Cytospora ceratosperma

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Cytospora ceratosperma on Juglans regia - a–b) conidiomata on branch, c-d) sections through conidioma, e-f) conidiogenous cells and conidia - scale bars: a = 1 mm; b–d = 0.5 mm; e –f = 10 μm (click on image to enlarge it)
Author(s): X.L. Fan et al.
Source: Persoonia (2020) 45 p. 18

Cytospora ceratosperma (Tode) G.C. Adams & Rossman 2015

This fungus causes a form of apple Valsa canker, see also Cytospora mali. Pear trees may also become infected. C. ceratosperma has been mainly reported from eastern Asia. It enters the trunk through small wounds and disease symptoms develop predominantly in spring and early summer. Cankers are formed and the disease results in dead branches and in serious cases causes tree mortality.

Synonyms:
Valsa ceratosperma
Valsa rubi