A new host based on the host-recognition kairomone of Telenomus theophila (Hymenoptera:Scelionidae)--Dendrolimus punctatus

Through use of the host recognition kairomone of Telenomus theophila Wu et Chen,the parasitoid T.theophila was induced to oviposit in a nonhost of Dendrolimus punctatus Walker successfully, which had been a new host of T.theophila besides the original hosts of Theophila mandarina and Bombyx mori.The result showed the parasitism ratio of T.theophila in the nonhost being coated with the kairomone was 92.1%,having no significant difference with that in the unnatural host of B.mori.The average duration of life cycle of T.theophila's filial generation in the nonhost was 20.42 days,which was about 2 days longer than that in B.mori.Further studys showed three factors had influenced T.theophila's parasitism, they were the varied concentrations of the kairomone,the parasitoid's parasitism experiences,and the differences of the nonhost eggs.On analysing the effects of them,we concluded that the best way of T.theophila's parasitism in the nonhost was to take use of inexperenienced T.theophila,and anatomized eggs from female D.punctatus adults' ovary, which should be coated with kairomones being diluted from 4 to 128 times.