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First and foremost, two situations need to be addressed: root disease centers and overstocked stands. However, many stresses are related to stand management practices. Some of these, such as environmental stresses, are not possible to control. To maintain mountain pine beetles at their normal levels, predisposing factors for outbreak must be removed. As such, the death of a few trees on your property doesn't necessarily mean an epidemic is getting started check your trees for root disease symptoms. Mountain pine beetles are a natural part of western ecosystems, and for this reason will never be completely eradicated (nor should they be, as they serve to create small stand openings which are important for biodiversity of both flora and fauna).

More importantly, infestations can be prevented by thinning stands before crown closure, an operation that not only increases the vigor of the residual stand, but also prevents the spread of an outbreak if individual trees have been attacked. This is because outbreaks expand on a tree to tree basis where the incoming beetles switch their attacks from a recently attacked-stem to the next largest tree. Once a mountain pine beetle outbreak begins to spread, it can be stopped by thinning the stand ahead of the edge of the outbreak. It is possible to prevent infestation with penetrating sprays on individual, high value trees such as those in campgrounds and near houses, but they need to be applied before the tree is infected and the cost of such treatments is prohibitive for any large-scale application. This course of action was chosen after thoroughly exploring direct control measures for nearly a century and arriving at a simple conclusion: They don't work. spraying, felling, burning) and towards prevention of outbreaks. In the northwestern U.S., USDA Forest Service states that the focus has shifted from using pesticides to taking preventive measures:Ĭontrol methods have shifted away from direct control (e.g. What is the latest method of eradication for the mountain pine beetle, Dendroctonus ponderosae, that is rampant in western Canada? Keywords: Trees-Diseases and pests, Pesticides, Insect pests-Control

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