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- W643674419 abstract "In laboratory bioassays, Porapak Q-captured and steam-distilled volatiles from the bark of host trees, Abies grandis (Dougl.) Lindl., particulally from root-rot infected trees, attracted 5070 % of male and female fir engravers, Scolytus ventralis LeConte. Gas chromatographicelectroantennographic detection (GC-EAD) analyses of Porapak Q-captured bark volatiles revealed 19 EAD-active compounds of which 13 (mostly monoterpenes) were identified by GCmass spectrometry (GC-MS). Multiple-funnel traps baited with Mends of these 13 volatiles released at 280 and 340 mg per 24 h, respectively, attracted 66 and 93 % of the total S. ventralis captured. The clerid predator, Thanasimus undulatus Say, also responded strongly to the kairomonal volatiles. Additional experiments (laboratory bioassays, GC and GC-EAD analyses of volatiles from infested logs and trees undergoing mass attack, female accessory gland extracts, volatiles from emerged, attacking and juvenile hormone-treated beetles, and videotape analysis of the behavior of attacking beetles failed to disclose evidence for aggregation pheromones. I conclude that the attack dynamics of S. ventralis can be explained solely by its primary attraction response to host volatiles. In laboratory bioassays, Pityokteines elegans (Swaine) were attracted to volatiles captured from bolts of grand fir colonized by P. elegans males. Male-specific volatiles detected by GC-EAD analysis and by GC-MS employing a chiral column were: (S)-(-) ipsenol, (+)and (-)-ipsdienol and ipsenone. Combinations of (-)-ipsenol and (*)-ipsdienol (1:l) strongly attracted both sexes to multiple-funnel traps. No beetles were attracted to any of these compounds alone, and both enantiomers of ipsdienol were required with (-)-ipsenol to induce attraction. Specificity of semiochemical-based communication between sympatric species P. elegans and Pityokteines minutus Swaine appears to be based on host preference and on the composition and chirality of the pheromone Mend. Biological observations showed that S. ventralis and P. elegans have different but ovetlapping ecological niches. The possibility of interspecific interference competition was ruled out by evidence that response to attractive semiochemicals and attack on new hosts was not adversely affected by exposure to IV semiochemicals used by the other species. Therefore, exploitation competition must be the sole determinant of the negative interspecific relationships observed in hosts attacked by both species." @default.
- W643674419 created "2016-06-24" @default.
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- W643674419 date "1997-01-01" @default.
- W643674419 modified "2023-09-27" @default.
- W643674419 title "Chemical ecology of Scolytus ventralis Leconte and Pityokteines elegans (Swaine), two bark beetles of Abies grandis (Dougl.) Lindl." @default.
- W643674419 hasPublicationYear "1997" @default.
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