Abstract
In 1999 disease symptoms on leaves of <em>Quercus robur</em> – necrosis, deformation and blackening of leaf petiole, followed by premature leaf fall were observed. <em>Tubakia dryina</em> was isolated from necrotic tissues and its pathogenicity to oak proved in infection experiments. The fungus caused necrosis of shoots and leaves. Dying leaves displayed also blackening of leaf petiole.
Highlights
Infection of Quercus robur L. leaves by several fungi results in recognizable disease symptoms
Pathogenicity tests with T. dryina yielded inconsistent results
Artificial inoculation of Q. phillyraeoides, Q. glauca and Castanea pubinervis performed by Yo koyama and Tu b a k i (1971) revealed no pathogenicity
Summary
Infection of Quercus robur L. leaves by several fungi results in recognizable disease symptoms. There are, numerous diseases causing spots on leaves. Their causing agents are difficult to identify due to lack of etiological symptoms, as it is in the case of Septoria quercicola (Desm.) Sacc., Cryptocline cinerescens (Bubak) Arx or Mycosphaerella spp. In particular, are not specific as they occur on leaves previously damaged by gall-making insects (Butin 1992). Various symptoms of unknown etiology are common on oak leaves. The conditions favouring their occurrence are not known yet (Butin 1996; Kowalski , Durak 2000). The symptoms are characterized in the work and results of investigation on the disease etiology are presented
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