Mechanism of feeding discrimination between matured and juvenile foliage by two species of pine sawflies
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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.
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- Mechanism of feeding discrimination between matured and juvenile foliage by two species of pine sawflies
Journal of Chemical Ecology
Volume 3, Issue 6 , pp 677-694
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- Online ISSN
- Kluwer Academic Publishers-Plenum Publishers
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- Feeding differentiation
- pine sawflies
- 13-keto-8(14)-podocarpen-18-oic acid
- dehydroabietic acid
- jack pine
- adaptation of monophagous insects
- Industry Sectors