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Publication Information

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Title: Instar development of the Douglas-fir tussock moth in relation to field temperatures.

Author: Beckwith, Roy C.; Grimble, David G.; Weatherby, Julie C.;

Date: 1993

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)

Description: Instar 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.

Keywords: Douglas-fir tussock moth, insects, larval development, aerial application

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
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Beckwith, 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

 


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