Abstract
Antiviral chemicals were tested against aphid-transmitted plant viruses in green-house experiments to determine whether such chemicals act differently against aphid and mechanical transmission of viruses. Sprays of Cytovirin (metabolite of Streptomyces sp.) were less effective against aphid transmission of potato virus Y (PVY) and cucumber mosaic virus than when those viruses were mechanically transmitted. Cytovirin was ineffective against aphid-transmitted pea virus 2 and cabbage virus B. A wetting agent did not increase the effectiveness of Cytovirin. Cytovirin applied to PVY-infected foliage did not interfere with aphid acquisition of PVY and had no direct effect on PVY when fed to viruliferous aphids. Trichothecin (metabolite of Trichothecium roseum Link) reduced PVY infections of tobacco by about one-half when the virus was aphid-transmitted but had no effect on cabbage virus B. Milk failed to prevent aphids from transmitting PVY to tobacco plants.
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