The Douglas-fir tussock moth
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The Douglas-fir tussock moth a synthesis by United States. Forest Service.

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Published by Dept. of Agriculture, Forest Service : for sale by the Supt. of Docs., U.S. Govt. Print. Off. in Washington .
Written in English


  • Douglas fir tussock moth

Book details:

Edition Notes

Statementedited by Martha H. Brookes, R. W. Stark, Robert W. Campbell
SeriesTechnical bulletin - Dept. of Agriculture ; no. 1585, Technical bulletin (United States. Dept. of Agriculture) -- no. 1585
ContributionsBrookes, Martha H, Stark, R. W., 1922-, Campbell, Robert W
The Physical Object
Paginationxvii, 321 p. :
Number of Pages321
ID Numbers
Open LibraryOL17951951M

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Douglas-fir tussock moth (Orgyia pseudotsugata) is a native defoliator of spruce, Douglas-fir (Pseudotsuga menziesii) and true firs (Abies spp.), though will rarely feed on planted Colorado blue spruce in urban areas. The moth is a native species found throughout mixed-conifer forests in the western United States and southern British Columbia. The Douglas-fir tussock moth creates snags and down wood by severely defoliating and causing the death of all sizes of true fir and Douglas-fir trees. It also interacts with other disturbance agents, especially bark beetles, to cause host tree mortality. Successful management of the Douglas-fir tussock moth depends on carefully monitoring populations within high-hazard stands during the non-outbreak and building phases. Once an outbreak begins, viable treatment options decrease significantly. Orgyia pseudotsugata. Pest description and damage The adult male is brown to gray and about 1 inch across and flies during the day in search of the wingless female moth. The larvae feed on pine needles and the mature larvae are about an inch long, hairy, gray or light brown, with black heads.

Hosts: Douglas-fir, white fir and spruce Figure 8. Adult male (left) and femail (right) Douglas-fir moth. Symptoms/Signs: The caterpillar of the Douglas-fir tussock moth is grayish with brightly colored tufts of hair and a shiny black are also two long horns of black hairs behind the head and another at the rear of the body. Forest Health Alert Douglas-fir tussock moth (Orgyia pseudotsugata): Outbreak status of a conifer defoliating caterpillar Importance. The Douglas-fir tussock moth (DFTM) is a defoliating caterpillar that can severely damage Douglas-fir, true fir, and spruce trees in the western United States. In eastern. The Douglas-fir tussock moth is a native insect found throughout the range of its Douglas-fir North Idaho removed approximately 14 million Douglas and true fir hosts in the western states and British Columbia. It is one of many conifer-feeding insects that contribute to . The Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), is an important defoliator of spruce, Douglas-fir, true fir and other conifers in the Rocky Mountain region. Feeding by the larvae can cause complete defoliation of heavily infested trees.

The Douglas-fir tussock moth is a common and periodically destructive solitary defoliator. Occasionally, localized outbreaks occur on individual or small groups of Douglas-fir or spruce in urban settings both on the coast and in the interior. Severe defoliation by the tussock moth may result in tree mortality, top-kill or weakened trees, making. Douglas-fir tussock moths are defoliators—they eat the leaves off of plants. More precisely, immature caterpillars climb to the top of the tree or building where they hatched, spin a silk web to sail on, float on the wind until they land, and eat any leaves they can find.   The sex pheromone of the Douglass-fir tussock moth Orgyia pseudotsugata (McDunnough) has been isolated and identified as (Z)heneicosenone. This compound and its E isomer have been synthesized and are highly potent in laboratory bioassays and field by: The Douglas-fir tussock moth is a native insect in the low-lying, dry belt Douglas-fir regions of southern British Columbia. It is not an introduced species. It feeds primarily on Douglas-fir, and occasionally on ponderosa pine and western larch. Ornamental spruce and pine may also be affected in urban.