杀虫剂对褐稻虱种群控制作用的评价

本文应用干扰作用控制指数分析不同类型杀虫剂对褐稻虱的作用.褐稻虱繁殖力强,天敌作用明显,试验结果说明,广谱性杀虫剂喹硫磷,由于对天敌作用的明显干扰,干扰作用控制指效值达2.69倍。即其下代数量将为对照的2.69倍;特异性杀虫剂扑虱灵,对褐稻虱的作用明显,对其天敌比较安全,其干扰作用控制指数值为0.37。即其下代数量明显下降,收到良好效果,干扰作用控制指数表达了杀虫剂对害虫种群的控制作用、包括对天敌干扰作用的总体效果。特异性杀虫剂在解决有害生物协调管理将会起着良好的作用。

EVALUATION OF THE EFFECTIVENESS OF VARIOUS INSECTICIDES ON THE BROWN RICE PLANTHOPPER

In this paper,the life tables and the interference index of population control (IIPC) were used as the methods to evaluate the effectiveness of insecticides on the population dynamics of brown rice planthopper,Nilaparoata lugens The brown plantehopper,is an insect with high fecundity but with high vulnerability to natural enemies.The results showed that spraying an area with wide-spectrum insecticides,such as quinophos,interfered with the efficacy of the natural enemies markedly,giving an IIPC as high as 2.69.That is to say,the population size of the next generation will be increased to 2.69 times as against the original.At the same time,spraying with the highly selective insecticide buproferin,killed mainly the pest and favoured the effcacy of the natural enemies,giveing an IIPC as low as 0.37.That is the population size of the next generation will be decreased to 0.37 times as against the original.The interference index of population control showed a general effect on the pest insect,including side effects on its natural enemies.The highly selective insecticides are important in integrated pest management (IPM).