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Life History and Some Habits of the Pine Gall Weevil, Podapion gallicola Riley, in Michigan

Published online by Cambridge University Press:  31 May 2012

Louis F. Wilson
Louis F. Wilson
Affiliation:
Lake States Forest Experiment Station, Forest Service, U.S.D.A., East Lansing, Michigan, U.S.A.
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Abstract

The pine gall weevil has a 3-year life cycle on red pine (Pinus resinosa Ait.) in Michigan. Adults oviposit from June to August, depositing 1 to 10 eggs in a niche chewed in the bark of a branch internode. Larvae first emerge in August, feed as a group toward the cambium, and then radiate out along the xylem. Head capsule measurements from 1585 larvae indicate that there are three larval instars. Gall development begins in June of the second year, shortly after the larvae begin the second instar. The third instar commences in June of the third year. Pupation occurs in May of the fourth season; adult emergence follows in June. Overwintering occurs in the egg stage or in the three larval instars. Adults do not overwinter, and apparently three distinct broods occur in Michigan.

Type
Articles
Information
The Canadian Entomologist , Volume 97 , Issue 9 , September 1965 , pp. 962 - 969
Copyright
Copyright © Entomological Society of Canada 1965

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