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  • 1
    Electronic Resource
    Electronic Resource
    Field and electroantennogram responses to sex pheromone optical isomers by monophagous jack pine sawflies (Hymenoptera: Diprionidae) (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 983-995 
    Details
    ISSN: 1573-1561
    Keywords: Pine sawflies ; Neodiprion spp. ; Hymenoptera ; Diprionidae ; electroantennogram ; sex pheromone ; isomers ; jack pine ; Pinus banksiana ; diprionol ; 3,7-dimethylpentadecan-2-ol ; acetate ; propionate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Several species of monophagous jack pine sawflies (Hymenoptera: Diprionidae) were tested in the field and by electroantennograms (EAG) for activity toward the optical isomers of a pine sawfly sex pheromone, the acetate and propionate esters of 3,7-dimethylpentadecan-2-ol.Neodiprion rugifrons andNeodiprion dubiosus were attracted to a mixture of the propionate esters of the 2S,3R,7R and 2S,3R,7S isomers, whereasNeodiprion swainei was attracted to the 2S,3S,7S propionate isomer. Samples containing the 2S,3R,7S propionate isomer elicited the strongest EAG responses in these three species andNeodiprion nigroscutum. The 2S,3S,7S propionate isomer was equally active (EAG) in the case ofN. swainei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987507
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanism of feeding discrimination between matured and juvenile foliage by two species of pine sawflies (1977)
    Springer
    Journal of chemical ecology 3 (1977), S. 677-694 
    Details
    ISSN: 1573-1561
    Keywords: Feeding differentiation ; pine sawflies ; 13-keto-8(14)-podocarpen-18-oic acid ; dehydroabietic acid ; antifeedants ; jack pine ; adaptation of monophagous insects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Two species of pine sawflies,Neodiprion rugifrons Midd. andN. swainei Midd., feed only on matured foliage of jack pine,Pinus banksiana Lamb., and leave juvenile or current-season foliage intact. This unique form of adaptation was studied from the viewpoint of the chemical ecology of this insect-host plant relationship. It was first determined that the differential larval feeding behavior reflects the presence of feeding deterrents. Two major biologically active substances were isolated and identified as 13-keto-8(14)-podocarpen-18-oic acid and dehydroabietic acid. These account for 63.5% and 24.6% of the total deterrency, respectively. The content of the former substance in current-year foliage decreases, as the foliage begins to mature, to the levels that become acceptable toN. swainei by August (60 days old) and to the second generationN. rugifrons by September (90 days old). The timing of their acceptance of juvenile foliage indicates the high levels of adaptation by these insects to allow oviposition for the on-coming adults and acceptable needles for the next generation of larvae. The level of dehydroabietic acid, on the other hand, does not change appreciably during the same time period: this indicates that the component does not play a significant role in the mechanism of differentiating juvenile from matured foliage by the sawfly larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988067
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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