COMPARATIVE STUDIES BETWEEN THE APHID TRANSMISSION OF POTATO LEAF ROLL AND TURNIP LATENT VIRUSES

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Abstract
Transmission of potato leaf roll and turnip latent viruses by Myzus persicae (Sulz.) were similar in that: (a) fasting aphids for 18 hours prior to inoculation feeding had no effect on the numbers that transmitted virus; (b) upper and lower surfaces of infected leaves of Physalis floridana Rydb. were equally good sources of virus; (c) top leaves of infected plants were better sources of virus than middle or bottom ones; (d) excised leaves were better sources of virus than whole plants for short acquisition feeding periods but not for longer ones; (e) when infective aphids fed on a small area of a leaf, they transmitted virus as often as those that fed on whole plants; (f) and more nymphs transmitted virus than adults.The transmission of the two viruses differed in that: (a) during comparable acquisition and inoculation feeding periods more aphids transmitted potato leaf roll than turnip latent virus; (b) fasting aphids for 18 hours prior to acquisition feeding had no effect on the numbers that transmitted potato leaf roll, but increased the numbers that transmitted turnip latent virus; (c) and three- or six-leaf P. floridana were equally good test plants for potato leaf roll, but more three-leaf ones became infected with turnip latent virus.