The Effectiveness of the Aerial Application of Orthene ® Against Spruce Budworm at Petawawa Forest Experiment Station During 1974
Problem Addressed: Spruce budworm epidemic in eastern Canada
Goal(s)/Objective(s): Determine the effectiveness of aerial application of Orthene®
Key Findings: Orthene® was shown to be an effective treatment against the spruce budworm larvae on balsam fir and white spruce in terms of population reduction and foliage protection
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- Armstrong, J.A.
Canadian Forestry Service - Nigam, P.C.
Canadian Forestry Service
Orthene® (O,S-dimethyl acetylphosphoramidotioate) was applied at 0.21, 0.42 and 0.63 kg/ha (3.0, 6.0 and 9.0 oz AI/acre) in aqueous solution emitted at 2.34, 4.67 and 9.35 l/ha (0.25, 0.50 and 1.0 gpa) to balsam fir and white spruce trees infested with the spruce budworm. Analysis of the results showed that budworm population reduction and foliage protection of white spruce was possible with a deposit of 0.21 kg/ha (3.0 ox AI/acre) in a volume of 4.67 l/ha (0.5 gpa). Population reduction and foliage protection was possible on balsam fir with a deposit of 0.19 kg/ha (2.75 oz AI/acre) Orthene emitted at a single application of 4.67 l/ha (0.5 gpa) or a double application at 2.34 l/ha (0.25 gpa).
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