Studies on the transmission of pea leaf roll virus byMyzus persicae(Sulz.)

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Abstract
Factors affecting transmission of pea leaf roll virus by the aphid Myzus persicae (Sulz.) were studied. Results indicated that this virus exhibits properties consistent with those described for circulative viruses. The minimum feeding period for acquisition of the virus from infected leaves was from four to six hours, and for transmission to healthy plants between six and 24 hours. Aphids could infect plants for at least eight days after acquiring the virus. Approximately 25 aphids per pea plant during transmission were needed to infect 100% of the test plants. The number of test plants which became infected was directly correlated with the number of viruliferous aphids feeding on them. However, the number of aphids had no effect on the severity of infection. Young leaves of infected plants were the best site for acquisition of virus. The percentage of plants becoming infected decreased as the size of the test plants (when inoculated) increased.

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