Abstract:

The branches of Broussonetia papyrifera were treated with Cynancum komalovii total alkaloids and Melia azedarach fruit extracts as the food of the beetle (Apriona germari Hope), the effects of C.komalovii total alkaloids and M.azedarach fruit extracts on their oviposition and egg hatch were investigated and compared. The testing paired beetles were put into the plastic containers with diameter of 25 cm and 25 cm in height and covered with iron screen. The experiments were carried in laboratory at the room temperature. During 15 d testing period the average egg numbers laid per d of the treated seven pairs of the beetles in the two treated groups, which were fed on branches treated by 300 μg·mL^-1 C.komalovii total alkaloids and 100 μg·mL^-1 M.azedarach fruit extracts were 3.53±4.18 and 6.73±3.82 respectively and in the control group it was 13.73±2.90. t-test showed that there were significant differences between the treated and control groups in average egg number per d. The Cynancum komalovii total alkaloids and the Melia azedarach fruit extracts affected egg hatching in A.germari, which were shown in two aspects:(1) The egg hatch rate was lowered. the final egg hatch rate in the group of 300 μg·mL^-1 C.komalovii total alkaloids and in the group of 1000 μg·mL ^-1 M.azedarach fruit extracts were 77.36%,87.12% respectively, and that in control group was 99.5%. (2) The time period needed for egg hatch was increased. In the group of 300 μg·mL^-1 C.komalovii total alkaloids, the time for egg hatch was 17d, in the group of 1000 μg·mL^-1 M.azedarach fruit extracts it was 15 d and that was 11 d in the control group.In brief, in the experiment it was shown that oviposition and egg hatch were significantly inhibited for the adults of Apriona germari, which had been fed with C.komalovii total alkaloids and M. azedarach fruit extracts. To develop new ways of behavior Manipulation for Insect Pest Management with the extracts of C.komalovii and M.azedarach were discussed with resources of the two plant species in China in the paper.

Key words: Cynancum komalovii<, .i>, Al. Iljinski, Melia azedarach Linn., extracts, Apriona germari Hope, oviposition, hatch