阿维菌素对二化螟和稻纵卷叶螟的生物活性及稻田天敌的影响  

Bioactivity of avermectins to Chilo suppressalis Walker and Cnaphalocrocis medinalis Guenée and the influence to natural enemies in the paddy fields

作　　者：李保同[1] 裴春梅[1] 石庆华[1] 潘晓华[1] 徐月明[1] 

机构地区：[1]江西农业大学农学院,南昌330045

出　　处：《植物保护学报》2009年第6期550-554,共5页Journal of Plant Protection

基　　金："十一五"国家科技支撑计划重大项目(2006BAD02A04);江西省自然科学基金(0630046)

摘　　要：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 bioactivity of avermectins to Chilo suppressalis and Cnaphalocrocis medinalis were determined with topical application in the greenhouse, its efficacy to C. suppressalis and C. medinalis and the influence to natural enemies were tested in the paddy fields. The laboratory bioassay results indicated that the LDs0 values of avermectins to C. suppressalis and C. medinalis were 0. 0199 μg/g and 0. 0252 μg/g, respectively. It bioactivities were 37.48 times and 17.59 times as high as those of profenofos, 36.24 times and 21.42 times as high as those of chlorpyrifos, respectively. In a field experiment, control effects of 1.8% EC avermectin at the rate of 9 - 18 （ai） g/hm2 to C. suppressalis and C. medinalis were 74.08% - 82.22% and 79.04% - 87.19%, respectively, significantly higher than that of 50% EC profenofos and 480 g/L EC at the rate of 360 （ai） g/hm2. The dropping rates of 1.8% EC avermectins at the rate of 9 - 13.5 （ai） g/hm2 to the spiders and Cyrtorhinus lividipennis were 18.75 % - 30.21% and 22.57 % - 33.94% on the ldth day after spraying insecticides, significantly lower than that of 50% EC profeno- fos and 480 g/L EC at the rate of 360 （ai） g/hm2 The dropping rates of 1.8% EC avermectins at the rate of 18 （ai） g/hm2 to two kinds of natural enemies were 47.92% and 39.29% , respectively, equal to that of two chemical control insecticides.

关 键 词：阿维菌素 二化螟 稻纵卷叶螟 天敌 生物活性 

分 类 号：S435.112.1[农业科学—农业昆虫与害虫防治]