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采用点滴法在室内测定了阿维菌素对水稻二化螟和稻纵卷叶螟的生物活性,并研究其田间防治效果及对天敌的安全性。室内毒力测定结果表明,阿维菌素对二化螟和稻纵卷叶螟的LD50值分别为0.0199μg/g和0.0252μg/g,其活性分别是丙溴磷的37.48倍和17.59倍、毒死蜱的36.24倍和21.42倍。田间试验结果表明,1.8%阿维菌素乳油(ai)9～18g/hm2处理对水稻二化螟和稻纵卷叶螟的防治效果分别为74.08%～82.22%和79.04%～87.19%,显著优于对照药剂50%丙溴磷乳油(ai)360g/hm2处理和480g/L毒死蜱乳油(ai)360g/hm2处理。阿维菌素对稻田天敌蜘蛛和黑肩绿盲蝽的消长有一定影响,9～13.5g/hm2处理药后14天对蜘蛛和黑肩绿盲蝽虫口减退率分别为18.75%～30.21%和22.57%～33.94%,显著低于对照药剂丙溴磷360g/hm2处理和毒死蜱360g/hm2处理;18g/hm2处理药后14天对蜘蛛和黑肩绿盲蝽虫口减退率分别为47.92%和39.29%,与两对照药剂无显著差异。
The indoor activity of abamectin on rice stem borer and rice leaf roller was determined by using the drip method, and its field control effect and its safety to natural enemies were studied. The results of indoor toxicity test showed that the LD50 values of abamectin on the rice stem borers and the rice leafroller were 0.0199μg / g and 0.0252μg / g, respectively, and their activities were 37.48 and 17.59 times higher than that of profenofos, 36.24 times and 21.42 times of chlorpyrifos. The results of field trials showed that the control effect of 1.8% abamectin (ai) 9 ~ 18g / hm2 on rice stem borer and rice leafroller were 74.08% ~ 82.22% and 79.04% ~ 87.19% Is superior to the control agent 50% of aripiprimicapide (ai) 360g / hm2 treatment and 480g / L of ai 360g / hm2 treatment. Avermectins had some effect on the growth and decline of the natural enemies Spider and Black-shouldered Apodemus in paddy fields. The rates of oral decline of Spider and Black-shouldered Green Bugs were 18.75% -30.21% and 14 days after treatment with 9 ~ 13.5g / hm2, respectively 22.57% -33.94%, which was significantly lower than 360 mg / hm2 of the control agent profilloside and 360 g / hm2 of chlorpyrifos; the oral reduction rates of spider and black shoulders green stinkbug were 47.92% and 39.29 respectively after 14 days of 18g / hm2 treatment %, No significant difference with the two control agents.