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  • Scolytidae  (36)
  • Springer  (36)
  • 2005-2009
  • 1985-1989  (15)
  • 1980-1984  (16)
  • 1975-1979  (5)
  • 1965-1969
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  • Springer  (36)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Ecdysteroids during pupal development of female Xyleborus ferrugineus (1981)
    Springer
    Entomologia experimentalis et applicata 30 (1981), S. 151-156 
    Details
    ISSN: 1570-7458
    Keywords: Xyleborus ferrugineus ; pupae ; ecdysteroids ; pharate adult ; radioimmunoassay ; Coleoptera ; Scolytidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Der Ecdysteroidtiter weiblicher Puppen von Xyleborus ferrugineus (Fabr.) wurde geschätzt, indem ganze Tiere homogenisiert und radioimmunologisch untersucht wurden. Ein ausgeprägtes Maximum an Ecdysteroiden wurde bei 36 Stunden Puppenent-wicklung beobachtet (743 pg/mg Körpergewicht). Der Titer nahm ab auf 299 pg/mg im Pharatstadium und auf 193 pg/mg unmittelbar vor Schlüpfen der Adulten. Qualitative Studien mit HPLC ergaben in frischen Puppen ein Verhältnis von 3:1 Ecdyson zu 20-Hydrooxyecdyson. Pharatstadien enthielten vor allem 20-Hydrooxyecdyson. Das beobachtete einzige Maximum im Titer stimmt überein mit den Resultaten bei andern untersuchten Coleopteren.
    Notes: Abstract Ecdysteroid titers were estimated on the whole body homogenates of Xyleborus ferrugineus (Fabr.) female pupae during development by radioimmunoassay. A distinct peak of ecdysteroids was observed at 36-hr pupal development (743 pg/mg body wt). Titer declined to 299 pg/mg by the pharate adult stage and to 193 pg/mg body wt just before adult emergence. Qualitative studies by HPLC revealed a ratio of 3:1 ecdysone to 20-hydroxyecdysone in the initial pupal stage. Pharate adults had mainly 20-hydroxyecdysone. The observed single peak in ecdysteroid titer agrees with findings in other studied coleopteran species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300880
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  • 2
    Electronic Resource
    Electronic Resource
    Trapping the western pine beetle at and near a source of synthetic attractive pheromone Effects of trap size and position (1979)
    Springer
    Journal of chemical ecology 5 (1979), S. 519-531 
    Details
    ISSN: 1573-1561
    Keywords: Pinus ponderosa ; Dendroctonus brevicomis ; western pine beetle ; attractant ; pheromone ; behavior ; traps ; Coleoptera ; Scolytidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Western pine beetles were caught on unbaited sticky traps placed near a source ofexo-brevicomin, frontalin, and myrcene. Size of trap, distance and direction from the source of attractant, and height from the ground were varied. Significant differences in trap catch were observed in relation to each of the variables. Traps close to the source of attractant caught more beetles than traps farther from the source. Traps downwind of the source of attractant caught more beetles than did upwind traps. More males than females were trapped close to the source of attractant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987837
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  • 3
    Electronic Resource
    Electronic Resource
    Pheromonal attraction and allomonal interruption ofIps pini in California by the two enantiomers of ipsdienol (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 703-717 
    Details
    ISSN: 1573-1561
    Keywords: Scolytidae ; bark beetle ; Ips pini ; pheromone ; ipsdienol ; enantiomer ; interruption ; allomone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Air containing volatile compounds from around maleIps pini boring in ponderosa pine logs from California was condensed, fractionated by GC, and assayed in the laboratory and field. The only fraction that showed consistent activity in laboratory assays contained a single compound identified as ipsdienol (2-methyl-6-methylene-2,7-octadien-4-ol). Synthetic racemic ipsdienol showed no activity in either the laboratory or field. However, (−)-ipsdienol, the naturally occurring enantiomer, was attractive toI. pini in the laboratory and field, whereas (+)-ipsdienol interrupted the response ofI. pini to a natural source of attraction in field tests. (−)-Ipsdienol is a major component of the attractant pheromone of this species, since its level of activity in laboratory assays was quantitatively comparable to that of the condensed volatiles, and it was as attractive as maleI. pini boring in ponderosa pine in the field. (+)-Ipsdienol is a component of the pheromone of the competing species,I. paraconfusus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987680
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  • 4
    Electronic Resource
    Electronic Resource
    Sex-specific production of ipsdienol and myrcenol byDendroctonus ponderosae (Coleoptera: Scolytidae) exposed to myrcene vapors (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 1579-1586 
    Details
    ISSN: 1573-1561
    Keywords: Dendroctonus ponderosae ; bark beetle ; Coleoptera ; Scolytidae ; myrcene ; aggregation pheromones ; ipsdienol ; myrcenol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Male mountain pine beetles,Dendroctonus ponderosae Hopkins, produced ipsdienol [97.0% ± 0.3S-(+)] and myrcenol (90.3% ± 4.0E) when exposed to myrcene vapors. Females which were exposed to myrcene vapors did not produce any ipsdienol, but did produce low levels of myrcenol (98.0% ± 0.7E). Neither sex produced detectable levels of ipsdienol or myrcenol when fed for 24 hr on lodgepole pine,Pinus contorta var.latifolia Engelmann. The sex-specific conversion of myrcene to ipsdienol and myrcenol suggests that these compounds may have behavioral significance within the species. In addition, the S-(+)-ipsdienol produced by maleD. ponderosae probably functions as a repellent allomone againstIps pini (Say).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020265
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and field testing of 4,6,6-lineatin, the aggregation pheromone ofTrypodendron lineatum (Coleoptera: Scolytidae) (1979)
    Springer
    Journal of chemical ecology 5 (1979), S. 681-689 
    Details
    ISSN: 1573-1561
    Keywords: Trypodendron lineatum ; 4,6,6-lineatin ; 3,3,7-trimethyl-2,9-dioxatricyclo[3.3.1.04,7]nonane ; pheromone ; attractant ; tricyclic acetal ; Scolytidae ; aggregation pheromone ; ambrosia beetle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Authentic 4,6,6-lineatin (3,3,7-trimethyl-2,9-dioxatricyclo-[3.3.1.04,7]nonane) (I) was produced in low yield via three synthetic pathways. In field tests, microgram amounts of the product from all three syntheses attracted large numbers ofTrypodendron lineatum of both sexes. These results confirm that 4,6,6-lineatin (I) is a population aggregation pheromone forT. lineatum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00986553
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Chiral escape of bark beetles from predators responding to a bark beetle pheromone (1989)
    Springer
    Oecologia 80 (1989), S. 566-569 
    Details
    ISSN: 1432-1939
    Keywords: Kairomones ; Predation ; Coevolution ; Scolytidae ; Pheromones ; Chirality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two species of predatory beetles that locate their prey, Ips pini, by responding to its aggregation pheromone have different chiral preferences to ispdienol than does the herbivore. This suggests that chiral disparity may provide some escape for bark beetles from predation, and that geographic variation in herbivore communication systems may be partially due to predator — imposed selection pressures. These results also suggest ways in which the semiochemical and biological control of North America's most damaging group of forest insects can be improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380083
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  • 8
    Electronic Resource
    Electronic Resource
    Mutual inhibition of the attractant pheromone response by two species ofIps(Coleoptera: Scolytidae) (1975)
    Springer
    Journal of chemical ecology 1 (1975), S. 101-113 
    Details
    ISSN: 1573-1561
    Keywords: pheromone ; inhibition ; Scolytidae ; Ips ; pini ; paraconfusus ; ipsenol ; linalool
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The bark beetles,Ips pini andI. paraconfusus, are not cross-attractive in the field although they attack the same host material at the same time. Logs containing the pheromone-producing sex (males) of both species side by side attract significantly fewer beetles of each species than do males of either species alone. Ipsenol, a component of the maleI. paraconfusus pheromone, duplicates the activity of maleI. paraconfusus in inhibiting the response ofI. pini to maleI. pini. Linalool from maleI. pini also reduces the catch ofI. paraconfusus in response to maleI. paraconfusus. Simultaneous production of a specific attractant pheromone and an interspecific chemical inhibitor favors exclusive use of the host substrate by the first arriving species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987723
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  • 9
    Electronic Resource
    Electronic Resource
    Specificity of response to pheromones in the genusIps (Coleoptera: Scolytidae) (1975)
    Springer
    Journal of chemical ecology 1 (1975), S. 9-23 
    Details
    ISSN: 1573-1561
    Keywords: Ips ; Scolytidae ; aggregating pheromone ; reproductive isolation ; specificity ; cross-attraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Seventeen species ofIps were laboratory or field tested for the specificity of their response to male-produced aggregating pheromones. In the laboratory, some species appeared not to differentiate among their own pheromones and those of closely related species, whether the pheromones were bioassayed individually or in direct competition. Other species showed strong preference for their own pheromones in competition with those of closely related species, even though they had demonstrated strong attraction to pheromones of the related species. Cross-responsiveness amongI. confusus, I. montanus, andI. paraconfusus, and betweenI. mexicanus andI. concinnus, was confirmed in field tests. Moreover, wildI. paraconfusus females entered the nuptial chambers of males ofI. montanus andI. confusus but not those of the more distantly relatedI. mexicanus. It is hypothesized that specificity of response to aggregating pheromone is important in the maintenance of reproductive isolation among sympatricIps and that the lack of specificity among closely related species enforces the parapatric distributions characteristic of these species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987717
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of chirality of alcohol or latent alcohol semiochemicals in individual insects (1985)
    Springer
    Journal of chemical ecology 11 (1985), S. 1659-1667 
    Details
    ISSN: 1573-1561
    Keywords: Chiral semiochemicals ; pheromones ; enantiomeric composition ; Ips pini ; Coleoptera ; Scolytidae ; Apis mellifera ; Hymenoptera ; apidae ; Cryptolestes Ferrugineus ; Cucujidae ; acetyl lactate diastereoisomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A method is described for determining the enantiomeric composition of chiral alcohols, lactones, and hydroxy acids in quantities ranging from 25 ng to 10 μg. Derivatization of the substance with chirally pure acetyl lactate, followed by splitless capillary gas chromatography, enables enantiomeric determinations to be made within 1–3% of the actual value. This technique was applied in the determination of semiochemical inIps pini (Say),Apis mellifera (L.), andCryptolestes ferrugineus (Stephens). The results indicate that considerable variability exists within populations of some insects in the composition of their chiral semiochemicals, whereas others produce substances of constant composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012119
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