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The analysis of the spatial attack pattern of an endemic Douglas-fir beetle population

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  • The attack spatial pattern of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins was shown to be regular within a given subarea of bark on its host, Pseudotsugae menziesii (Mirb.) Franco. Empirical arguments were advanced which indicated the uniform spacing of attacks was the result of a beetle controlled spacing mechanism dependent on the production of 3-methyl-2-cyclohexen-l-one (MCH-one). Tests of selected treatments in the field showed that virgin females in bolts, screened in such a way that the closest another beetle could approach in any direction was 1.24 cm, were more successful in eliciting attack responses than any other treatment. Field tests also showed that attacking beetles preferred to attack trees with rough bark texture as smooth bark trees were less heavily infested.
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