Two experiments were conducted to test the hypothesis that white spruce (Picea glauca (Moench) Voss) is less liable than lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) to be attacked by Alberta isolates of Armillaria. In the first experiment, 27 two-year-old containerized pine and spruce were inoculated with each of 19 different isolates representing North American biological species (NABS) I and V, the Foothills variant of NABS I, and A. mellea s.str. In the second experiment, 10 containerized seedlings of both species were inoculated with eight different isolates of NABS I and transferred to 2-L pots 2 months later. Inoculum survived better in association with spruce seedlings than with pine. In both experiments, spruce seedlings were more frequently infected than pine seedlings, and more likely to die when infected, although this difference was significant only in the first experiment. Favoring or planting spruce on sites with Armillaria root rot, therefore, cannot be recommended in Alberta.
443 (Pilze und Bakterien) 174.7 (Coniferae [Siehe Anhang D]) 181.4 (Reaktion auf und Widerstandsfähigkeit gegen biotische Einflüsse, Feuer und Verunreinigungen der Umwelt [siehe vorzugsweise die Untertitel von 4])
