New repellent semiochemicals for three species of Dendroctonus (Coleoptera: Scolytidae)

Abstract

Nine compounds identified from captured volatiles of the Douglas-fir beetle, Dendroctonus pseudotsugae, the mountain pine beetle, D. ponderosae, and the spruce beetle, D. rufipennis, that elicited antennal responses in males and females of one or more of these species were tested in the field to determine behavioural activity. 1-Octen-3-ol, found in the volatiles of females of all three species decreased the response of male and female coastal and male interior D. pseudotsugae and both sexes of D. ponderosae to their aggregation pheromones. Acetophenone, identified in the volatiles of females of all three species, significantly decreased the response of interior female D. pseudotsugae. trans-Verbenol, a potent aggregation pheromone of D. ponderosae, decreased the response of both sexes of D. pseudotsugae, while 3-methyl-2-cyclohexen-1-one (MCH), the antiaggregation pheromone of D. pseudotsugae and D. rufipennis decreased the response of both sexes of D. ponderosae. While it has been demonstrated that semiochemical mediated interspecific communication occurs among bark beetles infesting the same host, this study demonstrates that beetles can perceive signals emitted by heterospecifics attacking nonhosts and can potentially use them to avoid attacking the wrong species of conifer.

Spatial Displacement of Release Point can Enhance Activity of an Attractant Pheromone Synergist of a Bark Beetle

“…If catch in the challenged trap is significantly lower than the control, the test bait is concluded to be inhibitory; if catch is significantly higher than the control, the test bait is concluded to be a synergist or attraction enhancer (Payne et al 1978a;Bedard et al 1980;Bakke 1981;Pureswaran and Borden 2004;Sullivan 2005). Our data demonstrate how such attractant-challenge tests might generate misleading or inconsistent conclusions regarding the activity of a compound.…”

Semiochemicals in the Natural History of Southern Pine Beetle Dendroctonus frontalis Zimmermann and Their Role in Pest Management

“…Both compounds inhibit responses of flying beetles to traps baited with frontalin and α-pinene (Sullivan, 2005;Sullivan et al, 2007a), and 2-phenylethanol reduced responses of beetles to attractant in an ambulatory olfactometer (Brand et al, 1977). These compounds have been detected in other species of Dendroctonus and Ips (Kohnle et al, 1987;Pureswaran and Borden, 2004;Pureswaran et al, 2000;Renwick et al, 1976b;Zhang et al, 2007), and have demonstrated behavioural activity with some (Erbilgin et al, 2007a(Erbilgin et al, , 2008Pureswaran et al, 2000). It was shown in Ips pini that 2-phenylethanol is generated from the amino acid phenylalanine, and both this compound and acetophenone appear to be amino acid derivatives (Gries et al, 1990b;Seybold and Vanderwel, 2003).…”

Réponses électrophysiologiques et comportementales de Dendroctonus valens à des composés volatils non-hôtes

“…Other reports showed similar disruption by alcohols, with the two most effective being (Z)-3-hexen-1-ol and (E)-2-hexen-1-ol [25]. 1-Octen-3-ol was not only identified in the bark volatiles of European birch and aspen [30,31] but also identified in females of D. ponderosae, D. rufipennis, and D. pseudotsugae [14]. Further field tests found that 1-octen-3-ol was repellent to all three Dendroctonus spp.…”

“…Further field tests found that 1-octen-3-ol was repellent to all three Dendroctonus spp. (D. ponderosae, D. rufipennis, and D. pseudotsugae), and 1-octen-3-ol can be potentially be classified as an antiaggregation pheromone, or serve as a kairomone, indicating unacceptable hosts or non-hosts [14]. In development and implementing a semiochemical-based management program for D. valens, NHVs may have considerable potential for disrupting the beetle's ability to locate suitable hosts.…”