Monitoring and dynamics of a Douglas-fir beetle outbreak in Jasper National Park, Alberta
Abstract
A Douglas-fir beetle outbreak in Jasper National Park was discovered at 10 sites in 1991, and has since expanded to 30 sites in 1992, and 55 sites in 1993. Individual sites surveyed in 1993 contained from 3 to more than 200 attacked trees covering areas of 10 m2 to 1 km2 respectively. Sites containing pheromone population monitoring funnel traps contained significantly more attacked live trees than those sites without pheromone traps, suggesting that the traps attract larger beetle populations to the site. Diameter measurements indicated that in the initial years (-1990) of the infestation, larger diameter trees were attacked more commonly. In 1993, freshly attacked green trees were of a smaller diameter.
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