Toxicity measurement of spinosad and phloxine B on oriental fruit fly Bactrocera dorsalis

In order to choose the best insecticide for fruit fly protein hydrolysate baits in field,laboratory tests were taken to assess the stomach toxicity of spinosad and phloxine B with torula yeast protein hydrolysate on oriental fruit flies,Bactrocera dorsalis (Hendel) female and male adults.Median lethal concentration values of spinosad and phloxine B on B.dorsalis male and female adults at 5 h were 12.757 0 mg/kg,13.953 5 mg/kg;779.937 8 mg/kg,826.625 9 mg/kg respectively.Median lethal time of spinosad was 4.190 4 h(females) and 4.973 0 h(males) at 16 mg/kg and 100 mg/kg;The median lethal time of spinosad was 2.487 7 h(females) and 2.675 5 h(males).For phloxine B,at 630 mg/kg the median lethal time was 5.350 7 h(females) and 4.946 2 h(males),and at 1,000 mg/kg the median lethal time was 4.765 0 h(females) and 4.571 5 h(males).