Canadian Forest Service Publications

Effect of a phenyl-benzoyl urea [1-(chloropnenyl)-3-(2,6-difluorobenzoyl)-Urea] on Diprion similis (Hymenoptera: Diprionae). 1977. Fogal, W.H. Canadian Entomologist 109:981-986.

Year: 1977

Available from: Great Lakes Forestry Centre

Catalog ID: 36747

Language: English

CFS Availability: PDF (request by e-mail)

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 (I% solution) tested, it prevents ecdysis but does not prevent apolysis. The cuticle of pharate larvae is thinner than nonnal but the fonnation 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.

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