部分有机磷和拟除虫菊酯类农药对家蚕的毒性测定

基于为蚕区桑园及周围农田安全合理选择和使用农药提供科学依据的目的,采用浸叶法测定了部分常用有机磷和拟除虫菊酯类农药对家蚕的急性毒性,比较了同一类型不同有效成分或有效成分相同但由不同生产商生产的农药对家蚕的毒性,并根据其毒性强弱进行分级。结果表明:蛀迪(20%三唑磷EC)等5种有机磷类农药和比奇(4.5%高效氯氰菊酯EC)等16种拟除虫菊酯类农药对家蚕高毒性(0.1 mg/L≤LC50<10 mg/L),农斯特(48%毒死蜱EC)等5种有机磷类农药和甲功(2.5%高效氯氰菊酯EC)等3种拟除虫菊酯类农药为中等毒性(10 mg/L≤LC50<1 000 mg/L);同一类型农药不同有效成分或有效成分相同但由不同生产商生产的农药对家蚕的毒性不同。因此,在桑园及周围农田用药时应仔细分辨药剂生产商和有效成分种类,尽可能避免使用对家蚕高毒性的农药。

Determination of Toxicity of Organophosphorous and Pyrethriod Insecticides to the Silkworm Bombyx mori

In order to provide scientific basis for selecting and applying pesticides reasonably in mulberry gardens and in surrounding agricultural fields,acute toxicity of 10 organophosphorous and 19 pyrethroid pesticides to Bombyx mori was determined using leaf-dipping method.The toxicity was compared based on their active ingredient of organophosphorous and pyrethroid pesticides or on the same active ingredient but made by indifferent manufactures and was graded according to LC50 value.The results showed that 5 or...