Cercospora zeina

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Cercospora zeina (click on image to enlarge it)
Author(s): Pedro W. Crous, Johannes Z. Groenewald, Marizeth Groenewald, Pat Caldwell, Uwe Braun and Thomas C. Harrington
Source: Studies in Mycology, 2006, 55, p. 195

Cercospora zeina Crous & U. Braun, 2006

This fungus has been found in the Americas, Africa and Asia and causes a gray (grey) leaf spot disease on maize, similar to Cercospora zeae-maydis which also causes gray leaf spot. However, it produces no cercosporin in vitro. It has been previously described as type II of C. zeae-maydis. The elongated leaf lesions are confined to the veins, are up to 4 cm long and coalescing. The conidia have similar dimensions compared to those of C. zeae-maydis.

"C. zeina can be distinguished by having shorter conidiophores (up to 100 μm) and more broadly fusiform conidia, versus longer conidiophores (up to 180 μm) and broadly obclavate - subcylindrical conidia of C. zeae-maydis. Colonies of C. zeina grow more slowly in culture and lack the red pigment associated with cercosporin production, typical of C. zeae-maydis." (Crous et al. 2006)