The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform

J H Borden - One of the best experts on this subject based on the ideXlab platform.

  • semiochemical interactions between Scolytus ventralis leconte and pityokteines elegans swaine coleoptera scolytidae
    Journal of Entomological Science, 2001
    Co-Authors: Jorge E Maciassamano, J H Borden
    Abstract:

    Two experiments evaluated the effect of baiting uninfested grand fir logs and trees undergoing initial attack by Scolytus ventralis LeConte with Pityokteines elegans (Swaine) pheromone, on the subsequent attack by both species. Two more experiments assessed the effect of synthetic bark oil, exo-brevicomin, and P. elegans pheromone on the response by each species to multiple-funnel traps baited with attractants for the other species. The pheromone of P. elegans on unattacked logs did not have an inhibitory effect on the attack by S. ventralis. However, trees attacked by S. ventralis that were baited with P. elegans pheromone just after attack, yielded significantly fewer S. ventralis progeny than the unbaited controls. Neither synthetic bark oil nor exo-brevicomin caused a significant change in the catch of P. elegans in traps baited with its pheromone, but the predator Thanasimus undatulus Say was caught in traps baited with (±)-ipsenol, (±)-ipsdienol and synthetic bark oil, and another predator, Enocleru...

  • interactions between Scolytus ventralis and pityokteines elegans coleoptera scolytidae in abies grandis
    Environmental Entomology, 2000
    Co-Authors: Jorge E Maciassamano, J H Borden
    Abstract:

    When standing and fallen grand firs, Abies grandis (Douglas ex D. Don) Lindley, were co-attacked by fir engravers, Scolytus ventralis LeConte, and Pityokteines elegans (Swaine), 5.8% of galleries of the latter species were initiated from galleries of the former. Larval S. ventralis avoided contact with both con- and heterospecific galleries, whereas P. elegans adult and larval galleries freely crossed those of S. ventralis. There were strong and weak negative relationships for gallery establishment and emergence, respectively, between the 2 species, but numerous instances in which both species co-inhabited the same resource. Unlike many scolytids, the 2 species did not partition the host according to the diameter of the bole. The results indicate a moderate level of competitive interaction between the 2 species in which P. elegans would either colonize an area of bark before S. ventralis, which would then not initiate attack, or in which both species would co-attack a host, but S. ventralis would avoid phloem colonized by P. elegans.

  • Primary Attraction of the Fir Engraver, Scolytus ventralis
    Journal of Chemical Ecology, 1998
    Co-Authors: J. E. Macías-sámano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries, G. G. S. King
    Abstract:

    In laboratory bioassays, Porapak Q-captured and steam-distilled volatiles from the bark of host trees, Abies grandis , particularly from root-rot-infected trees, attracted 50–70% of male and female fir engravers, Scolytus ventralis . Gas chromatographic–electroantennographic detection (GC-EAD) analyses of Porapak Q-captured bark volatiles revealed 19 EAD-active compounds of which 13 (mostly monoterpenes) were identified by GC–mass spectrometry (GC-MS). In separate field experiments, multiple-funnel traps baited with two blends of these 13 synthetic volatiles released at 280 and 340 mg/ 24 hr attracted 66 and 93% of the total S. ventralis captured, respectively. The clerid predator, Thanasimus undulatus , also responded strongly to the kairomonal volatiles. Additional experiments produced no evidence for aggregation pheromones in S. ventralis. These included laboratory bioassays and GC and GC-EAD analyses of Porapak Q-captured volatiles from male- and female-infested logs or trees undergoing mass attack in the field, GC analyses and/or bioassays of extracts from female accessory glands, extracted volatiles from emerged, attacking and juvenile hormone-treated beetles of both sexes, and videotape analysis of the behavior of attacking beetles on the bark surface. We argue against the hypothesis of pheromone-mediated secondary attraction in S. ventralis and conclude that the attack dynamics of this species can be explained solely by its sensitive primary attraction response to host volatiles.

  • lack of evidence for pheromone mediated secondary attraction in the fir engraver Scolytus ventralis coleoptera scolytidae
    Journal of the Entomological Society of British Columbia, 1998
    Co-Authors: Jorge E Maciassamano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries
    Abstract:

    To test the hypothesis that host selection and mass attack by the fir engraver, Scolytus ventralis LeConte, is mediated in part by pheromones, an exhaustive series of experiments was conducted. Gas chromatographic (GC) analysis and GC-electroantennographic detection analysis was performed on Porapak Q-captured volatiles from virgin and mated beetles of both sexes, logs of grand fir, Abies grandis (Dougl.) Lindl., with males, females or both sexes boring in the bark, and trees undergoing attack in the field, and on extracts of abdominal tips from beetles topically-treated with methoprene, a juvenile hormone analogue, or beetles boring in methoprene-treated bark of grand fir. None of these analyses disclosed any sex-specific compounds or compounds that changed markedly in concentration following treatment. Extracts of the females' terminal abdominal glands with associated vaginal palpi contained exo-brevicomin, a common aggregation pheromone in the genera Dendroctonus and Dryocoetes, but laboratory and field experiments showed it to have no apparent role in long-range orientation. Extensive visual and videotaped observations revealed that females walking on grand fir bark displayed apparent "calling" and "marking" behavior. and during courtship males rubbed the females' abdominal declivity with their frons, placing their antennae in juxtaposition to the females' vaginal palpi. These results arc consistent with the alternative hypothesis that host selection and mass attack by S. ventralis are mediated solely by primary attractants to the host tree, but they do not rule out the possibility of short-range pheromone-mediated behavior. Key words: Scolytus ventralis; Coleoptera; Scolytidae; chemical ecology; pheromones; host selection

G. G. S. King - One of the best experts on this subject based on the ideXlab platform.

  • Primary Attraction of the Fir Engraver, Scolytus ventralis
    Journal of Chemical Ecology, 1998
    Co-Authors: J. E. Macías-sámano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries, G. G. S. King
    Abstract:

    In laboratory bioassays, Porapak Q-captured and steam-distilled volatiles from the bark of host trees, Abies grandis , particularly from root-rot-infected trees, attracted 50–70% of male and female fir engravers, Scolytus ventralis . Gas chromatographic–electroantennographic detection (GC-EAD) analyses of Porapak Q-captured bark volatiles revealed 19 EAD-active compounds of which 13 (mostly monoterpenes) were identified by GC–mass spectrometry (GC-MS). In separate field experiments, multiple-funnel traps baited with two blends of these 13 synthetic volatiles released at 280 and 340 mg/ 24 hr attracted 66 and 93% of the total S. ventralis captured, respectively. The clerid predator, Thanasimus undulatus , also responded strongly to the kairomonal volatiles. Additional experiments produced no evidence for aggregation pheromones in S. ventralis. These included laboratory bioassays and GC and GC-EAD analyses of Porapak Q-captured volatiles from male- and female-infested logs or trees undergoing mass attack in the field, GC analyses and/or bioassays of extracts from female accessory glands, extracted volatiles from emerged, attacking and juvenile hormone-treated beetles of both sexes, and videotape analysis of the behavior of attacking beetles on the bark surface. We argue against the hypothesis of pheromone-mediated secondary attraction in S. ventralis and conclude that the attack dynamics of this species can be explained solely by its sensitive primary attraction response to host volatiles.

Gerhard Gries - One of the best experts on this subject based on the ideXlab platform.

  • Primary Attraction of the Fir Engraver, Scolytus ventralis
    Journal of Chemical Ecology, 1998
    Co-Authors: J. E. Macías-sámano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries, G. G. S. King
    Abstract:

    In laboratory bioassays, Porapak Q-captured and steam-distilled volatiles from the bark of host trees, Abies grandis , particularly from root-rot-infected trees, attracted 50–70% of male and female fir engravers, Scolytus ventralis . Gas chromatographic–electroantennographic detection (GC-EAD) analyses of Porapak Q-captured bark volatiles revealed 19 EAD-active compounds of which 13 (mostly monoterpenes) were identified by GC–mass spectrometry (GC-MS). In separate field experiments, multiple-funnel traps baited with two blends of these 13 synthetic volatiles released at 280 and 340 mg/ 24 hr attracted 66 and 93% of the total S. ventralis captured, respectively. The clerid predator, Thanasimus undulatus , also responded strongly to the kairomonal volatiles. Additional experiments produced no evidence for aggregation pheromones in S. ventralis. These included laboratory bioassays and GC and GC-EAD analyses of Porapak Q-captured volatiles from male- and female-infested logs or trees undergoing mass attack in the field, GC analyses and/or bioassays of extracts from female accessory glands, extracted volatiles from emerged, attacking and juvenile hormone-treated beetles of both sexes, and videotape analysis of the behavior of attacking beetles on the bark surface. We argue against the hypothesis of pheromone-mediated secondary attraction in S. ventralis and conclude that the attack dynamics of this species can be explained solely by its sensitive primary attraction response to host volatiles.

  • lack of evidence for pheromone mediated secondary attraction in the fir engraver Scolytus ventralis coleoptera scolytidae
    Journal of the Entomological Society of British Columbia, 1998
    Co-Authors: Jorge E Maciassamano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries
    Abstract:

    To test the hypothesis that host selection and mass attack by the fir engraver, Scolytus ventralis LeConte, is mediated in part by pheromones, an exhaustive series of experiments was conducted. Gas chromatographic (GC) analysis and GC-electroantennographic detection analysis was performed on Porapak Q-captured volatiles from virgin and mated beetles of both sexes, logs of grand fir, Abies grandis (Dougl.) Lindl., with males, females or both sexes boring in the bark, and trees undergoing attack in the field, and on extracts of abdominal tips from beetles topically-treated with methoprene, a juvenile hormone analogue, or beetles boring in methoprene-treated bark of grand fir. None of these analyses disclosed any sex-specific compounds or compounds that changed markedly in concentration following treatment. Extracts of the females' terminal abdominal glands with associated vaginal palpi contained exo-brevicomin, a common aggregation pheromone in the genera Dendroctonus and Dryocoetes, but laboratory and field experiments showed it to have no apparent role in long-range orientation. Extensive visual and videotaped observations revealed that females walking on grand fir bark displayed apparent "calling" and "marking" behavior. and during courtship males rubbed the females' abdominal declivity with their frons, placing their antennae in juxtaposition to the females' vaginal palpi. These results arc consistent with the alternative hypothesis that host selection and mass attack by S. ventralis are mediated solely by primary attractants to the host tree, but they do not rule out the possibility of short-range pheromone-mediated behavior. Key words: Scolytus ventralis; Coleoptera; Scolytidae; chemical ecology; pheromones; host selection

J. E. Macías-sámano - One of the best experts on this subject based on the ideXlab platform.

  • Primary Attraction of the Fir Engraver, Scolytus ventralis
    Journal of Chemical Ecology, 1998
    Co-Authors: J. E. Macías-sámano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries, G. G. S. King
    Abstract:

    In laboratory bioassays, Porapak Q-captured and steam-distilled volatiles from the bark of host trees, Abies grandis , particularly from root-rot-infected trees, attracted 50–70% of male and female fir engravers, Scolytus ventralis . Gas chromatographic–electroantennographic detection (GC-EAD) analyses of Porapak Q-captured bark volatiles revealed 19 EAD-active compounds of which 13 (mostly monoterpenes) were identified by GC–mass spectrometry (GC-MS). In separate field experiments, multiple-funnel traps baited with two blends of these 13 synthetic volatiles released at 280 and 340 mg/ 24 hr attracted 66 and 93% of the total S. ventralis captured, respectively. The clerid predator, Thanasimus undulatus , also responded strongly to the kairomonal volatiles. Additional experiments produced no evidence for aggregation pheromones in S. ventralis. These included laboratory bioassays and GC and GC-EAD analyses of Porapak Q-captured volatiles from male- and female-infested logs or trees undergoing mass attack in the field, GC analyses and/or bioassays of extracts from female accessory glands, extracted volatiles from emerged, attacking and juvenile hormone-treated beetles of both sexes, and videotape analysis of the behavior of attacking beetles on the bark surface. We argue against the hypothesis of pheromone-mediated secondary attraction in S. ventralis and conclude that the attack dynamics of this species can be explained solely by its sensitive primary attraction response to host volatiles.

Regine Gries - One of the best experts on this subject based on the ideXlab platform.

  • Primary Attraction of the Fir Engraver, Scolytus ventralis
    Journal of Chemical Ecology, 1998
    Co-Authors: J. E. Macías-sámano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries, G. G. S. King
    Abstract:

    In laboratory bioassays, Porapak Q-captured and steam-distilled volatiles from the bark of host trees, Abies grandis , particularly from root-rot-infected trees, attracted 50–70% of male and female fir engravers, Scolytus ventralis . Gas chromatographic–electroantennographic detection (GC-EAD) analyses of Porapak Q-captured bark volatiles revealed 19 EAD-active compounds of which 13 (mostly monoterpenes) were identified by GC–mass spectrometry (GC-MS). In separate field experiments, multiple-funnel traps baited with two blends of these 13 synthetic volatiles released at 280 and 340 mg/ 24 hr attracted 66 and 93% of the total S. ventralis captured, respectively. The clerid predator, Thanasimus undulatus , also responded strongly to the kairomonal volatiles. Additional experiments produced no evidence for aggregation pheromones in S. ventralis. These included laboratory bioassays and GC and GC-EAD analyses of Porapak Q-captured volatiles from male- and female-infested logs or trees undergoing mass attack in the field, GC analyses and/or bioassays of extracts from female accessory glands, extracted volatiles from emerged, attacking and juvenile hormone-treated beetles of both sexes, and videotape analysis of the behavior of attacking beetles on the bark surface. We argue against the hypothesis of pheromone-mediated secondary attraction in S. ventralis and conclude that the attack dynamics of this species can be explained solely by its sensitive primary attraction response to host volatiles.

  • lack of evidence for pheromone mediated secondary attraction in the fir engraver Scolytus ventralis coleoptera scolytidae
    Journal of the Entomological Society of British Columbia, 1998
    Co-Authors: Jorge E Maciassamano, J H Borden, Regine Gries, H D Pierce, Gerhard Gries
    Abstract:

    To test the hypothesis that host selection and mass attack by the fir engraver, Scolytus ventralis LeConte, is mediated in part by pheromones, an exhaustive series of experiments was conducted. Gas chromatographic (GC) analysis and GC-electroantennographic detection analysis was performed on Porapak Q-captured volatiles from virgin and mated beetles of both sexes, logs of grand fir, Abies grandis (Dougl.) Lindl., with males, females or both sexes boring in the bark, and trees undergoing attack in the field, and on extracts of abdominal tips from beetles topically-treated with methoprene, a juvenile hormone analogue, or beetles boring in methoprene-treated bark of grand fir. None of these analyses disclosed any sex-specific compounds or compounds that changed markedly in concentration following treatment. Extracts of the females' terminal abdominal glands with associated vaginal palpi contained exo-brevicomin, a common aggregation pheromone in the genera Dendroctonus and Dryocoetes, but laboratory and field experiments showed it to have no apparent role in long-range orientation. Extensive visual and videotaped observations revealed that females walking on grand fir bark displayed apparent "calling" and "marking" behavior. and during courtship males rubbed the females' abdominal declivity with their frons, placing their antennae in juxtaposition to the females' vaginal palpi. These results arc consistent with the alternative hypothesis that host selection and mass attack by S. ventralis are mediated solely by primary attractants to the host tree, but they do not rule out the possibility of short-range pheromone-mediated behavior. Key words: Scolytus ventralis; Coleoptera; Scolytidae; chemical ecology; pheromones; host selection