Insect and Mite Associates Ofscolytus Multistriatus(coleoptera: Scolytidae) in California

Thirty-four species of insects associated with Scolytus multistriatus (Marsham) were reared or collected from several species of elm collected throughout California. Few of these species occurred in large numbers and many of their ecological roles in this subcortical habitat are unknown. Predators were uncommon; only 6 species of parasitic Hymenoptera were reared, 3 of which were not previously known from California. One, Dendrosoter protuberans (Nees), had previously been released for biological control of S. multistriatus only as far west as Colorado. The most abundant insect associate reared from northern California, Cheiropachus quadrum (F.), exhibited a maximum percentage parasitism of 2%. Seven species of mites, including 2 new species, were also collected in association with S. multistriatus .