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BIOLOGICAL STUDIES OF BUD MINING SAWFLIES, PLERONEURA SPP. (HYMENOPTERA: XYELIDAE), ON WHITE FIR IN THE CENTRAL SIERRA NEVADA OF CALIFORNIA: I. LIFE CYCLES, NICHE UTILIZATION, AND INTERACTION BETWEEN LARVAL FEEDING AND TREE GROWTH1

Published online by Cambridge University Press:  31 May 2012

C. P. Ohmart  and
D. L. Dahlsten
C. P. Ohmart
Affiliation:
Division of Biological Control, University of California, Berkeley
D. L. Dahlsten
Affiliation:
Division of Biological Control, University of California, Berkeley
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Abstract

The previously unknown biologies of three species of bud mining sawflies occurring in the central Sierra Nevada Mountains are compared. All three species oviposit in the buds of white fir, Abies concolor, but in different parts of the bud. Each has a different ovipositional posture as well. The first instar of each species mines the bud in a characteristic manner; later instar larval behavior is not distinguishable. The larvae cannot be separated morphologically, but the adults are easily recognized by their genitalia. At moderate population levels competition does not appear to be a major limiting factor even though the three species occupy the same niche. The feeding of Pleroneura aldrichi, P. koebelei, and P. lutea appears to have little if any effect on the host tree.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 7 , July 1977 , pp. 1001 - 1007
Copyright
Copyright © Entomological Society of Canada 1977

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References

Burdick, D. J. 1961. A taxonomic and biological study of the genus Xyela Dalman in North America. Univ. Calif. Publs Ent. 17: 285–355.Google Scholar
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