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DIFFERENCES IN POSTDIAPAUSE DEVELOPMENT AMONG GEOGRAPHICALLY DISTINCT POPULATIONS OF THE LARCH SAWFLY, PRISTIPHORA ERICHSONII (HYMENOPTERA: TENTHREDINIDAE)

Published online by Cambridge University Press:  31 May 2012

R. J. Heron
R. J. Heron
Affiliation:
Great Lakes Forest Research Centre, Canadian Forestry Service, Sault Ste. Marie, Ontario
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Abstract

Distinct differences were observed in postdiapause development and prolonged diapause of the larch sawfly, Pristiphora erichsonii (Hartig), obtained from the vicinity of Tazin River, Northwest Territories; near Riverton, Manitoba; and near Renovo, Pennsylvania. All populations had been reared under controlled laboratory conditions (21°±0.5 °C, 50±10% relative humidity, and a 15-hr daily photophase) for two or more generations.

After 280 days cold treatment at 3°±1 °C, cocoons were dissected and the number of pronymphs and eonymphs was determined. Insects from each population were then reared at 5°, 10°, and 15 °C. Times to adult emergence, duration of individual stages, and numbers remaining in prolonged diapause at each temperature were determined.

The most significant differences occurred among populations reared at 5 °C. At this temperature, the times to adult emergence and the duration of individual stages of development and the proportions remaining in prolonged diapause or arrested development, increased from northern to southern latitudes. Less significant population differences were noted at 10° and 15° than at 5 °C.

Résumé

Observation de nettes différences dans la croissance après diapause et la diapause prolongée de la Tenthrède du Mélèze, Pristiphora erichsonii (Hartig), obtenue au voisinage de Tazin River (Territoires du Nord-Ouest), près de Riverton (Manitoba) et non loin de Renovo (Pennsylvanie). L’élevage de toutes les populations avait eu lieu sous des conditions expérimentales déterminées (21±0.5 °C, 50±10% d’humidité et photophase de 15 heures par jour) pendant deux générations ou plus.Dissection des cocons après traitement à froid de 280 jours à 3±1 °C, et dénombrement des pronymphes et des éonymphes. Puis élevage des insectes provenant de chaque population, sous 5, 10 et 15 °C. Détermination des délais respectifs pour l’émergence des adultes, de la durée des diverses phases de croissance et des chiffres de sujets restant en diapause prolongée à chacune de ces températures.

Observation des principales différences parmi les populations élevées sous 5 °C. A cette dernière température les délais pour l’émergence des adultes, la durée des diverses phases de croissance et les proportions de sujets restant en diapause prolongée ou en état de croissance arrêtée, augmentaient des latitudes nord aux latitudes sud. Relevé de différences moins importantes à 10 et 15 °C qu’à 5 °C.

Type
Articles
Information
The Canadian Entomologist , Volume 104 , Issue 8 , August 1972 , pp. 1307 - 1312
Copyright
Copyright © Entomological Society of Canada 1972

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