Woodwasps (Siricidae) in Conifers and the Associated Fungus, Stereum chailletii, in Eastern Canada
Abstract:Sirex juvencus L., Urocerus albicornis F., U. gigas flavicornis F., and Xeris spectrum I., woodwasps were found in coniferous forests in New Brunswick and Nova Scotia. The dominant species, S. juvencus, chiefly attacked weakened and newly dead balsam fir. Its life cycle, normally 2 years, was completed in 7 months when the woodwasps were reared indoors (22° C) in balsam fir logs. Only males were produced from eggs laid by unmated S. juvencus. Stereum chailletii (Pers.) Fr. was the only fungus isolated from the intersegmental sacs of the Sirex and Urocerus species. It was associated with each developmental stage of female S. juvencus. Larvae hatched from eggs laid by mated and unmated S. juvencus did not develop beyond the first instar when S. chailletii was not introduced into the wood during oviposition. Oidia of S. chailletii were not found in the vestigial intersegmental sacs of X. spectrum.
Document Type: Journal Article
Affiliations: Research Officer, Forest Entomology and Pathology Laboratory, Fredericton, N. B.
Publication date: 1966-03-01
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