Effects of a neem seed extract against the white pine weevil, <i>Pissodes strobi</i> (Coleoptera: Curculionidae), in Sitka and white-Engelmann spruce.


  • Ken Naumann Dept. Biology Langara College 100 W. 49th Ave. Vancouver, B.C. V5Y 2Z6
  • Leo Rankin British Columbia Ministry of Forests 200-640 Borland Ave. Williams Lake, B.C. V2G 1R8
  • Don Heppner British Columbia Ministry of Forests 2100 Labieux Rd. Nanaimo, B.C. V9T 6E9
  • Murray Isman Dept. Plant Science University of British Columbia Vancouver, B.C. V6T 1Z4


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