九种农药对稻田蜘蛛的影响及其对飞虱的防治效果

为保护稻田蜘蛛,高效防治飞虱,对9种农药进行了试验。结果表明：药后2 d,阿维菌素高剂量（750 ml/hm2）和低剂量（375 ml/hm2）处理均对稻田蜘蛛的杀伤力大,处理区蜘蛛比对照区减少89%;药后7 d,阿维菌素2种剂量处理和毒死蜱高剂量处理对稻田蜘蛛的杀伤力大,处理区蜘蛛均比对照区减少58.8%以上;药后13 d,阿维菌素2种剂量处理和氯氰菊酯处理对稻田蜘蛛的杀伤力大,处理区蜘蛛均比对照区减少57.6%以上;药后28 d,农药对稻田蜘蛛的杀伤力不明显。药后2 d,毒死蜱高剂量处理区对飞虱的防效最好,达87.9%;药后7d、13d、28d,吡蚜酮处理区对飞虱的防效最高,分别达89.7%、90.8%、72.4%。综合表明：吡蚜酮为稻田防治飞虱最优品种,不但防效高,而且对蜘蛛安全。

Effects of 9 Insecticides on Killing Spiders and Controlling Planthoppers

Field experiments with 9 kinds of pesticides were conducted to protect the rice spiders and control planthoppers efficiently.The results indicated that 2 days after avermectin at a high or a low dosage were applied to the rice paddy spider＇s mortalities were higher than other insecticides＇ treatments,the treatment areas＇ spiders reduces 89% compared to the control treatment.7 days after avermectin at a high or a low dosage and chlorpyrifos at a high dosage were applied to the rice paddy spider＇s mortalities were higher than other insecticides＇ treatments,the treatment areas＇ spiders reduces 58.8% compared to the control treatment;13 days after avermectin at a high or a low dosage and cypermethrin at a high dosage were applied to the rice paddy spider＇s mortalities were higher than other insecticides＇ treatments,the treatment areas＇ spiders reduces 57.6% compared to the control treatment;after 28 days,the pesticides are not obvious to the rice paddy spider＇s lethality.2 days after chlorpyrifos,it high dose to process area to be best to planthoppers control effect,reaching 87.9%;7 days,13 days,28 days after it,pymetrozine processing area is highest to planthoppers control effect,respectively reaches 89.7%,90.8%,72.4%.The comprehensive results showed that pymetrozine was a best insecticide to control the planthoppers in the rice paddy.It had significant control efficacies to the insects and a security to spiders.