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BIOLOGY OF PINE FALSE WEBWORM (HYMENOPTERA: PAMPHILIIDAE) DURING AN OUTBREAK

Published online by Cambridge University Press:  31 May 2012

Christopher Asaro  and
Douglas C. Allen
Christopher Asaro
Affiliation:
State University of New York College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, New York, USA 13210
Douglas C. Allen*
Affiliation:
State University of New York College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, New York, USA 13210
*
2Author to whom all correspondence should be addressed (E-mail: [email protected]).
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Abstract

The life history of pine false webworm, Acantholyda erythrocephala (L.), in three pine (Pinaceae) plantations in northern New York is similar to that reported for this species on red pine, Pinus resinosa Aiton, in Ontario. Adult emergence extended from early May to early June. The sex ratio of emerging adults favored males by as much as 2.7:1. Oviposition occurred from mid-May to early June. Significantly more eggs per fascicle were deposited on the distal third of branches and in the lower third of the crown. Larval feeding took place throughout June. The proportion of prepupae remaining in the soil for more than 1 year varied from 9% to 66% between two sites. There was no evidence of egg parasitism, and egg survival exceeded 95% in each of 2 years. A new species of nematode (Steinernema sp.) (Nematoda: Steinernematidae) was recovered from pronymphs. Homaspis interruptus (Provancher) (Hymenoptera: Ichneumonidae) parasitized larvae and emerged from 8.5% and 2.8% of the pronymphs in two populations.

Résumé

La démographie du Pamphile introduit du pin, Acantholyda erythrocephala (L.) dans trois plantations de pins (Pinaceae) du nord du New York est semblable à celle décrite pour cette espèce sur le pin rouge, Pinus resinosa Aiton, en Ontario. L’émergence des adultes s’est produite du début de mai au début de juin. Les mâles étaient plus nombreux que les femelles dans un rapport de 2,7 : 1. Les femelles ont pondu entre la mi-mai et le début de juin et elles pondaient significativement plus d’oeufs/fascicule sur le tiers distal des branches et sur le tiers inférieur de la cime. Les larves se sont nourries pendant tout le mois de juin. La proportion des prénymphes qui sont demeurées dans le sol durant plus de 1 an variait de 9 à 66% d’un endroit à l’autre. Il ne semblait pas y avoir d’oeufs parasités et la survie a excédé 95% durant chacune des 2 années. Une nouvelle espèce de nématode (Steinernema sp.) (Nematoda : Steinernematidae) a été trouvée chez des pronymphes. Homaspis interrruptus (Provancher) (Hymenoptera : Ichneumonidae) parasitait les larves et a atteint le stade d’adulte ailé chez 8,5% des pronymphes d’une population et chez 2,8% des pronymphes d’une autre.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 6 , December 1999 , pp. 729 - 742
Copyright
Copyright © Entomological Society of Canada 1999

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