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Predicting the seasonal development of the yellowheaded spruce sawfly (Hymenoptera: Tenthredinidae) in eastern Canada

Published online by Cambridge University Press:  02 April 2012

Jacques Régnière*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, 1055 du P.E.P.S., P.O. Box 10380, Stn. Sainte-Foy, Québec, Quebec, Canada G1V 4C7
Dan Lavigne
Affiliation:
New Brunswick Department of Natural Resources, Hugh John Flemming Forestry Centre, 1350 Regent Street, Fredericton, New Brunswick, Canada E3C 2G6
Alain Dupont
Affiliation:
Société de protection des forêts contre les insectes et maladies, 1780, rue Semple, Québec, Québec, Canada G1N 4B8
Nelson Carter
Affiliation:
New Brunswick Department of Natural Resources, Hugh John Flemming Forestry Centre, 1350 Regent Street, Fredericton, New Brunswick, Canada E3C 2G6
*
1Corresponding author (e-mail: jacques.regniere@nrcan.gc.ca).

Abstract

Degree-day phenology models for the yellowheaded spruce sawfly, Pikonema alaskensis (Rohwer), were developed from data sets collected in infested plantations of black spruce, Picea mariana (Mill.), and white spruce, P. glauca (Moench) Voss, in New Brunswick and Quebec, Canada, between 1995 and 1999. The models describe the relationships between degree-day accumulation (above −1 °C, from 1 April) and cumulative adult emergence, capture in pheromone traps, the dates of appearance of first adult, egg, and larva, and the relative frequency of successive larval stages. The models predict adult emergence with a precision of ±2 days and male catch in pheromone traps with a precision of ±1.6 days. The first adult, first egg, and first larva occurred after 527 ± 42, 660 ± 52, and 725 ± 18 degree-days above –1 °C, respectively, and the dates of these events are predicted within ±1.8 days. The dates of 50% occurrence of the successive instars are predicted within 4.5 days of observed dates, and the date of peak 2nd instar is predicted within ±3.6 days.

Résumé

Des modèles phénologiques de degrés-jours pour la tenthrède à tête jaune de l'épinette, Pikonema alaskensis (Rohwer), ont été ajustés à partir de données récoltées dans des plantations infestées d'épinette noire, Picea mariana (Mill.), et blanche, P. glauca (Moench) Voss, au Nouveau-Brunswick et au Québec (Canada) entre 1995 et 1999. Les modèles décrivent la relation entre l'accumulation de degrés-jours au dessus de –1 °C à partir du 1er avril, et l'émergence cumulative des adultes, la capture des mâles dans des pièges à phéromones, l'apparition du premier adulte, œuf ou larve, et la fréquence relative des stades successifs de développement larvaire. Les modèles permettent de prédire l'émergence des adultes avec une précision de ±2 jours, et la capture des mâles dans les pièges à phéromones avec une précision de ±1.6 jours. L'apparition du premier adulte, œuf et larve s'est produite après 527 ± 42, 660 ± 52 et 725 ± 18 degrés-jours au dessus de –1 °C, respectivement, et les dates de ces événements sont prédites à ±1.8 près. Les dates auxquelles 50 % des individus atteignent chaque stade larvaire successif sont prédites à ±4.5 jours des dates observées, et la date du pic du 2e stade larvaire est prédite avec une précision de ±3.6 jours.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2007

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