The roles of nicotine and natural enemies in determining larval feeding site distributions of Manduca sexta L. and Manduca quinquemaculata (Haworth) on tobacco

@article{Kester2002TheRO,
  title={The roles of nicotine and natural enemies in determining larval feeding site distributions of Manduca sexta L. and Manduca quinquemaculata (Haworth) on tobacco},
  author={Karen M. Kester and Steven C. Peterson and Frank E. Hanson and D. Michael Jackson and Ray F. Severson},
  journal={CHEMOECOLOGY},
  year={2002},
  volume={12},
  pages={1-10}
}
SummaryField observations indicated that hornworms select feeding sites non-randomly on tobacco. We tested the hypotheses that differences in feeding site locations of larvae of Manducasexta L. and Manducaquinquemaculata (Haworth) (Lepidoptera: Sphingidae) on tobacco could be explained by differential nicotine concentrations within plants and leaves, species-specific responses to nicotine, or pressure exerted by natural enemies. Results showed that third-instar larvae of M. sexta fed more… 
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Strong selective pressure by parasitoids mitigates the costs of consuming chemically defended plants
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The results suggest M. sexta has adopted a novel host plant (devil's claw) outside its typical host range because this host plant provides enemy free space, and oviposition behavior of adult female M. Sexta appears to be well suited to exploiting the enemy-free space on devil's claw.
TER Leaf herbivory and nutrients increase nectar alkaloids
Lynn S. Adler,* Michael Wink, Melanie Distl and Amanda J. Lentz Department of Plant, Soil and Insect Sciences and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts
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It is demonstrated that silencing pmt inhibits nicotine production, while the excess NA dimerizes to form anatabine, providing strong evidence that nicotine functions as an efficient defense in nature and highlights the value of transgenic techniques for ecological research.
The Parasitic Wasp, Cotesia congregata (Say), Consists of Two Incipient Species Isolated by Asymmetric Reproductive Incompatibility and Hybrid Inability to Overcome Host Defenses
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Results indicate that C. congregata is composed of two sympatric incipient species that can utilize multiple host species rather than several host-associated races or cryptic species.
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