Persistence of Bacillus thuringiensis in Two Formulations Applied by Helicopter Against the Western Spruce Budworm (Lepidoptera: Tortricidae) in North Central Oregon

Author： Beckwith Roy C.   Stelzer Milton J.  

Publisher： Entomological Society of America

ISSN： 1938-291X

Source： Journal of Economic Entomology, Vol.80, Iss.1, 1987-02, pp. : 204-207

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