Field Insecticides Trial against Cowpea Aphid（Aphis craccivora）and Liriomyza sativae
LIU Kui1,XU Jiang2,LIN Shang-tong2,GUAN Yi-pu2,LU Hui1,ZHONG Yi-hai1
1Environment and Plant Protection Institute,Chinese Academy of Tropical Agricultural Sciences,Danzhou 571737,Hainan,China;2Environment and Plant Protection College of Hainan University,Danzhou 571737,Hainan,China
Abstract：Insecticides of 2.5 % imidacloprid EC,2.5 % lambda-cyhalothrin EC,5 % acetamiprid EC,100 g·L-1 alpha-cypermethrin EC and 25 % buprofezin WC were used for field trial against cowpea aphid（Aphis craccivora）.Insecticides of 480 g·L-1 chlorpyrifos EC,4.5 % cypermethrin EC,80 % dichlorvos EC,75 % cyromzinge WP and 0.5 % emamectin benzoate EC were used for field trial against Liriomyza sativae.The results showed that 1 500 times dilution of 2.5 % imidacloprid EC,2 000 times dilution of 2.5 % lambda-cyhalothrin EC,1 000 times dilution of 5 % acetamiprid EC and 2 000 times dilution of 100 g·L-1 alpha-cypermethrin EC could effectively control cowpea aphid and the efficacy were all above 95.76 % during 1 day to 10 days after control.The efficacy of 1 000 times dilution of 25 % buprofezin WC was very low and it was only 66.68 % in 3 days after spraying.3 000 times dilution of 75 % cyromzinge WP had good control effects on Liriomyza sativae and its efficacy was 89.63 %，94.10 % and 93.28 % differently after 3 days，7 days and 10 days.The secondary efficacy was given by 480 g·L-1 chlorpyrifos EC,with control effect of 61.12 %，69.15 % and 69.40 % after 3 days，7 days and 10 days.The other insecticides all had very low efficacy.
