red rot

Noun

 * 1) A degradation process in vegetable-tanned leather, caused by humidity, environmental pollution, and high temperature, and resulting in a powdery surface and structural weakness.
 * 2)  A degradation process in brass where chemical dezincification of the brass alloy leaves behind fragile or powdery copper metal.
 * 3)  A disease of sugar cane caused by the fungus.