A nuclear and a cytoplasmic polyhedral virus disease of the spruce budworm.
Bird, F.T.; Whalen,, M.M.
Catalog ID: 34311
Great Lakes Forestry Centre
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Stages in the development of two insect viruses.
Catalog ID: 34310
Catalog ID: 34309
A virus disease of the European pine sawfly, Neodiprion sertifer (Geoffr.)
Catalog ID: 34308