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LIFE HISTORY AND HABITS OF THE PINE CONE WILLOW GALL MIDGE, RHABDOPHAGA STROBILOIDES (DIPTERA: CECIDOMYIIDAE), IN MICHIGAN

Published online by Cambridge University Press:  31 May 2012

Louis F. Wilson
Louis F. Wilson
Affiliation:
North Central Forest Experiment Station, Forest Service, U.S. Department of Agriculture
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Abstract

The pine cone willow gall midge is univoltine in Michigan. Adults emerge from the galls on Salix eriocephala Michx. and other willows on warm days in late April or early May. Eggs are laid singly on the leaves and stems of the host. Head capsule measurements indicate three larval instars. The first-instar larva emerges in early May and penetrates the soft tissues at the base of the developing shoot tip. Shortly thereafter, the gall begins to develop and is about half grown by the time the second-instar larva appears in late May. The last-instar larva appears in July. Before overwintering, the larva constructs a cocoon which may or may not be closed at the top. Pupation occurs in early April. Numerous inquilines and parasites inhabit the developing and mature gall.

Type
Articles
Information
The Canadian Entomologist , Volume 100 , Issue 4 , April 1968 , pp. 430 - 433
Copyright
Copyright © Entomological Society of Canada 1968

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