Abstract
Results of the first studies in Poland on <em>Cristulariella depraedans</em>, the causal agent of necroses on tree and shrub leaves, are presented. The fungus was recorded on <em>Acer platanoides, A. pseudoplatanus</em> and eight other species of trees and shrubs, including <em>Corylus avellana, Fagus sylvatica, Lonicera xylosteum</em> and <em>Padus avium</em> that were not previously known as hosts of the fungus. The disease symptoms, which depend on the host plant species, the size and number of necrotic lesions on leaves, and the morphological features of the fungal propagules were characterized.
Highlights
Many and various symptoms with abiotic and biotic causes occur on leaves of maple trees, Acer platanoides L. and A. pseudoplatanus L
Similar associations were reported by Wulf (1990), who found 12 species of fungi on leaves of A. pseudoplatanus within the necrotic tissues of galls caused by Dasineura vitrina Kieffer
Cristulariella depraedans was recorded in four localities in the south of Poland (Tab. 1)
Summary
Many and various symptoms with abiotic and biotic causes occur on leaves of maple trees, Acer platanoides L. and A. pseudoplatanus L. Some of them are recognizable.These include symptoms caused by fungi, e.g. Rhytisma acerinum (Pers.) Fr. and R. punctatum (Pers.) Fr. The joint action of fungi and gall-forming insects in the development of necroses can make the diagnosis of their causal agents difficult. Kowalski (2003) recorded 18 species of fungi within the necrotic areas accompanying the galls caused by Drisina glutinosa Giard. Similar associations were reported by Wulf (1990), who found 12 species of fungi on leaves of A. pseudoplatanus within the necrotic tissues of galls caused by Dasineura vitrina Kieffer. A great variety of fungi can infect maple leaves and recognition of symptoms and signs caused by individual potential causal agents is necessary
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