Effects of matrine-nicotine missible oil on controlling the poplar leaf pests
The matrine-nicotine missible oil with 1.2% potency was diluted with water(1:600,1:800 and 1:1000),and then sprayed to poplar respectively,in order to control Micromelalopha troglodyta,Clostera ana-choreta and Botyodes diniasalis.After the larvae were sprayed with 1:600 dilution,the death rates were 100%,99.2% and 100%,and the corrected mortality were 100%,99.2% and 100% respectively.The death rates of larvae sprayed with 1:800 dilution were 93.2%,96.9% and 95.7%,and the corrected mortality were 92.8%,96.7% and 93.0%.The death rates with 1:1 000 dilution were 79.2%,64.3% and 80.5%,and the corrected mortality were 78.0%,62.3% and 79.4% respectively.The t-test results showed the difference of death rates of larvae between dilutions of 600 and 800 times,600 and 1 000 times,800 and 1 000 times were significant different(P0.01).The best control effects could be achieved by spraying 1:600 dilution of matrine-nicotine missible oil with 1.2% potency.