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EMODIN IN BUCKTHORN: A FEEDING DETERRENT TO PHYTOPHAGOUS INSECTS1

Published online by Cambridge University Press:  31 May 2012

Henry Trial Jr.  and
J. B. Dimond
Henry Trial Jr.
Affiliation:
Department of Entomology, University of Maine, Orono 04469
J. B. Dimond
Affiliation:
Department of Entomology, University of Maine, Orono 04469
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Abstract

Emodin, a mixture of anthraquinones, occurs in the Rhamnaceae and functions as a deterrent to foliage-feeding insects. There was little attack on foliage of Rhamnus alnifolia in wild stands compared with associated species of woody plants. Anthraquinones extracted from foliage of R. alnifolia were similar to purchased emodin in thin-layer chromatographic and infra-red spectroscopic analyses. Quantities of emodin in foliage samples were high in May, declining to low levels in August. Leaf powders, leaf extracts, and purchased emodin all showed feeding deterrent activity when mixed with artificial diets and assayed with gypsy moth larvae. Purchased emodin showed similar activity when sprayed on foliage of small cherry trees and assayed with eastern tent caterpillar larvae.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 2 , February 1979 , pp. 207 - 212
Copyright
Copyright © Entomological Society of Canada 1979

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