食品级惰性粉对三种储藏物害虫生长发育的影响

应用粉剂药膜法,一种食品级惰性粉——4号粉相应剂量处理赤拟谷盗Tribolium castaneum(Herbst)、烟草甲Lasioderma serricorne(Fabricius)、锯谷盗Oryzaephilus surinamensis(Linnaeus)的卵和1龄幼虫,赤拟谷盗、锯谷盗、烟草甲的卵平均孵化率均在97%以上,处理后卵孵化的1龄幼虫平均死亡率均在96%以上;处理3种害虫的1龄幼虫其平均死亡率均在99%以上。结果表明食品级惰性粉对3种试虫卵的孵化率几乎没有影响,但对其1龄幼虫有较好的防治效果。通过混粮法应用正交试验研究发现,惰性粉剂量和小麦含水量对赤拟谷盗F1代防治效果均有显著影响。当小麦处于安全水分时(含水量12%¹4%),10014%),100¹50 mg/kg 4号粉能有效防治赤拟谷盗F1代。

Effect of food-grade inert dust on the growth and development of three insect pests of stored-grain

The eggs and first instar larvae of Tribolium castaneum （Herbst）, Lasioderma serricorne （Fabricius） and Oryzaephilus surinamensis （Linnaeus） were treated with a food-grade inert dust （No. 4） using a dry, residual film bioassay. The hatching rates of all three species was over 97% , mortality of just hatched larva over 96% and mean mortalities of first instar larvae over 99%. The results show that the food grade inert dust had no effect on the hatching rate of these three insects, but killed almost 100% of first instar larvae. The combined influence of inert dust and wheat moisture content on a T. castaneum F1 generation was investigated using orthogonal tests; the results show that both factors significantly inhibited the development of F1 generation. When the moisture content of wheat was between 12% and 14% , 100 mg/kg to 150 mg/kg of inert dust can effectively inhibit the development of the F1 generation of T. castaneum.