THE INFLUENCE OF LOGGING ON DOUGLAS FIR BEETLE POPULATIONS

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Abstract
All species of bark beetles of economic importance prefer to attack freshly-killed host material. Logging slash, wind-throw, and fire-killed timber provide ideal breeding grounds for bark beetles. A few species, mostly in the Dendroctonus group, are able to attack and kill living trees. When beetles in this group, raised in preferred host material, cannot find any or enough freshly-killed trees, logs, or slash to enter, they may attack living trees. In the interior of British Columbia, infestations of the Douglas fir beetle can often be traced to logging disturbance.The regulation or control of bark beetle populations involves several generally accepted principles:(a) The removal or destruction of beetle broods in infested material in time to prevent the new adult beetles from emerging to attack fresh material.(b) Continuous logging in time and area will tend to keep the beetles in the slash.(c) Keep suitable breeding material to a minimum.(d) The use of trap trees or trap logs for remedial action in trouble areas.
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