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OVIPOSITION AND FECUNDITY OF PINE FALSE WEBWORM (HYMENOPTERA: PAMPHILIIDAE)

Published online by Cambridge University Press:  31 May 2012

D. Barry Lyons
D. Barry Lyons
Affiliation:
Natural Resources Canada, Canadian Forest Service, PO Box 490, Sault Ste. Marie, Ontario, Canada P6A 5M7
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Abstract

Oviposition and fecundity of the pine false webworm, Acantholyda erythrocephala (L.), were investigated in the field and in controlled environments in the laboratory. Females mated and began ovipositing soon after emergence from the soil. Most eggs were mature and ready for deposition at female emergence. Potential fecundity of females at emergence from the ground was a linear function of adult wet or dry weight. However, a few eggs matured following emergence of the females from the soil. The amount of defoliation of the host plant caused by the sawfly in the previous year was inversely related to size and potential fecundity of emerging adults.

Realized fecundity was independent of temperature over the range of rearing temperatures examined. Mean realized fecundity at constant temperatures ranged from 32.9 eggs per female at 14.9°C to 42.0 eggs per female at 26.6°C. These differences were not statistically significant. Oviposition and ageing rates were temperature dependent. Average female longevity ranged from 27 days at 14.9°C to 6.6 days at 26.6°C. Females were diurnal and oviposition occurred during daylight hours. Oviposition pattern of the sawfly was described by a model based on temperature-dependent oviposition and ageing-rate functions. The model accurately predicted female survival and egg deposition in an outdoor insectory. However, predicted oviposition pattern of natural populations was delayed when compared with the observed pattern and may have resulted from microclimatic effects or inaccuracy of the model at low temperatures.

Résumé

La ponte et la fécondité du Pamphile introduit du pin, Acantholyda erythrocephala (L.), ont fait l’objet d’une étude en nature et dans des conditions expérimentales. Les femelles s’accouplent et pondent peu après leur sortie du sol. La plupart des oeufs sont à maturité et prêts à être pondus au moment de l’émergence de la femelle. La fécondité potentielle des femelles à l’émergence du sol est une fonction linéaire de la masse sèche ou fraîche de l’adulte. Cependant, quelques oeufs continuent leur maturation après la sortie des femelles du sol. L’importance de la défoliation de la plante hôte par les mouches à scie au cours de l’année précédente est en relation inverse avec la taille et la fécondité potentielle des adultes à l’émergence.

La fécondité réelle s’est avérée indépendante de la température dans la gamme des température expérimentales d’élevage. La fécondité réelle moyenne à température constante se situe entre 32,9 oeufs par femelle à 14,9°C et 42,0 oeufs par femelle à 26,6°C. Ces différences ne sont pas statistiquement significatives. Les taux de ponte et de survie dépendent de la température. La longévité moyenne des femelles a été évaluées à 27 jours à 14,9°C et à 6,6 jours à 26,6°C. Les femelles sont diurnes et la ponte se fait durant le jour. Un modèle basé sur la ponte et sur les taux de vieillissement en fonction de la température a été appliqué à la ponte de cette mouche à scie. Le modèle permet de prédire assez exactement la survie des femelles et la ponte des oeufs dans un insectarium extérium. Cependant, les prédictions du modèle chez les populations naturelles indiquaient une ponte retardée par rapport aux patterns observés, possiblement à cause d’effets du microclimat et d’inexactitudes du modèle aux basses températures.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 5 , October 1996 , pp. 779 - 790
Copyright
Copyright © Entomological Society of Canada 1996

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