Environmental Influences on Dispersal of Trypodendron lineatum (Coleoptera: Scolytidae)

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Abstract
The influence of wind and site parameters on dispersal of Trypodendron lineatum (Olivier) were evaluated using mark–recapture experiments. Beetles were released simultaneously from a windward and leeward side of a forest margin in a valley. With long-distance flight emphasized and no semiochemical-baited traps placed within 200 m of either release site, population movement (i.e., trap capture) from both release sites was predominantly downwind. Beetles also flew across the valley and were recaptured in traps on the opposite facing slope at a frequency of 38% of all recaptured beetles during the first four releases. Greater than three times as many beetles were recaptured within forested versus open settings, and is considered to be due mostly to the calmer wind conditions under the forest canopy. Such conditions appear to facilitate better flying and increased response to olfactory stimuli for T. lineatum . Management implications of these results are discussed.

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