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LIFE HISTORY AND HABITS OF RHABDOPHAGA SP. (DIPTERA: CECIDOMYIIDAE), A GALL MIDGE ATTACKING WILLOW IN MICHIGAN

Published online by Cambridge University Press:  31 May 2012

Louis F. Wilson
Louis F. Wilson
Affiliation:
North Central Forest Experiment Station, East Lansing, Michigan
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Abstract

The taxonomic status of Rhabdophaga sp. cannot be determined until a complete revision of the genus occurs. Rhabdophaga sp. on Salix discolor Mühl. is univoltine in Michigan. Adults emerge in mid-April, and shortly afterward deposit numerous eggs on the setaceous undersurface of emerging willow leaves; larval eclosion occurs between 1 and 2 weeks later. Head capsule measurements reveal three larval instars. The first-instar larva bores into the stem until it reaches the pith. Gall development begins about mid-June shortly after the second instar appears. The third-instar larva overwinters in the gall and the pupa appears in early April. The prolate gall is found on the proximal ends of young willow shoots; heavily galled shoots usually die.

Type
Articles
Information
The Canadian Entomologist , Volume 100 , Issue 2 , February 1968 , pp. 184 - 189
Copyright
Copyright © Entomological Society of Canada 1968

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References

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