[Effect of plant alcohol extracts on vegetable aphids and their parasitoids]

The repelling and controlling effect of alcohol extracts from 8 common plant species on 3 major vegetable aphids (Myzus persicae, Aphis gossypii and Lipaphis erysimi) were studied in the laboratory, and the effect on their parasitoid was also studied. The results showed that the test 8 plant species had some effects on 3 aphids. The plant alcohol extracts from Tephrosia vogelli and Cinnamomum camphora had the most effect. The deterrent rate on Myzus persicae, Aphis gossypii and Lipaphis erysimi was 0.414, 0.729, 0.547 and 0.549, 0.690, 0.729, respectively. These 2 plants had the most controlling effect on 3 aphids, too. The alcohol extract of Cinnamomum camphora was safely for parasitoids (Aphidius gifuensis and Diaeretiella rapae).