Study on the Insecticidal and Antifeedant Activity of Extracts from Walnut Peel against Wolfberry Aphids

The research aimed to study the insecticidal and antifeedant activity of extracts from walnut peel against wolfberry aphids.The insecticidal activities of the ethanol extract and 4 kinds of extracts with petroleum ether,chloroform,ethyl acetate and water from walnut peel against wolfberry aphids were studied.The results showed that 95% ethanol extract displayed high contact insecticidal activity to wolfberry aphids.The corrected mortality after 48 h reached 86.6% under the concentration of 50.00g/L.The insecticidal and anti-feeding activities of 4 extractsagainst wolfberry aphids were in the order of water extract chloroform extract ethyl acetate extract petroleum ether extract.The corrected mortality of water extract after 48h was 93.0%.Walnut peel had very high contact toxicity and anti-feeding activities to wolfberryaphids,and the activity substances were a kind of strong polar compounds.