You Could Spot the Next Tussock Moth Outbreak: Here's How. Douglas-Fir Tussock Moth Handbook.

摘要

Trees attacked by the Douglas-fir tussock moth quickly lose their beauty. Treetops first become ragged and cuscolored, and some trees turn a bright rust color as needles are destroyed. Then small patches of injured trees may begin to show up in forested areas. In the later stages of a full-blown outbreak, hillsides are often covered with a sickly, brown mantle of dead trees. This happened in eastern Oregon and Washington, and northern Idaho in a major outbreak that occurred between 1972 and 1974. Over a million acres of Douglas-fir and true fir trees were damaged. Forest managers struggled with the problems of timber salvage and what the tussock moth damage would mean to wildlife habitat, loss of esthetic values in recreation and scenic areas, and increased hazard of forest fires.