不同农药对海南山蛭毒力测定及其防治研究

在室内,利用速灭杀丁,叶蝉散,杀虫双,乐果,三氯杀螨,草甘膦等6种农药对海南山蛭（Haemadipsa hainane)进行毒力测定,比较各种农药LK50表明,速灭杀丁＞叶蝉散＞三氯杀螨醇＞杀虫双＞乐果,除草剂草苷膦对海南山蛭完全无毒杀作用,草甘膦＋速灭杀丁对海南山蛭仍有很强的毒杀作用,海南山蛭对速灭杀丁的敏感性为,成体＞幼体＞亚成体,在田间小区试验表明,1．5％速灭杀丁防治效果为95．08％,大面积应用表明“草苷膦药液＋0．5％速灭杀丁”防治效果最好,达94．74％,“草甘膦药液＋1％叶蝉散乳油”防治效果次之,达90．5％,草甘膦＋灭蛭农药是防治山蛭好药剂,达到灭蛭除草的目的。

Toxicity of different pesticides to Haemadipsa hainana and its control.

Laboratory determination on the toxicity of sumicidin, isoprocarb, dicofol, thiocyclam, dimethoate and glyphosate to Haemadipsa hainana showed that LD50 for the six pesticides followed the order of sumicidin > isoprocarb > dicofol > thiocyclam > dimethoate, but glyphosate was not virulent. "Glyphosate + sumicidin" had much more toxicity. The susceptibility of H. hainana to sumicidin differed in the order of adult > juvenile > subadult. Field tests showed that the control effect of 1.5% sumicidin to H. hainana was 95.08% of total number of its population. Applied tests showed that the control effect of "Glyphosate + 0.5% sumicidin" was 94.7%, and "glyphosate + 1% isoprocarb" was 90.5%. "Glyphosate + pesticides" was more effective both in controlling H. hainana and in destroying its habitat weed.