防治豇豆蚜虫和美洲斑潜蝇的田间药效试验

选用2.5%吡虫啉乳油、2.5%高效氯氟氰菊酯乳油、5%啶虫脒乳油、100g.L-1高效灭百可乳油、25%噻嗪酮可湿性粉剂对豇豆蚜虫进行田间防治试验;选用480g.L-1毒死蜱乳油、4.5%高效氯氰菊酯乳油、80%敌敌畏乳油、75%灭蝇胺可湿性粉剂和0.5%甲氨基阿维菌素苯甲酸盐乳油对豇豆美洲斑潜蝇进行田间防治试验。结果表明:药后1～10d,2.5%吡虫啉乳油1500倍液、2.5%高效氯氟氰菊酯乳油2000倍液、5%啶虫脒乳油1000倍液和100g.L-1高效灭百可乳油2000倍液对豇豆蚜虫防治效果均在95.76%以上,防效优良;25%噻嗪酮可湿性粉剂1000倍液对豇豆蚜虫的防治效果仅为29.79%～66.68%,防效很差。75%灭蝇胺可湿性粉剂3000倍液对美洲斑潜蝇防效最好,药后3、7和10d的防治效果分别为89.63%、94.10%和93.28%;其次是480g.L-1毒死蜱乳油1000倍液,药后3、7和10d的防治效果分别为61.12%、69.15%和69.40%;其他几种药剂的防效均较差。

Field Insecticides Trial against Cowpea Aphid (Aphis craccivora) and Liriomyza sativae

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.