狼毒大戟水浸液对家蚕的药杀效果

[目的]以家蚕为试验材料,研究药用植物狼毒大戟对鳞翅目昆虫的药杀效果。[方法]取多年生新鲜狼毒大戟根制成水浸液,用于涂抹家蚕背部、浸泡家蚕、涂抹桑叶饲喂家蚕。[结果]用药液涂抹背部的家蚕无明显的中毒症状;浸泡1、3 min的家蚕取出后可存活7 d左右;浸泡5 min的家蚕可存活2 d左右;浸泡15 min的家蚕取出后最多可存活10 h。家蚕取食涂抹狼毒大戟水浸液的桑叶后,2 d内100%死亡。[结论]狼毒大戟水浸液对家蚕具有明显的触杀和胃毒作用。

Toxicity Effects of Water Extract of Euphorbia fischeriana Steud.against Silkworm

[Objective] Taking silkworm as the test material,the research aimed to study the toxicity effects of Euphorbia fischeriana Steud.against the insects in Lepidoptera.[Method]Water extract was prepared with fresh perennial E.fischeriana Steud,which was applied in silkworm with different methods including daubing the extract on silkworm back,dipping silkworm into the extract and feeding silkworm with the mulberry leaves daubed by the extract.[Result]Those silkworms whose backs were daubed with the water extract had no obvious poisoning symptom.The silkworms dripped for 1 and 3 min could be survived for about 7 d;the silkworms dripped for 5 min could be survived for about 2 d;and the silkworms dripped for 15 min could be survived for 10 h at most.Those silkworms fed with mulberry leaves daubed by water extract completely died after 2 d.[Conclusion]The water extract of E.fischeriana Steud.had significant contact toxicity and stomach poisoning against silkworm.