Effects of a neem seed extract against the white pine weevil, <i>Pissodes strobi</i> (Coleoptera: Curculionidae), in Sitka and white-Engelmann spruce.
Abstract
A botanical insecticide based on extracts of seeds from the neem tree, Azadirachta indica A. Juss, was applied systemically to Sitka spruce and white-Engelmann spruce hybrids and sprayed directly onto the leaders of white-Engelmann spruce to test its efficacy in controlling the white pine weevil, Pissodes strobi Peck. Neither treatment had any effect on weevils or damage in the white-Enge1mann spruce, and control was not economical.
Key words: neem; weevil; azadirachtin
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