吡虫啉不同剂型对蜜蜂的急性毒性

以成年意大利工蜂(Apis mellifera L.)为受试生物,研究了吡虫啉原药及其不同制剂对蜜蜂的急性经口和接触性毒性。结果表明:在急性经口试验中,48 h的LD50值在1.60×10~(-2)到0.805μg a.i./蜂之间,以20%吡虫啉微乳剂的毒性最强,600 g/L吡虫啉悬浮种衣剂的毒性最弱,最强毒性是最弱毒性的50.31倍;在急性接触试验中,48 h的LD_(50)值在2.10×10~(-2)到0.225μg a.i./蜂之间,以2.15%吡虫啉饵剂的毒性最强,600 g/L吡虫啉悬浮种衣剂的毒性最弱,最强毒性是最弱毒性的10.71倍。吡虫啉各剂型间毒性差异不显著,对蜜蜂均表现为高毒。

Acute Toxicity of Different Formulation Products of Imidacloprid to Apis mellifera

In this study, the acute oral and contact toxicity tests of technical material and different formulation of imidacloprid toApis mellifera adult honey bee were conducted. The results indicated that the 48h-LD50 of oral toxicity tests was between 1.60×10-2 and 0.805 μg a.i./bee, in which 20% imidacloprid ME had highest toxicity in all tested chemicals, 50.31 times the lowest toxicity of 600 g/L imidacloprid FSC; and in contact toxicity test, the 48h-LD50 was between 2.10×10-2 and 0.225 μg a.i./bee, in which 2.15% imidacloprid RB had highest toxicity in all tested chemicals, 10.71 times the lowest toxicity of 600 g/L imidacloprid FSC. Without obvious difference among formulations, all pesticides were of high toxicity to honey bee.