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EFFECT OF A PHENYL-BENZOYL UREA [l-(4-CHLOROPHENYL)-3-(2,6-DIFLUOROBENZOYL)-UREA] ON DIPRION SIMILIS (HYMENOPTERA: DIPRIONIDAE)

Published online by Cambridge University Press:  31 May 2012

W. H. Fogal
W. H. Fogal
Affiliation:
Great Lakes Forest Research Centre, Canadian Forestry Service, Sault Ste. Marie, Ontario
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Abstract

Ingestion of a phenyl-benzoyl urea [1-(4-chlorophenyl)-3-(2,6-difluorobenzoyl)-urea] by Diprion similis (Hartig) interferes with molting. At the highest concentration (1% solution) tested, it prevents ecdysis but does not prevent apolysis. The Cuticle of pharate larvae is thinner than normal but the formation of melanin in the cuticle is not inhibited. At a concentration of.01%, ecdysis is usually completed but many survivors fail to feed following the molt. This failure is associated with the accumulation of a fibrous material in the midgut. Prior to the molt, food consumption as measured by faecal output is not impaired.

Résumé

L’ingestion d’un composé d’urée au phényl-benzoyl [1-(4-chlorophényl)-3-(2,6-difluorobenzoyl)-urée] par Diprion similis entrave la mue de l’insecte. Au point de concentration le plus élevé, (solution à 1%) mis à l’essai, elle empêche l’ecdysis mais n’empêche pas l’apolysis. La cuticule des larves "pharates" est plus mince que la normale mais la formation de mélanine dans la cuticule n’est pas entravée. Avec un point de concentration de 0.1%, l’ecdysis est habituellement totale mais de nombreux survivants cessent de se nourrir après la mue. Ce phénomène est relié à l’accumulation de matériel fibreux dans l’intestin moyen. Avant la mue, la consommation de nourriture telle que mesurée d’après les excrétions, n’est pas altérée.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 7 , July 1977 , pp. 981 - 986
Copyright
Copyright © Entomological Society of Canada 1977

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