caa a22 4500 388093056 CHVBK 20180307125256.0 cr unu---uuuuu 161130e199912 xx s 000 0 eng 10.4039/Ent131779-6 doi S0008347X00011184 pii (NATIONALLICENCE)cambridge-10.4039/Ent131779-6 DIAPAUSE INDUCTION AND OVERWINTERING STAGE IN THE FIR CONEWORM (LEPIDOPTERA: PYRALIDAE) [Elektronische Daten] 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. In another experiment, different developmental stages were exposed to field conditions to evaluate their capacity to survive the overwintering period. Insects 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 could resume development in spring using such a strategy. Copyright © Entomological Society of Canada 1999 Trudel Richard Centre de recherche en biologie forestière, Département de foresterie et géomatique, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4 Bauce Éric Centre de recherche en biologie forestière, Département de foresterie et géomatique, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4 Guertin Claude Institut Armand-Frappier, Centre de recherche en virologie, Laval, Québec, Canada H7N 423 Cabana Jean Ministère des Ressources naturelles du Québec, Direction de la recherche forestière, Sainte-Foy, Québec, Canada G1P 3W8 The Canadian Entomologist Cambridge University Press 131/6(1999-12), 779-786 0008-347X 131:6<779 1999 131 TCE https://doi.org/10.4039/Ent131779-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131779-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Trudel Richard Centre de recherche en biologie forestière, Département de foresterie et géomatique, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4 NATIONALLICENCE 700 1- Bauce Éric Centre de recherche en biologie forestière, Département de foresterie et géomatique, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4 NATIONALLICENCE 700 1- Guertin Claude Institut Armand-Frappier, Centre de recherche en virologie, Laval, Québec, Canada H7N 423 NATIONALLICENCE 700 1- Cabana Jean Ministère des Ressources naturelles du Québec, Direction de la recherche forestière, Sainte-Foy, Québec, Canada G1P 3W8 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/6(1999-12), 779-786 0008-347X 131:6<779 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge