Pre-overwintering mortality in the larch casebearer, <i>Coleophora laricella</i> (Lepidoptera: Coleophoridae), on western larch in Northern Idaho.

Authors

  • M. W. Brown College of Forestry Wildlife and Range Sciences University of Idaho Moscow, Idaho
  • D. L. Kulhavy College of Forestry Wildlife and Range Sciences University of Idaho Moscow, Idaho

Keywords:

larch casebearer, <i>Coleophora laricella</i>, Lepidoptera, Coleophoridae, western larch

Abstract

During 1976, continuous sampling of the same population cohort showed a 68% mortality in the pre-wintering larch casebearer, <i>Coleophora laricella</i>, in northern Idaho. The major mortality factors were density-independent; these were: premature needle drop caused by the needle diseases <i>Meria laricis</i> and <i>Hypodermella laricis</i> (18%); non-viable eggs (10%); and dislodgment of the eggs from the branch (10%). Other factors were: predation, desiccation, ripening and fall of the needles, intraspecific competition, loss of larvae moving between needles, and larch-willow rust.

References

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Published

2019-08-28

Issue

Vol. 75 (1978): Journal of the Entomological Society of British Columbia

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Articles

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