First report of Fagus sylvatica infection by Fusarium avenaceum in forest container nurseries in Northeastern Poland.
Container nurseries in northeastern Poland annually provide several million tree seedlings used for afforestation of post-agricultural soils and restocking of forests. Beech (Fagus sylvatica), one of the main forest tree species in Poland, is largely applied in this process. In container nurseries of young beech saplings, symptoms of wilting and damping off were observed. The average rate of damage in container cultures was 21 to 31%, including those beech seedlings (5 to 7%) that eventually succumbed. Based on morphological characteristics, DNA sequence analysis and pathogenicity tests, the causal agent was identified as Fusarium avenaceum [Gibberella avenacea]. This is thought to be the first report of Fusarium avenaceum disease of beech in container nurseries in Poland.