Abstract
The following two experiments were conducted to investigate the parasitism of Scleroderma nipponica on Monochamus alternatus. In the experiment with using an entomogenous fungus, Beauveria bassiana, the adults of the parasitoid were coated with conidia of the fungus and released under three different conditions; into vials containing a larvae of the beetle, into a field cages containing pine bolts bored by the beetles, and onto the dead pine trees standing in the field. The mortalities of the beetle's larvae were 87% in the vials, 89% in the bolts in the field cages, and 13% in the standing dead trees. In the experiment of mass release of the parasitoid, 800 adults per 1m^2 surface area of the dead pine trees standing in the field were released. The propotion of the empty pupal chambers of the beetle was 50%. This value was remarkably higher than that in parasitoid not-released trees (9%).
