Field response ofDendroctonus brevicomis toexo-brevicomin,frontalin, and myrcene released at two proportions and three levels |
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Authors: | Paul E Tilden William D Bedard |
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Affiliation: | (1) U.S. Department of Agriculture, Pacific Southwest Forest and Range Experiment Station Forest Service, 94701 Berkeley, California |
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Abstract: | Racemicezo-brevicomin, racemic frontalin, and myrcene were released at two proportions (5 1 400 and 1 1 1), each at three levels (1 ×, 10 ×, and 100 ×) in a ponderosa pine forest in central California. The 5 1 400 mix was based on an estimate of the relative amounts released from a ponderosa pine under attack by the western pine beetle,Dendroctonus brevicomis. MoreD. brevicomis were trapped at a source of the three compounds released at 5 1 400 than were trapped at a source released at 1 1 1, at all three levels, but this difference was statistically significant only at the 1 × and 10 × levels. Sex ratio of trapped beetles and distribution of catch at the source of attractant and 5 m away apparently did not differ between relative release rates.Coleoptera: Scolytidae.Trade names are mentioned solely for information. No endorsement by the U.S. Department of Agriculture is implied. |
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Keywords: | Dendroctonus brevicomis Coleptera Scolytidae bark beetle western pine beetle attractant rate pheromone exo-brevicomin frontalin myrcene |
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