Canadian Forest Service Publications

Field development of Bacillus thuringiensis Beliner in Eastern Canada, 1970-1980. 1984. Smirnoff, W.A.; Morris, O.N. Pages 238-247 in J.S. Kelleher and M.A. Hulme, editors. Biological control programmes against insects and weeds in Canada 1969-1980. Commonwealth Agricultural Bureaux, Slough, England.

Year: 1984

Issued by: Laurentian Forestry Centre

Catalog ID: 14429

Language: English

Availability: PDF (request by e-mail)

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Bacillus thuringiensis var. kurstaki, (B.t.) is a bacterium registered in Canada for control of agricultural and forest pests. The registered preparations, derived from cultures of the serotype 3a, 3b, are a mixture of dormant endospores and endotoxin crystals suspended in a liquid carrier. Forest protection agencies have found spraying to be more expensive with B.t. than with chemical insecticides, yet B.t. remains a desirable alternative because its toxicity is confined to lepidopterous larvae and its use rarely arouses public antagonism. The Canadian experience of B.t. aerially applied against budworm, Choristoneura fumiferana (Clem.) is that its efficacy is variable. Field trials have indicated differences among commercial products, varying efficacies among field formulations, uncertainties over dosages, technical difficulties in spraying methods, weaknesses in means of measuring deposits, and inadequacies in techniques of assessing the agent's effectiveness in reducing larval populations and protection foliage. Research into these problems was conducted in the 1970s, in two main areas, by two laboratories of the Canadian Forestry Service (CFS): (a) in Quebec, where the Laurentian Forest Research Centre collaborated with the Qu├ębec Department of Lands and Forests, and (b) in Ontario and the Atlantic Provinces, where the Forest Pest Management Institute participated in provincial-federal field trials. This paper collates the results from both laboratories.