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Studies on Rhizoctonia spp. isolates causing damping-off of Scots pine seedlings in Nowy Dwór forest nursery Marta Bełka

Poznan University of Life Sciences Faculty of Forestry [e-mail]

In 2004-2012 Nowy Dwór forest nursery (Lipka Forest District) was examined for Rhizoctonia spp. in soil. The population of Rhizoctonia complex, severe seedling damping-off pathogens, seems very diversified in the soil of the investigated forest nursery.

Multinucleate isolates (R. solani) were the most numerous while binucleate ones - less numerous. Binucleate isolates grew slower than the multinucleate ones in vitro. They were also less pathogenic to Scots pine (Pinus sylvestris L.) seedlings in infection experiments. This may mean that binucleate Rhizoctonia which is not very common affects health status of tree seedlings to a smaller extent than R. solani.