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LABORATORY STUDIES ON DEVELOPMENT OF GYPSY MOTH, LYMANTRIA DISPAR (L.) (LEPIDOPTERA: LYMANTRIIDAE), LARVAE ON FOLIAGE OF GYMNOSPERMS

Published online by Cambridge University Press:  31 May 2012

Jeffrey C. Miller  and
Paul E. Hanson
Jeffrey C. Miller
Affiliation:
Department of Entomology, Oregon State University, Conallis, Oregon, USA97331
Paul E. Hanson
Affiliation:
Department of Entomology, Oregon State University, Conallis, Oregon, USA97331
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Abstract

The development of gypsy moth larvae was monitored in the laboratory on the foliage of 39 species belonging to 18 genera in the Araucaraceae, Cupressaceae, Ginkgoaceae, Pinaceae, Taxaceae, and Taxodiaceae. Larval survival through successive molts, time of larval development, live female pupal weights, and adult female production of ova were measured as indicators of host plant suitability for the gypsy moth. The criteria for distinguishing the most suitable hosts were as follows: (1) greater than 80% survival of first-instar larvae, (2) development to pupation in less than 41 days, (3) female pupal weights over 1099 mg, and (4) the production of more than 350 ova. The most suitable species were in the Pinaceae, in particular, Cedrus deodara (Roxb. ex Lamb.) G. Don, Larix decidua Mill., and Picea pungens Engelm. The least suitable species were in the Cupressaceae, Ginkgoaceae, and Taxaceae. First-, second-, and third-instar larvae often differed in their ability to survive on new foliage compared with foliage from the previous year. Overall, first-instar larvae successfully developed into adults on 20 of the species tested but second-instar larvae developed into adults on 29 of the species tested. First- through fourth- or fifth-instar larvae failed to develop into adults on eight of the species tested.

Résumé

On a étudié le développement des larves de la spongieuse au laboratoire sur du feuillage de 39 espèces appartenant à 18 genres des Araucaraceae, Cupressaceae, Ginkgoaceae, Pinaceae, Taxaceae et Taxodiaceae. La survie larvaire aux différentes mues, la durée du développement larvaire, le poids frais des pupes femelles et la production des oeufs, ont été mesurés comme indicateurs de la convenance de la plante pour la spongieuse. Les critères qui distinguent les hôtes les plus convenables étaient (1) une survie de 80% du premier stade larvaire, (2) moins de 41 jours de développement jusqu’à la pupaison, (3) le poids des pupes femelles excédant 1099 mg, et (4) la production de plus de 350 oeufs. Les espèces les plus convenables étaient des Pinaceae, en particulier Cedrus deodara (Roxb. ex Lamb.) G. Don, Larix decidua Mill., et Picea pungens Engelm. Les espèces les moins convenables étaient des Cupressaceae, Ginkgoaceae, et Taxaceae. Les larves des premier, deuxième et troisième stades ont souvent montré différents niveaux de survie sur le feuillage nouveau, comparé au feuillage de l’année précédente. Globalement, les larves de premier stade se sont développées avec succès en adultes sur 20 des espèces testées, mais celles de deuxième stade ont produit des adultes sur 29 des espèces testées. Les larves des premier au quatrième ou au cinquième stade n’ont pas atteint le stade adulte sur huit des espèces testées.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 6 , June 1989 , pp. 425 - 429
Copyright
Copyright © Entomological Society of Canada 1989

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