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Interruption of response ofDendroctonus brevicomis to its attractive pheromone by components of the pheromone.
Journal of Chemical Ecology 1981 January
The catch of the western pine beetle,Dendroctonus brevicomis, at an attractive source of racemicexo-brevicomin, racemic frontalin, and myrcene was reduced by surrounding the source with a grid of 48 stations releasing all three compounds together, orexo-brevicomin alone or myrcene alone. Each compound was released at the rate of 2 mg/24 hr/station. The catch at an attractive bolt cut from a tree being colonized byD. brevicomis was not reduced byexo-brevicomin, but was reduced by the combination ofexo-brevicomin, frontalin, and myrcene in one of two tests. When a transect of traps was placed across a 0.81-hectare plot at six of the 48 stations releasing all three compounds, more beetles were caught at outer than at inner traps. More beetles were caught at unbaited traps on trees in a plot when the three compounds were released than when onlyexo-brevicomin or no compounds were released. A few trees were attacked byD. brevicomis in some of the plots. The antiattractant verbenone released from 48 stations at the rate of 4 mg/24 hr/station did not reduce the catch at an attractive tree bolt.
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