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PHYSICAL DETERRENTS TO INFECTION BY ENTOMOPATHOGENIC NEMATODES IN WIREWORMS (COLEOPTERA: ELATERIDAE) AND OTHER SOIL INSECTS

Published online by Cambridge University Press:  31 May 2012

D.C. Eidt
Affiliation:
Canadian Forest Service - Maritimes Region, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
Graham S. Thurston
Affiliation:
Canadian Forest Service - Maritimes Region, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7

Abstract

Many soil-inhabiting insects are susceptible to entomopathogenic nematodes but the degree of susceptibility ranges widely. Much is understood about the habitat of insect pests in relation to their susceptibility but little attention has been paid to the influence of physical deterrents. "Physical deterrents" is used here to include morphological barriers (passive deterrents) and behavioural responses to attack (active deterrents). The roles of both are reviewed and discussed, in particular with reference to wireworms (Elateridae), a group of insects generally resistant to the nematodes. Knowledge of insect morphology and behaviour as well as habitat is important in predicting susceptibility to entomopathogenic nematodes.

Résumé

Plusieurs insectes du sol sont sensibles aux infections par des nématodes pathogènes, mais cette sensibilité se manifeste à des degrés divers. La relation entre l’habitat des insectes et leur sensibilité aux infections est un phénomène relativement bien connu, mais les mécanismes physiques de défense contre les infections ont été peu étudiés. Le terme "mécanismes physiques de défense" englobe ici les barrières morphologiques (mécanismes passifs) aussi bien que les réactions comportementales aux attaques (mécanismes actifs). Le rôle des deux types de mécanisme est examiné ici, particulièrement chez les vers fils-de-fer (Elateridae), un groupe d’insectes généralement résistants aux nématodes. Une bonne connaissance de la morphologie, du comportement et de l’habitat des insectes est essentielle à l’évaluation de leur sensibilité aux nématodes entomopathogènes.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1995

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