中文摘要：

蚊蝇醚属于昆虫生长调节剂类新型杀虫剂,具有广谱、高效、低毒等特点。为明确蚊蝇醚应用于农业害虫防治可能造成的环境污染是否对家蚕产生慢性毒性,采用食下毒叶法研究蚊蝇醚对家蚕生长发育的影响。结果表明：蚊蝇醚对家蚕2龄幼虫的急性毒性较小,96 h的LC50值大于1 000 mg/L,幼虫急性中毒症状主要表现为吐液、头胸部肿大以及身体扭曲呈＂S＂形等;蚊蝇醚对家蚕2龄幼虫的慢性毒性较大,对幼虫的生长发育具有显著影响,主要表现为体色变黄、不食不动、生长缓慢;添食75～1 000 mg/L蚊蝇醚药液处理的桑叶,均可导致幼虫龄期延长,眠期体质量增加,发育不齐,最终无法正常结茧、化蛹。依据试验结果认为：蚊蝇醚对家蚕的毒性缓慢而持久,在推广应用于防治农业害虫时应远离桑园。

英文摘要：

Pyriproxyfen is a new type of insecticides which belong to insect growth regulators.It has the characteristics of broad-spectrum,high efficiency and low toxicity etc.In order to clarify whether the environmental contamination from using pyriproxyfen for agricultural pest control causes chronic toxicity to silkworm（Bombyx mori L.）,the present study determined the effect of pyriproxyfen to the growth and development of silkworm with leaf dipping method.The results indicated that pyriproxyfen had low acute toxicity to the 2nd instar silkworm larvae,with LC50 at 96 h greater than 1 000 mg/L.The symptoms of acute toxicity of larva included vomiting,head and thorax swelling,and body twisting into ＂S＂ shaped.The chronic toxicity of pyriproxyfen to the 2nd instar silkworm larvae was relatively high,with significant influence on growth and development of the larvae.The major symptoms included yellow body color,no eating,no movement,and slow growth.All larvae feeding on mulberry leaves treated with 75～1 000 mg/L of pyriproxyfen showed prolonged larval duration,higher body weight at moulting,uneven development,and a final failure in normal cocooning and pupation.According to these test results,the toxicity of pyriproxyfen to silkworm is slow and durable.It should be far away from mulberry field when used for agricultural pest control.