Studies on the transmission of sugar-beet yellows virus by the aphis, Myzus persicae (Sulz.)

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Abstract
The efficiency of the vector M. persicae in transmitting sugar-beet yellows virus increased greatly with increasing feeding time on the infected plants. Infection was produced on a succession of healthy plants in 1, 2 or 3 days depending on the length of the infection feeding time. The infectivity of the vectors increased with increasing feeding time on the healthy plants undergoing infection, and decreased with increasing feeding time on healthy plants prior to that when the infection trial was made. There was no clearly denned "incubation period" of the virus in the vector, below which no insect could cause infection, but there was variation in the time between cessation of infection feeding of the aphis and the initiation of infection in the healthy plants. The relation of this virus with its vector differs from those of the viruses already descr. as non-persistent. For the latter viruses infectivity is lost by M. persicae soon after cessation of infection feeding; after fasting the vectors become optimally infective almost immediately on penetrating infected tissues of the leaf. Their infectivity decreases with increasing feeding time on the infected plants, and increases only slightly with increasing feeding time on the healthy plants. The behavior of sugar beet yellows virus is compared with that of curly-top virus of sugar beet, in which infectivity also persists for an indefinite period in the vector and increases with increasing feeding time on infected and healthy plants.

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