Stenocarpella maydis

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Stenocarpella maydis symptoms on corn cob (click on image to enlarge it)
Source: Clemson University - USDA Cooperative Extension Slide Series - IPM Images
Stenocarpella maydis conidia (click on image to enlarge it)
Author(s): Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images

Stenocarpella maydis (Berk.) B. Sutton, 1980

This fungus is widely distributed, mainly in tropical and subtropical regions. It causes stalk and ear rot on maize. Stalk infections result in decay of the pith tissue, water stress, premature wilting and leaf senescence. Infections of the ears start with a white mould at the base that spreads towards the tip and finally covers the whole cob. Both types of diseases can cause significant yield losses of more than 30% (e.g. see da Costa et al., 2019). In addition, the fungus produces mycotoxins that contaminate the grain.

S. maydis forms black pycnidia that produce 2-celled conidia. These disperse through rain splashes and are also airborne (Casa et al., 2004). The fungus persists between seasons on contaminated seeds, in plant debris and in the soil. A sexual stage has not been described.

Synonyms:
Diplodia maydis
Sphaeria maydis