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INFLUENCE OF NATURAL DIETS AND LARVAL DENSITY ON GYPSY MOTH, LYMANTRIA DISPAR (LEPIDOPTERA: ORGYIIDAE), EGG MASS CHARACTERISTICS1

Published online by Cambridge University Press:  31 May 2012

John L. Capinera  and
Pedro Barbosa
John L. Capinera
Affiliation:
Department of Entomology, University of Massachusetts, Amherst
Pedro Barbosa
Affiliation:
Department of Entomology, University of Massachusetts, Amherst
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Abstract

Laboratory and field studies indicate that differences in gypsy moth egg mass characteristics can be related to larval density and natural diet. Egg mass characteristics are valuable indices of population quality as well as future population levels. Laboratory crowding reduced number of eggs/mass but did not affect egg size. Field collected egg masses from various population levels in Massachusetts also varied in egg number/mass, but egg size could not be directly correlated to density. Laboratory rearing of larvae on several natural diets produced differences in both egg number and size. Maple diets produced egg masses with fewer, smaller eggs, as compared with oak diets. Field collected egg masses also varied in mean egg size, according to host tree species. Thus, forest composition may directly affect the quality of gypsy moth populations, as well as numerical levels. Increasing density could affect egg size indirectly, by forcing gypsy moth larvae to feed on unfavorable host foliage.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 10 , October 1977 , pp. 1313 - 1318
Copyright
Copyright © Entomological Society of Canada 1977

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