Journal of Chemical Ecology

, Volume 11, Issue 10, pp 1399–1409 | Cite as

Multichemical defense of plant bugHotea gambiae (Westwood) (Heteroptera: Scutelleridae): (E)-2-hexenol from abdominal gland in adults

  • J. G. C. Hamilton
  • A. J. E. Gough
  • B. W. Staddon
  • D. E. Games
Article
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Abstract

The occurrence inHotea gambia adults of a sexual dimorphism in the divided dorsal abdominal scent gland (dg 1)is reported. Counts made of ducted secretory units indicate that female dg 1 regresses at the end of larval development, unlike male dg 1 which undergoes no regression. Other dorsal abdominal scent glands (dg 2, dg 3) which function in the larvae cease to function during the imaginai moult. From gas chromatographic, mass spectrometric and [1H]NMR data, the identity of the secretion from male adult dg 1 was established as virtually pure (E)-2-hexenol (a 100-mg mature male adult contains 0.5–1 μl of secretion). 2-Hexenol was also found in the reduced female adult dg 1. In the sexually monomorphic metathoracic scent gland, (E)-2-alkenals (C6, C8) and (E)-4-oxohex-2-enal, together with monoterpenes (β-pinene, limonene) but not 2-hexenol, were identified. The vapor of (E)-2-hexenol is repellent to both sexes ofHotea adults and toxic to blowfly (Calliphora) eggs.

Key words

Scent gland defensive secretion Hotea gambiae Heteroptera Scutelleridae (E)-2-hexenol hex-2-enal oct-2-enal 4-oxohex-2-enal β-pinene limonene sex dimorphism feeding repellent pheromone ovicide Calliphora Diptera Calliphoridae 
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Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • J. G. C. Hamilton
    • 1
  • A. J. E. Gough
    • 2
  • B. W. Staddon
    • 1
  • D. E. Games
    • 2
  1. 1.Department of ZoologyUniversity CollegeCardiffWales, UK
  2. 2.Department of ChemistryUniversity CollegeCardiffWales, UK

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