In northern Washington, Douglas-fir is the preferred host, while elsewhere in Washington and Oregon, Douglas-fir, white fir, and grand fir are equally preferred. Management: Several natural controls affect Douglas-fir tussock moth populations. Douglas-fir, white fir, and grand fir are all equally acceptable. The outbreaks happen in cycles and feed off Douglas fir and true fir. Smith), also is occasionally found in the region. This is an important pest species in the eastern United States and feeds on an extremely wide range of shrubs, fruit trees, shade trees and even conifers. -- Distrubution of host type where Douglas-fir tussock moth may be found and location of outbreaks. 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. Once an outbreak begins, viable treatment options decrease significantly. The whitemarked tussock moth, Orygia leucostigma (J.E. Damage usually appears first in the tops of trees and progresses downward, sometimes over several years.
Feeding by the larvae can cause complete defoliation of heavily infested trees. Family: Erebidae Subfamily: Lymantriinae
The insect, during the caterpillar phase, defoliates Yosemite's white fir trees. Douglas-Fir tussock moth has been most prevalent in our landscape trees but is also in forested areas on Cheyenne Mountain and on Rampart Range Road. Adult male (left) and femail (right) Douglas-fir moth. There have been outbreaks of Douglas-fir tussock moths in states such as Idaho, Washington, Oregon, Nevada and California.
Symptoms/Signs: The caterpillar of the Douglas-fir tussock moth is grayish with brightly colored tufts of hair and a shiny black head.There are also two long horns of black hairs behind the head and another at the rear of the body.
Hosts: Douglas-fir, white fir and spruce Figure 8. ), 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. It can also move into our landscape Spruce and Fir trees. Douglas Fir Tussock Moth Orgyia pseudotsugata (McDunnough, 1921).
In eastern 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.
The Douglas-fir tussock moth, a native moth to the Sierra Nevadas, has fluctuating populations that, at times, burst with upsurges. trees, brush, and buildings, but once an outbreak subsides, finding caterpil-lars is difficult. Hosts: Douglas-fir, white fir and spruce Figure 8. Spruce budworm has surged in forested areas such as Cheyenne Cañon, Cheyenne Mountain and along Rampart Range Road. Forest Health Alert Douglas-fir tussock moth (Orgyia pseudotsugata): Outbreak status of a conifer defoliating caterpillar Importance.
Successful management of the Douglas-fir tussock moth depends on carefully monitoring populations within high-hazard stands during the non-outbreak and building phases. Most Douglas-fir tussock moth outbreaks occur east of the Cascade Mountains crest in mixed conifer stands having high proportions of Douglas-fir, grand fir, or white fir.
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