Canadian Forest Service Publications

Juvenile hormone and aphid wing dimorphism: Precocene II induces alatization in Macrosiphum euphorbiae. 1982. Delisle, J.; Cloutier, C.; McNeil, J.N. Pages 39-44 in M.W. Stock and A.C. Bartlett, editors. Evolutionary significance of insect polymorphism, Proceedings: National Meeting of the Entomological Society of America. November 29-December 3, 1981, San Diego, California. University of Idaho, Moscow, Idaho.

Year: 1982

Available from: Laurentian Forestry Centre

Catalog ID: 14524

Language: English

CFS Availability: PDF (request by e-mail)

Abstract

Precocene II induced alate production in isolated alatae and apterae of M. euphorbiae. In alatae and apterae conditioned to produce alates in response to crowding, precocene increased alate production. Treatment of both morphs at ages ranging over most of the reproductive period indicated that sensitivity to precocene varied with age and morph. In apterae the age-specific pattern of alatization was similar to that obtained when the reproductive period was scanned with a standardized crowding treatment. JH1 and the JH analogs hydroprene and kinoprene were applied to reduce alate production in aphids pre-conditioned as alata-producers by crowding, or by prior treatment with precocene. Even at doses causing mortality and fecundity reductions, single applications of JH1 and the JH analogs hydroprene and kinoprene were applied to reduce alate production in aphids pre-conditioned as alata-producers by crowding, or by prior treatment with precocene. Even at doses causing mortality and fecundity reductions, single applications of JH1, hydroprene or kinoprene were generally ineffective in inducing apterization, with the exception of a brief 1-day effect obtained with JH1 in apterae pre-treated with precocene. A more persistent apterizing effect was observed when crowded apterae were treated repeatedly with JH1. The results strongly support the hypothesis that juvenile hormone plays an active role in the prenatal determination of the apterous morph in M. euphorbiae.

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