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Vector Relations

Aphid Transmission of Peanut Mottle Virus. O. R. Paguio, Department of Plant Pathology and Plant Genetics, University of Georgia, Athens 30602; C. W. Kuhn, Department of Plant Pathology and Plant Genetics, University of Georgia, Athens 30602. Phytopathology 66:473-476. Accepted for publication 10 November 1975. DOI: 10.1094/Phyto-66-473.

Aphis craccivora and Myzus persicae were used in peanut mottle virus (PMV) transmission studies. Aphids starved 4-6 hours in glass dishes were allowed to probe one time on an infected leaf, and then transferred singly to healthy peanut seedlings. Both aphids transmitted four of the five known strains of PMV in a stylet-borne manner. Efficiency of transmission was similar (21-54%) for two mild mottle strains and the severe mosaic strain, it was significantly reduced (9-18%) for the chlorotic line pattern strain, and the necrosis strain was not transmitted by the aphids. Transmission rates were about two and one-half times as great for M. persicae as for A. craccivora. Also, M. persicae remained infective after acquisition for 12 hours as compared to 2 hours for A. craccivora. The acquisition host was usually peanut, but the transmission results were not altered when Pisum sativum, a host with a higher concentration of all strains of PMV, was used. After an acquisition probe on peanut, a single probe by A. craccivora on non-PMV hosts (pepper and cotton) reduced the transmission to peanut by 50-69%. Feeding on nonhosts did not affect PMV transmission by M. persicae.