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INDUCTION OF PROLONGED DIAPAUSE IN BARBARA COLFAXIANA (LEPIDOPTERA: OLETHREUTIDAE): CORRELATIONS WITH CONE CROPS AND WEATHER

Published online by Cambridge University Press:  31 May 2012

A. F. Hedlin ,
G. E. Miller  and
D. S. Ruth
A. F. Hedlin
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
G. E. Miller
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
D. S. Ruth
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia V8Z 1M5
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Abstract

Studies were carried out in the field and in the laboratory to determine if prolonged diapause of the Douglas-fir cone moth, Barbara coifaxiana (Kearfott), was correlated with the sizes of the cone crops maturing in the year of larval feeding (N) and in the year following larval feeding (N + 1), and to determine if weather during the period of larval feeding (year N) influenced the size of the maturing cone crop or the incidence of prolonged diapause the following year (N + 1). Field studies showed that prolonged diapause induction in B. coifaxiana was not rank correlated (but approached significance) with the size of the cone crop maturing in year N, but was negatively rank correlated with that in year N + 1. Two of seven weather parameters, mean maximum temperature and mean daily temperature, measured during the larval feeding period were positively rank correlated with cone crop size. No parameter was correlated with the incidence of prolonged diapause. In the laboratory, the incidence of prolonged diapause was negatively correlated with temperature. Photoperiod and parental diapause habit had no direct effect.

Résumé

Des études ont été effectuées en plein champ et au laboratoire, à l'effet de déterminer si l'incidence de la diapause prolongée chez le perce-cône du Douglas, Barbara coifaxiana (Kft.) était en corrélation avec l'importance de la récolte de cônes en voie de maturation dans l'année (N) où les larves s'alimentent et dans l'année suivante (N + 1), et si les paramètres du temps survenant au cours de la période d'alimentation des larves (année N) influaient sur l'importance de la récolte de cônes en voie de maturation ou bien sur l'incidence de la diapause prolongée l'année suivante (N + 1). Les études en plain champ ont montré que l'induction de la diapause prolongée chez B. coifaxiana n'était pas en corrélation des rangs (mais s'approchait d'une différence significative) avec l'importance de la récolte de cônes en voie de maturation de l'année N, mais était en corrélation des rangs négative avec celle de l'année N + 1. Deux des sept paramètres du temps, la température maximum moyenne et la température quotidienne moyenne, mesurés durant la période d'alimentation des larves étaient en corrélation des rangs positive avec l'importance de la récolte de cônes. Aucun paramètre n'était en corrélation avec l'incidence d'une diapause prolongée. Au laboratoire, l'incidence de la diapause prolongée était en corrélation négative avec la température; la photopériode et la parentage étaient sans effet.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 6 , June 1982 , pp. 465 - 471
Copyright
Copyright © Entomological Society of Canada 1982

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