摘要
设定2种吡虫啉浓度(有效浓度分别为37.5、15.0 g.hm-2),探讨其对褐飞虱的卵寄生蜂稻虱缨小蜂的毒性。结果表明:稻虱缨小蜂成虫在接触高浓度吡虫啉1.5 h及低浓度吡虫啉2 h后,死亡率均达100%,显著高于未接触药剂的对照[死亡率为(1.67±1.67)%]。携带稻虱缨小蜂幼体的稻苗经高浓度吡虫啉处理后,稻虱缨小蜂的羽化率为(83.53±1.81)%,显著地低于未经药剂处理的对照(92.09±0.75)%。吡虫啉对稻虱缨小蜂的致死中浓度(LC50)为790.89μg.kg-1。稻虱缨小蜂接触250、500μg.kg-12种亚致死浓度吡虫啉后,分别有40%和65%残存个体未能对褐飞虱为害稻株挥发物作出反应;而作出反应的个体亦不能区分虫害稻株与健康稻株的气味。然而,接触2种亚致死浓度吡虫啉后,存活的稻虱缨小蜂对褐飞虱利它素的行为反应及对褐飞虱卵的寄生率无明显改变。
Lethal toxicity of two concentrations of imidacloprid(37.5,15.0 g·hm-2) against Anagrus nilaparvatae,an egg parasitoid of the rice planthopper,Nilaparvata lugens were assessed in this study.Mortalities of adult wasp exposure to high concentration of imidacloprid reached 100% at 1.5 h exposure-period,and mortalities of adult wasp exposure to low concentration of imidacloprid reached 100% at 2.0 h exposure-period.They were both significantly higher than that of the control [(1.67±1.67)% mortality].The emergen...
出处
《扬州大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2009年第4期80-84,共5页
Journal of Yangzhou University：Agricultural and Life Science Edition
基金
国家自然科学基金资助项目(30500329)
国家"十一五"科技支撑计划项目(2006BAD02A03)
江苏太湖治理专项(BS2007143)
扬州大学大学生学术科技创新基金资助项目(2007-05)
关键词
稻虱缨小蜂
吡虫啉
毒性
亚致死效应
Anagrus nilaparvatae
imidacloprid
toxicity
sublethal effect
