Canadian Forest Service Publications
Diseases of the larch sawfly, Pristiphora erichsonii, in Quebec. 1968. Smirnoff, W.A. Journal of Invertebrate Pathology 10: 417-424.
Issued by: Laurentian Forestry Centre
Catalog ID: 16021
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Diseases of the larch sawfly, Pristiphora erichsonii, a major defoliator of larch stands, were studied at several locations in Quebec. Thirty-two species of microorganisms were isolated. A rickettsialike organism and a microsporidian were considered as obligate parasites. The other microorganisms were either potential or facultative pathogens or saprophytes. An attempt was made to demonstrate the pathogenicity of the principal causal agents and the interference, interaction, or synergism of the numerous pathogens isolated. Results suggested that the number of microorganisms recorded played an important role in the decline of larch sawfly populations.