Toxicity measurement of spinosad and phloxine B on oriental fruit fly <I>Bactrocera dorsalis</I>

Abstract

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).