Canadian Forest Service Publications

Aerial spraying of a Bacillus thuringiensis - chitinase formulation for the control of spruce budworm. 1973. Smirnoff, W.A.; Fettes, J.J.; Desaulniers, R. s.n., S.l. Information Report Q-X-31.

Year: 1973

Issued by: Laurentian Forestry Centre

Catalog ID: 16080

Language: English

Series: Information Report (LFC - Qu├ębec)

Availability: PDF (download)

Mark record


A 10,000 acre stand of mature balsam fir, in Temiscouata County, Quebec, which had a spruce budworm population of about 21 larvae per 18-inch branch tip was sprayed with a Bacillus thuringiensis + chitinase formulation. Aerial spraying was carried out by 3 TBM aircraft between June 4-7, 1972, when insect development was at the peak of the third instar. Where the quantity of B. thuringiensis colonies per cm2 was higher than 77 and spray deposit higher than 0.4 gal (US)/acre, larval mortality was between 84% and 93%. Mortality in the control plot was between 39% and 53%. Foliage protection was 47%. The results indicate the possibilities of using B. thuringiensis + chitinase to control spruce budworm infestations.