Calonectria pteridis
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eucalypt leaves with symptoms of infection by Calonectria pteridis (click on image to enlarge it)
Author(s): Rafael F. Alfenas, Olinto L. Pereira, Rodrigo G. Freitas, Camila S. Freitas, Miguel A.D. Dita and Acelino C. Alfenas
Source: Tropical Plant Pathology, 2013, 38, p. 407
Author(s): Rafael F. Alfenas, Olinto L. Pereira, Rodrigo G. Freitas, Camila S. Freitas, Miguel A.D. Dita and Acelino C. Alfenas
Source: Tropical Plant Pathology, 2013, 38, p. 407

microconidia of Calonectria pteridis (click on image to enlarge it)
Authors: P.W. Crous et al.
Source: Studies in Mycology (2019) 94, p. 152
Authors: P.W. Crous et al.
Source: Studies in Mycology (2019) 94, p. 152
Calonectria pteridis Crous, M.J. Wingf. & Alfenas 1993
This fungus is widely distributed and infects a variety of different plants. For example, it causes leaf spot and blight diseases on eucalypts in South America and other regions. The necrotic lesions are initially small and round, but expand and can cover large parts of the leaves, resulting in premature leaf drop and even defoliation of the eucalypt trees.
Synonyms:
Cylindrocladium pteridis