Gnomoniopsis smithogilvyi

Gnomoniopsis smithogilvyi, known as the chestnut rot fungus, is a species of fungus in the family Gnomoniaceae. It causes chestnuts to rot, preventing their use as food.

Causal Agent
It is the causal agent of chest brown rot. It's also known as the chest nut pathogen. The fungus has both endophytic and pathogenic lifestyles. Under the appropriate conditions, G. smithogilvyi becomes pathogenic, infecting nuts early in the season and turning the solid nut endosperm into a chalky and soft tissue of no marketable value.