农药对褐稻虱天敌草间小黑蛛及褐稻虱的毒力影响试验

本文从稻田使用的防病虫农药中筛选出四种对草间小黑蛛低毒的农药品种，然后再进行这四种农药对草间小黑蛛及褐稻虱的相对毒力比较试验，最后得出，扑虱灵、叶蝉散、乙酰甲胺磷有较好的选择毒性。杀虫双虽对草间小黑蛛的杀伤能力低，但由于杀虫双对褐稻虱的杀伤能力亦低，其选择毒性就不甚理想。

The Comparative Test of Relative Toxicity of Insecticides to Brown Planthopper(Nilaparvata lugens stal)and Spider(Erigonidium gramimicola sundvall)

Using the So aking method as relative toxicity test to brown plantopper and ita naturalenemy, buprofezin, MIPC, acphate,and demihypo are screened from 13 insecticides. Based on theabove-mentioned test, the selective toxicity of MIPC, acephate,buprofezin, and demihypo areestimated by comparative test of relative toxicity to brown planthopper and spider. Factors for relativetoxicity of buprofezin to initial hatehing nymph spiders and four-instar nymbh of brown plant hopperis 8.75. MIPC to initial hatching nymph spiders and four-instar nymph of brown plantopper is 5. 49. Acephate is 2.2. Demihypo is 0.25.The authors suggest that buprofezin and MIPC be goodinsecticides of selective toxicity,They could be used to control brown planthopper alternately.