Abstract
Green peach aphids, Myzus persicae Sulz. fed on the Physalis floridana Rydb. plants infected with potato leaf-roll virus (PLRV) for 3 hours, began to transmit the virus 9 hours after leaving the source plants. Aphids injected with extracts or blood from the viruliferous insects were also enable to transmit PLRV 6 hours after injection. The length of the latent period and the frequency of virus transmission in its aphid vector appeared to depend on the virus concentration within the vector. Inoculativity in the transmission of aphids tended gradually to increase till 24 hours after acquisition feeding or injection of extracts and blood from viruliferous insects.PLRV was detected in extracts and blood from aphids fed on the infected P. floridana plants for more than 3 hours, but no virus was recognized in them from insects given an hour's acquisition feeding. Even though the concentration of PLRV in the aphid vectors increased with the prolonged acquisition feeding, it decreased gradually with the time after leaving the source plants. The frequency of virus recovery from blood of the injected aphids also tended similarly to decrease gradually with the time after injection of the virus into aphids.The latent period of PLRV in the aphids vectors appeared to represent the time required for the virus to circulate within the insect body.
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