Canadian Forest Service Publications
A nuclear and a cytoplasmic polyhedral virus disease of the spruce budworm. 1954. Bird, F.T.; Whalen, M.M. Canadian Journal of Zoology 32:82-86.
Issued by: Great Lakes Forestry Centre
Catalog ID: 34311
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The spruce budworm, Choroneura fumiferana (Clem.), is susceptible to two polyhedral virus diseases. The first, previously described, is characterized by the formation of polyhedra within the nuclei of tracheal matrix, fat, hypodermal, and blood cells. The polyhedra contain mostly rod-shaped panicles 260 X 28 millimicrons. The second is a new type and is characterized by the formation of polyhedra in the cytoplasm of mid-gut cells. The polyhedra contain only spherical particles from 28 to 80 m,u in diameter. Both diseases occurred in the salllc insect but it was possible to separate the cytoplasmic disease from the lluclear disease by extracting groups of the cytoplasmic polyhedra from thc mid-gut with a micromanipulator before thc nuclear disease developed.