Biocontrol of the Overwinter Monochamus alternatus with Dastarcus helophoroides
To explore the control effects of Dastarcus helophoroides on overwintering larvae and pupae of Japanese pine sawyer Monochamus alternatus and discuss the biocontrol techniques and methods in field,experiments in door and field were carried out.The adults and eggs of D.helophoroides were released on the logs infested by the overwintering M.alternatus in the indoor experiment.The four treatments were conducted in field:releasing D.helophoroides aduhs onto the dead erect trees,releasing adults onto the cut-down dead trees,releasing adults uniformly into field,and releasing eggs of D.helophoroides onto the cut-down dead trees.The results showed that when the ratio of the number of D.helophoroides adults released to the number of holes bored by larvae of M.alternatus (HBL) was 1 ∶ 1 in the indoor experiments,the control effect was 91.23％ ; and when the proportion of the number of eggs released to the number of HBL was 16∶ 1,the control effect was 91.18％.In the field tests,when the ratio of the number of D.helophoroides adults released to the quantity of HBL was 1∶ 1,the control effect on the erect trees was 66.02％ and the control effect on the cut-down dead trees was 91.16％.In the treatment of releasing adults uniformly into field,the control effect of the second year was 83.68％ at the quantity of 3 750 adults per 1 hm2,and the best ratio of release was 0.547 5∶1.The control effect was 91.48％ when ratio of eggs released to the numbers of HBL was 16∶1 on the cut-down dead trees.It is concluded that D.helophoroides is the efficient natural enemy to the overwintering larvae and pupae of M.alternatus,and releasing eggs onto the cut-down dead trees is the best way to control this pest.
国家科技期刊平台
NSTL
万方数据
维普
