Plant Pathology, University of Arizona, Tucson 85721. Phytopathology 63:918-920. Accepted for publication 2 February 1973. DOI: 10.1094/Phyto-63-918.

Seed transmission in pumpkin, cantaloupe, honeydew, squash, and watermelon was investigated for a representative of each of the serological groups of squash mosaic virus. The group I representative, IA, was seed transmitted in all cucurbits tested. The group II representative, IIA, was seed transmitted only in pumpkin and squash. These results provide an explanation for the failure to isolate members of group II from muskmelons in the field.