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Instar development of the Douglas-fir tussock moth in relation to field temperatures.Author(s): Roy C. Beckwith; David G. Grimble; Julie C. Weatherby
Source: Res. Note PNW-RN-512. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 6 p
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
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DescriptionInstar development is recorded for the Douglas-fir tussock moth (Orgyia pseudotsugata) for two different elevations in the Boise National Forest, Idaho, in 1991. The percentage of the population by instars is associated with accumulated degree-days after eclosion, which can be used to predict the proper timing for spray application. For all practical purposes, areas can be released for spraying when third instars are initially found.
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CitationBeckwith, Roy C.; Grimble, David G.; Weatherby, Julie C. 1993. Instar development of the Douglas-fir tussock moth in relation to field temperatures. Res. Note PNW-RN-512. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 6 p
KeywordsDouglas-fir tussock moth, insects, larval development, aerial application
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