果园几种常用农药对荔枝蝽卵跳小蜂的毒性

就15种果园常用农药的田间使用浓度对卵跳小蜂成蜂的毒性进行测定,试验结果表明:植物质杀虫剂印楝素、微生物杀虫剂高效B t.对卵跳小蜂的触杀毒性较小;菊酯类杀虫剂、抑太保、杀虫双和三氯杀螨醇对卵跳小蜂的触杀毒性均较高;卵跳小蜂对有机磷杀虫剂如辛硫磷、敌敌畏及氧乐果等非常敏感,但对敌百虫有较强的耐受性。因此在综合防治中避免使用有机磷类、菊酯类等农药,应合理选择使用一些生物源杀虫剂以减少对卵跳小蜂的杀伤。

Toxicity of Some Insecticides to Ooencyrtus Corbetti

The contact toxicity of fifteen insecticides in field concentrations to ooencyrtus corbetti adults,a parasite of the litchi stinkbug tessaratoma papillosa,was tested.The results showed that biological insecticides,such as neem oil(plant derivative),Bacillus thuringiensis(microbial insecticides),had low toxicity to ooencyrtus corbetti;synthetic pyrethroids,chlorfluazuron(insect growth regulators),dimthypo and dicofol have high toxicity;organic phosphates insecticides had very high toxicity to the wasp,but the contact toxicity of trichlorfon to this wasp was small.In order to reduce the harmful effects of insecticides to ooencyrtus corbetti,some high toxically insecticides such as organophosphate insecticides must stop using,and some reasonable low-toxical insecticides such as some effective biological insecticides should be first considered.