Trudel, Richard; Bauce, Éric; Guertin, Claude 
ORCID: https://orcid.org/0000-0002-0710-6970 et Cabana, Jean
(1999).
Diapause induction and overwintering stage in the fir coneworm (Lepidoptera: Pyralidae)
Canadian Entomologist
, vol. 131
, nº 6.
pp. 779-786.
Résumé
A laboratory experiment was conducted to identify the overwintering stage of the fir coneworm, Dioryctria abietivorella (Grote), in eastern Canada and determine the influence of photoperiod on diapause induction. ln another experiment, different developmental stages were exposed to field conditions to evaluate their capacity to survive the overwintering period. lnsects were either placed in the duff or exposed to ambient (above ground) conditions to assess the importance of overwintering site on winter survival. Exposure of the fir coneworm to constant short-days or a daily decreasing photoperiod during larval development induced almost all insects to initiate diapause at the fifth instar. Third-, fourth-, and fifth-instar larvae survived the overwintering period when placed in the duff. Because the fir coneworm must leave its host tree and drop to the ground to avoid rigorous winter conditions, we concluded that only fifth-instar larvae couId resume development in spring using such a strategy.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | insect, coneworm, Dioryctria abietivorella, overwintering period, diapause induction, photoperiod, survival |
| Centre: | Centre INRS-Institut Armand Frappier |
| Date de dépôt: | 07 juill. 2025 18:47 |
| Dernière modification: | 07 juill. 2025 18:47 |
| URI: | https://espace.inrs.ca/id/eprint/15219 |
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