两种重要储粮害虫的无公害防治技术研究

通过３种虫生真菌、2种苏云金杆菌粉剂(Bt-1和Bt-2)及48%乐斯本乳油对生活在小麦中的谷蠹、长角扁谷盗进行毒力试验，结果表明：Bt-1粉剂对两种储粮害虫具有较高的毒力，对谷蠹LD50为15.75ug/g，对长角扁谷盗LD50为8.06ug/g；三种虫生真菌对这两种害虫侵染力较弱，最高校正死亡率仅为55.0%。48%乐斯本乳油对两种储粮害虫的熏蒸效果较好，在0.80ml/L浓度下，谷蠹、长角扁谷盗死亡率均达到100.0%。

Study on Socially Harmless Controlling Technologies on Stored Grain Insect Pests

In this paper, the virulence of three entomogenous fungi strains (B-99, Pfu02, Nr-98-1), Bt and Chlorpyrifos EC to Rhizopertha dominica and Cryptolestes minutus living in wheat were tested. The result shows as follows: The Bt-1 WP has strong virulence to this two pest species. LD50 to R.dominica is 15.75ug/g, which of C. minutus is 8.06ug/g. The highest mortality is only 55% when the two pest species were treated with three entomogenous fungi strains in three days later; the result indicates that the virulence of three fungi strains to the two pest species are poor. The suffocating effects of 48% Chlorpyrifos to the two pest species are good, the death rates of R.dominica and C. minutus reached 100.0 percent at the density of 0.80ml/L.