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GONADAL DEVELOPMENT AND EGG-LAYING RESPONSE OF FEMALE WHITE PINE WEEVILS REARED ON ARTIFICIAL AND NATURAL DIETS

Published online by Cambridge University Press:  31 May 2012

Richard Trudel
Affiliation:
Centre de recherche en biologie forestière, Département des sciences du bois et de la forêt, Université Laval, Sainte-Foy, Quebec, Canada G1K 7P4
Robert Lavallée
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, P.O. Box 3800, Sainte-Foy, Quebec, Canada G1V 4C7
Éric Bauce
Affiliation:
Centre de recherche en biologie forestière, Departement des sciences du bois et de la forêt, Université Laval, Sainte-Foy, Quebec, Canada G1K 7P4

Abstract

Reproductive processes in female Pissodes strobi (Peck) fed with a 5% ground bark artificial diet following summer emergence were studied. Females exposed to different temperature and photoperiod regimes were dissected every other week and their reproductive organs were observed to evaluate the maturation time according to the treatments. After 12 weeks, half the females were transferred onto lateral branch sections of white pine and the other half onto artificial diet supplemented with 10% ground bark of white pine, and their realized fecundity was determined. During the first 12 weeks, ovary development was detected but very few mature oocytes were found. No significant differences were observed for the maturation times between the different abiotic conditions used, but significant differences were observed in female egg-laying response on natural and artificial diets. Females that completed their sexual maturation at 24 °C and 16L: 8D laid over a 3-week period 14.4 ± 8.8 (mean ± SE) and 2.6 ± 2.6 eggs per female on white pine sections and artificial diet, respectively. Oviposition behaviour was compared with results from an earlier experiment conducted with spring-emerging white pine weevils on natural and artificial substrates. The egg-laying responses on white pine seedlings and on an artificial diet with a concentration of 15% ground white pine bark were 0.892 ± 0.124 and 0.171 ± 0.394 eggs per female per day, respectively.

Résumé

Une étude a été réalisée dans le but d’obtenir de l’information sur le processus reproductif de femelles Pissodes strobi (Peck) nourrit avec de la nourriture artificielle contenant 5% d’écorce broyée, immédiatement après leur émergence estivale. Des femelles soumises à différentes conditions de températures et de photopériodes ont été disséquées à toutes les deux semaines et leurs organes reproducteurs ont été observés pour évaluer le temps de maturation selon les traitements. Après 12 semaines, la moitié des femelles ont été transférées sur des sections de branches latérales de pin blanc et l’autre moitié sur de la nourriture artificielle à laquelle a été ajouté 10% d’écorce de pin blanc broyée. Leur capacité de ponte a par la suite été déterminée. Pendant les 12 premières semaines, un développement au niveau des ovaires a été noté, mais très peu d’ovocytes matures ont été observés dans les ovarioles. Aucune différence significative n’a été constatée entre les différentes conditions abiotiques, en ce qui concerne les temps de maturation, mais des différences significatives ont été observées entre les taux de ponte des femelles sur les substrats naturel et artificiel. Les femelles qui ont complété leur maturation sexuelle à 24 °C et 16L : 8D ont pondu respectivement sur une période de 3 semaines 14,4 ± 8,8 (moyenne ± SE) et 2,6 ± 2,6 oeufs par femelle sur des sections de pin blanc et sur de la nourriture artificielle. Le comportement d’oviposition a été comparé à des résultats obtenus antérieurement lors d’une étude réalisée avec des charançons du pin blanc de printemps en présence de substrats naturel et artificiel. Le taux de ponte des femelles sur les semis de pin blanc et sur de la nourriture artificielle composée de 15% d’écorce de pin blanc broyée ont été respectivement de 0,892 ± 0,124 et 0,171 ± 0,394 oeufs par femelle par jour.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1998

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