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Performance of the fir coneworm Dioryctria abietivorella (Grote) as affected by host species and presence or absence of seed cones

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1 Larval performance of Dioryctria abietivorella (Grote) (Lepidoptera: Pyralidae) was compared when insects were reared in white spruce, black spruce and Jack pine seed orchards. For each species, half of the insects developed in the presence of cones, while the other half was maintained on branches without cones.

2 Significantly faster development rates were observed on spruce species when compared to Jack pine. Significant differences in survival were also recorded between the different feeding treatments.

3 The presence of seed cones on spruce species significantly increased insect mean weight compared with branches without cones, but no significant differences were noticed between the different tree species with cones.

4 White spruce is the most suitable host tree for fir coneworm feeding and the availability of seed cones plays an important role in determining D. abietivorella larval performance.
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Keywords: Dioryctria abietivorella; fir coneworm; host plant; larval performance; seed cone; seed orchard

Document Type: Research Article

Affiliations: 1: Centre de Recheche en Biologie Forestière, Faculté de Foresterie et Géomatique, Université Laval, Sainte-foy, Québec, Canada, G1K 7P4, 2: INRS–Institut Armand-Frappier, Laval Québec, Canada, H7N 4Z3 and 3: Ministère des Resources Naturelles du Québec, Direction de la Recherche Forestière, Sainte-Foy, Québec, Canada, G1P 3W8

Publication date: 1999-08-01

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