Transmission of Citrus Tristeza Virus by the Melon Aphid

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Abstract
The VT isolate of citrus tristeza virus was transmitted efficiently by 10 aphids [Aphis gossypii (Glov.)] (36%) and even with 5 aphids per test plant substantial transmissions (11%) were obtained. No transmission was obtained from acquisition or infection feeding periods of 5 min, and about 6 h for each period was required to obtain near-maximal transmission. Melon aphids retained inoculativity after 3.5 h of post-acquisition fasting and when feeding for 2 or 6 h on an intermediate cucumber plant or lime seedling, respectively. These features are characteristic of a semipersistent mode of transmission.

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