Przyczyny zamierania liści powojnika (Clematis L.)

Abstract

Dying clematis leaves were observed during a two-year study (2011–2012) conducted in the city of Krakow, Poland. The dying leaves showing symptoms of necrosis contained 46 fungi species. Alternaria alternata and Epicoccum nigrum dominated in the clematis phyllosphere. Arthinium phaeospermum, Boeremia exigua, Botrytis cinerea, Chaetomium globosum, Cladosporium cladosporioides, Fusarium oxysporum, Gibberella baccata, G. tricincta, Penicillium expansum, Pestalotiopsis sydowiana, Phoma glomerata, Ph. medicaginis, Pleurostomophora richardsiae and others occurred in large numbers. The dynamics of leaf colonization by fungi causing necrosis increased during the vegetation period. In November 2012, over 60% more of the fungous colonies were isolated in comparison with the number isolated in July. The most infected plants grew nearer to the acoustic screen. Kacper and Polish Spirit were the most infected cultivars, whereas Etoile Violette and Maidwell Hall were the least infected. The occurrence of fungi resulted in the considerable worsening of the decorative values of the plants.