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
microconidia of Calonectria pteridis (click on image to enlarge it)
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.

Cylindrocladium pteridis