Effects of neem seed extract on the growth of fungal associates of the mountain pine beetle

R. J. Nevill, L. Safranyik


We investigated the fungicidal activity of neem seed extract, activc ingredient azadirachtin, to Ophiostoma clavigerum (Robins. Jeff & Davids) and Ophiostoma ips (Rumb.), the fungal associates of the mountain pine beetle, Dendroctonus ponderosae Hopk. When added to malt extract agar, concentrations of 100 ppm significantly reduced the growth of both fungal associates and concentrations above 250 ppm killed both fungi.

Key words: Azadirachtin; bluestain fungi; Coleoptera; Scolytidae

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