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  • 1
    Electronic Resource
    Electronic Resource
    Effect of juvenile hormone analog, fenoxycarb, on pheromone production byIps paraconfusus (Coleoptera: Scolytidae) (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1087-1098 
    Details
    ISSN: 1573-1561
    Keywords: Juvenile hormone analog ; juvenile hormone ; JH III,Ips paraconfusus ; Coleoptera ; Scolytidae ; bark beetles ; aggregation pheromones ; pheromones ; ipsenol ; ipsdienol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Topical application of the juvenile hormone analog, fenoxycarb, in acetone induced newly emerged male California five-spined ips,Ips paraconfusus Lanier, to become attractive to females, as measured by positive responses to male abdominal extracts in a laboratory bioassay. Two pheromones, ipsdienol and ipsenol, were detected by gas chromatography in the abdominal extracts of fenoxycarb-treated males. Pheromone production was minimal at a dose of 0.1 μg/insect of fenoxycarb, maximal at 10 μg, and was reduced to unmeasurable amounts at a dose of 100 μg. In comparison, peak production of pheromones was induced at a dose of 0.1 μg/insect of natural juvenile hormone (JH III). Treatment with 10 μg of fenoxycarb resulted in the occurrence of pheromones 12 hr after exposure, maximal pheromone content between 16 and 20 hr, and undetectable amounts after 36 hr. The demonstration that fenoxycarb is an active juvenile hormone analog for a bark beetle suggests that it may have practical utility in managing these insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01019337
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  • 2
    Electronic Resource
    Electronic Resource
    Aggregation Pheromone of Pityokteines elegans (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 1333-1347 
    Details
    ISSN: 1573-1561
    Keywords: Semiochemical ; secondary attraction ; pheromone ; Pityokteines elegans ; enantiomer ; ipsenol ; ipsdienol ; ipsenone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In laboratory bioassay experiments, the beetles Pityokteines elegans were attracted to volatiles captured from bolts of grand fir, Abies grandis, colonized by P. elegans males. Male-specific volatiles detected by coupled gas chromatographic–electroantennographic detection (GC-EAD) analysis and by GC–mass spectrometry employing a chiral column were: (S)-(−)-ipsenol, (+)- and (−)-ipsdienol, and ipsenone. Field experiments demonstrated that 1:1 combinations of (−)-ipsenol and (±)-ipsdienol strongly attracted insects of 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. Ipsenol and ipsdienol are now reported as pheromones of five Pityokteines species. Specificity of semiochemical-based communication between sympatric P. elegans and P. minutus appears to be based on host preference and on the composition and chirality of the pheromone blend.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006467.79265.3c
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  • 3
    Electronic Resource
    Electronic Resource
    Pheromone production by axenically rearedDendroctonus ponderosae andIps paraconfusus (Coleoptera: Scolytidae) (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 281-290 
    Details
    ISSN: 1573-1561
    Keywords: Dendroctonus ponderosae ; Ips paraconfusus ; Coleoptera ; Scolytidae ; axenic rearing ; monoterpenes ; aggregation pheromones ; trans-verbenol ; exo-brevicomin ; ipsenol ; ipsdienol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Mountain pine beetles,Dendroctonus ponderosae Hopkins, and California five-spined ips,Ips paraconfusus Lanier, were reared axenically from surface-sterilized eggs on aseptic pine phloem. After 24 hr in host logs, axenip femaleD. ponderosae and maleI. paraconfusus produced the aggregation pheromones,trans-verbenol (D. ponderosae), and ipsenol and ipsdienol (I. paraconfusus). Emergent, axenically reared maleD. ponderosae contained normal amounts of the pheromoneexo-brevicomin. Axenic femaleD. ponderosae treated with juvenile hormone or exposed to vapors of α-pinene, produced the pheromonetrans-verbenol. By 25–35 days after eclosion, axenic females exposed to α-pinene vapors produced over six times as muchtrans-verbenol as wild females, suggesting that while microorganisms in wild females may producetrans-verbenol, they may also inhibit production of the pheromone or use it as a substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987856
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