Complexes of xylophagous insects in pine cultures contaminated by pine fungus.
Investigations in 1982-85 in an intensifying focus of root fungus [Heterobasidion annosum] on pine [Pinus] growing near a cement works in the Novosibirsk region of the USSR showed the presence of 16 insect pests on the trunks. The chief ecological groupings included Blastophagus piniperda [Tomicus piniperda], B. minor [T. minor], Phaenops cyanea, Monochamus galloprovincialis and less frequently Paururus juvencus [Sirex juvencus]. Spring and spring-summer phenological complexes were predominant, and T. piniperda was the chief species, infesting 78% of pines. While it appeared that trees deteriorated without insect participation, dying-out without such participation was very rare. Insects attacked chiefly much-weakened and dying trees.