Abstract
AbstractThe distribution of the yew big bud mite,Cecidophyopsis psilaspis(Nalepa), a pest causing severe damage to Pacific yew,Taxus brevifoliaNutt., was determined within British Columbia. From 1992 to 1994, vegetative and reproductive buds on branch samples collected from 38 interior and 43 coastal populations of Pacific yew were examined for the occurrence of the mite. Mite damage was characterized by marked swelling and browning of both vegetative and reproductive buds. Interior Pacific yew populations were found to be mite free, whereas coastal yew populations were mite infested, except at three high-elevation (>700 m) coastal locations which were apparently mite free. At three other sites, individual trees without symptoms of mite attack did harbour low-density, nondamaging mite populations. The hypothesis that this mite is indigenous is less supported than the hypothesis that it was introduced to British Columbia on English yew,Taxus baccataL., and is limited to its present distribution by climatic and mountain barriers.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
