Potential insect vectors of the black stain root disease pathogen on Southern Vancouver Island
Abstract
Three species of beetles suspected of vectoring the black stain root disease pathogen (Leptographium wageneri) were found at two locations on Vancouver Island, British Columbia. The most commonly trapped specie was Hylastes nigrinus (Scolytidae) (691) followed by Steremnius carinatus (Curculionidae) (64) and Pissodes fasciatus (Curculionidae) (31). These insects may be vectors of the fungus that induces black stain root disease but confirmatory studies are needed. Douglas-fir resin at 1% or 10% in 95% ethanol attracted the most insects, whereas 95% ethanol or resin alone attracted the fewest. Pitfall traps captured significantly more of all three species than window traps. and were easier to maintain.
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