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AN OUTBREAK OF A SAWFLY, PAMPHILIUS PHYLLISAE (HYMENOPTERA: PAMPHILIIDAE), ON NORTHERN RED OAK, WITH NOTES ON LARVAL MORPHOLOGY

Published online by Cambridge University Press:  31 May 2012

D. C. Eidt  and
J. O. Nichols
D. C. Eidt
Affiliation:
Forest Research Laboratory, Department of Fisheries and Forestry, Fredericton, New Brunswick
J. O. Nichols
Affiliation:
Department of Forests and Waters, Commonwealth of Pennsylvania, Harrisburg
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Abstract

An outbreak of a sawfly, Pamphilius phyllisae Middlekauff, was discovered on northern red oak at Linn Run State Park, Pennsylvania, in 1964. The outbreak was unusual and probably unique because this previously unknown species suddenly attained populations of over 1 million ultimate instar larvae per acre. The reasons for the outbreak are not known but it arose near the end of a period of abnormally low precipitation and at a time when nearly complete encapsulation of parasites by the sawfly larvae was observed. The insect is confined to northern red oak, Quercus rubra L., and has a life cycle of 1, 2, or more years of which about 6 weeks are spent on the host tree. The life history, the history of the infestation, and the immature stages are described.

Type
Articles
Information
The Canadian Entomologist , Volume 102 , Issue 1 , January 1970 , pp. 53 - 63
Copyright
Copyright © Entomological Society of Canada 1970

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