Relationships between catches in flight and emergence traps of the mountain pine beetle, Dendroctonus ponderosae Hopk. (Col.: Scolytidae)
AbstractDaily emergence of the mountain pine beetle from lodgepole pine trees was monitored in the field by using caged bolts and by counting emergence holes on standing trees. Flying mountain pine beetles, pine engraver beetles and Pityogenes plagiatus knechteli (Swaine) were captured daily in two types of barrier traps. Daily totals of emergence holes and emergence into cages were moderately correlated with daily captures by both types of barrier traps. A simple model of daily emergence was developed based on estimates of brood density, daily proportions of brood adults, and daily proportions of brood adults ready to emerge. Daily catches of pine engravers and P. plagiatus knechteli were highly intercorrelated, but correlations with catches of mountain pine beetle were low for both species. The results are discussed in relation to beetle emergence and flight behaviour.
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