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MORTALITY OF EGGS OF THE LARCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE) IN OREGON

Published online by Cambridge University Press:  31 May 2012

R.B. Ryan
R.B. Ryan
Affiliation:
Forestry and Range Sciences Laboratory, Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, La Grande, Oregon USA 97850
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Abstract

Eggs of the larch casebearer, Coleophora laricella (Hübner), were sampled for 6 years at 3 sites in Oregon to determine causes of mortality. Infertility was of minor importance. Predation by Deraeocoris diveni Knight, Phytocoris calli Knight (Heteroptera: Miridae), and perhaps other predators caused up to 28.4% mortality. Up to 58.5% of the remaining embryos died before or at the time of hatching, probably as a result of high temperatures.

Résumé

Les oeufs du porte-case du mélèze, Coleophora laricella (Hübner), ont été échantillonnés pendant 6 ans à 3 sites en Oregon afin de déterminer les causes de mortalité. L'infertilité s'est avérée d'importance mineure. La prédation par Deraeocoris diveni Knight, Phytocoris calli Knight (Heteroptera: Miridae), et possiblement d'autres prédateurs, a causé jusqu'à 28,4% de mortalité. Jusqu'à 58,5% des embryons restants sont morts avant ou lors de l'éclosion, probablement dû aux températures élevées.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 8 , August 1985 , pp. 991 - 994
Copyright
Copyright © Entomological Society of Canada 1985

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