Comparison of the susceptibility of Quercus petraea, Q. robur and Q. rubra to Collybia fusipes
Résumé
Collybia fusipes is the cause of a root rot of Quercus petraea, Q. robur and Q. rubra. This parasite is often reported to cause problems in stands of red oaks and field evidence suggests that this north american oak species is more susceptible than the two European oak species. We artificially inoculated young saplings of the three oak species and of chestnut, Castanea sativa, in the glasshouse, and also mature sessile and red oaks growing in the same stand to compare their susceptibility to C. fusipes. Red oak, both as young seedlings and mature trees, was clearly more susceptible to C. fusipes than sessile oak. Chestnut seedlings were as susceptible as sessile oak. Susceptibility of pedunculate oak seedlings was intermediate between red oak and sessile oak. In one experiment this species was significantly less susceptible than red oak, and in the other it was as susceptible.
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