Regionally-specific bioactivity of two new pheromones for Dendroctonus rufipennis (Kirby) (Col, Scolytidae)
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| Authors: | Borden, JH; Gries, G; Chong, LJ; Werner, RA; Holsten, EH; Wieser, H; Dixon, EA; Cerezke, HF |
| Year: | 1996 |
| Journal: | Journal of Applied Entomology-Zeitschrift Fur Angewandte Entomologie 120: 321-326 |
| Title: | Regionally-specific bioactivity of two new pheromones for Dendroctonus rufipennis (Kirby) (Col, Scolytidae) |
| Abstract: | 1-Methyl-2-cyclohexen-1-ol (MCOL) was shown for the first time to occur in the frass produced by female spruce beetles, Dendroctonus rufipennis (Kirby). MCOL and 4-methylene-6,6-dimethylbicyclo [3.1.1]hept-2-ene (verbenene) were evaluated in five geographic locations for attractiveness to spruce beetles. In trapping experiments (+/-)- or (+)-MCOL enhanced attraction to a standard blend of alpha-pinene with frontalin in two Alaska locations. (+)-MCOL was attractive and (-)-MCOL inhibitory in south-central British Columbia, and (+)-, (-)- and (+/-)-MCOL were all weakly attractive in one of three experiments in southeastern British Columbia and northern Alberta. Verbenene was attractive only in combination with the standard blend plus MCOL in Alaska. In comparison with the standard bait, tree baits incorporating (+/-)- or (+)-MCOL caused higher numbers of trees to be attacked in the interior Alaska locations and (+)-MCOL had the same effect in south-central British Columbia. Density of attack on attacked trees was unaffected. (+/-)- or (+)-MCOL could improve the operational efficacy of tree baits in Alaska, and (+)-MCOL could be used in southcentral British Columbia. Our results indicate that for wide-ranging scolytid species, operational evaluation of new semiochemicals should be regionally specific. |
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