Pre-attack systemic applications of a neem-based insecticide for control of the mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae)

Ken Naumann, Leo J. Rankin


An insecticide from neem, Azadirachta indica A. Jussieu, seeds, applied to the xylem of lodgepole pine trees at 0.05 g of the active ingredient, azadirachtin per cm diameter at breast height, reduced larval numbers and almost totally prevented successful development to adulthood of the mountain pine beetle, Dendroctonus ponderosae Hopkins, whether applied before or after trees were attacked. Smaller amounts of azadirachtin were less effective. Neem was effective up to the top of the beetle attack zone (4 m), indicating that the active ingredient was effectively translocated. The treatment window for applying neem systemically against this pest is longer in duration than previously thought, and pre-attack treatments can be used to create lethal trap trees.

Key words: neem; mountain pine beetle; pre-attack systemic application

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