Transmission studies revealed that a single viruliferous Bemisia tabaci (Genn.) was able to transmit the virus successfully and maximum percentage of infection was obtained when 10 white flies were used per test plant. Maximum percentage of infection resulted when the vector was given a pre-acquisition starvation starvation of 3 hr. and acquisition feeding period of 24 hr. The incubation period was 8 hr. High percentage of infection resulted when the transmission feeding period of the vector was 24 hr The virus was retained by the vector for a maximum period of 4 days. There was no trans- ovum transmission, and the first instar nymphs of the vector were not capable of acquiring and transmitting the virus.
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