常用杀虫剂对稻田迁飞性害虫的控制作用及其对天敌的安全性评价

在稻纵卷叶螟和白背飞虱混发期对7个常用杀虫剂的控制作用及其对天敌的安全性进行了评价。结果表明,2.5%高效氯氟氰菊酯EC(30 ml/667 m2) 70%艾美乐(吡虫啉)WG(7.14 g/667 m2)处理和31%三拂(三唑磷 氟虫腈)ME(70 ml/667 m2)对稻纵卷叶螟和白背飞虱均具有较强的控制效果。但是高效氯氟氰菊酯、锐劲特(5%氟虫腈)、高效氯氟氰菊酯 艾美乐和三拂均对主要蜘蛛有较强的杀伤作用,而三唑磷和新农宝(40%毒死蜱)对蜘蛛相对安全。高效氯氟氰菊酯和三唑磷单剂对白背飞虱和褐飞虱均具有明显的增殖作用,但可通过与锐劲特混配减轻增殖效应。因此,在田间稻纵卷叶螟和稻飞虱兼发的情况下,推荐使用三拂进行兼治,以减少杀虫剂的用药次数、药量及其对稻飞虱的增殖效应。

Control efficiency of common insecticides on migratory pests and their safety evaluation for natural enemies in paddy fields

The controlling effects of seven common insecticides on migratory pests,Cnaphalocrocis medinalis and Sogatella furcifera,and their safety evaluation for spiders in rice field were studied.The results showed that lambda-cyhalothrin(2.5% EC,30 ml/667m2) mixed with imidacloprid(70% WG,7.14 g/667m2),Sanfu(31% ME,mixture of fipronil and triazophos,70 ml/667m2) had significant controlling efficiencies on C.medinalis and S.furcifera.But lambda-cyhalothrin,fipronil and Sanfu had obvious detrimental effects on spiders,while triazophos and chlorpyrifos were relatively safety to these natural enemies.It had been found that population numbers of N.lungens and S.furcifera increased after treated with lambda-cyhalothrin and triazophos,respectively.The results further indicated that application of Sanfu(31% ME) not only achieved controlling role to C.medinalis and planthoppers,but also reduced spraying times and dosage of insecticides in paddy fields.