Canadian Forest Service Publications

Essai d'une préparation ultra-concentrée de Bacillus thuringiensis contre la tordeuse des bourgeons de l'épinette. 1982. Smirnoff, W.A.; Juneau, A.; Valéro, J.R. Canadian Journal of Forest Research 12: 105-107.

Year: 1982

Issued by: Laurentian Forestry Centre

Catalog ID: 14333

Language: French

Availability: PDF (request by e-mail)

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Previous studies led to the development of Bacillus thuringiensis formulations providing dispersion of the required 20 x 109 international units (IU) of B. thuringiensis in a final volume of 4.7 L/ha against spruce budworm. Althought the use of these formulations was successful, it seemed essential to reduce their cost particularly by developing more concentrated formulations. Thus, aa formulation (futura) providing dispersion of the same 20 x 109 IU in a final volume of 2.5 L/ha was developed. In 1979, the physical properties of this formulation were tested for dispersion and, in 1980, it was dispersed over five 40-ha forest blocks infested with spruce budworm. The futura formulation showed the same possibilities as the preceding ones in terms of quality of dispersion, larval mortality, and foliage protection.