Like brown rot, white rot occurs in temps between 65 and 90 degrees Fahrenheit. Whereas brown rot affects cellulose white-rot fungi break down lignin, another element of the wood’s structure, leaving the light-colored cellulose behind.
White Rot: If wood takes on a whitish or light yellow shade and feels spongy, it’s probably white rot. Brown rot thrives at temps between 65 and 90 degrees Fahrenheit, and once it starts growing, it spreads rapidly. As the cellulose is destroyed, the wood shrinks, turns deep brown in color, and breaks into small cube-shaped bits-a process known as cubical fracture. Brown Rot: Often called “dry rot” because the surface of the wood appears dry, brown-rot fungi targets cellulose in the wood’s structure. The numerous types that trigger wood rot are loosely classified by the three general effects they have on wood. While many types, such as yeast and mushrooms, are beneficial, others are destructive. Yet as many as 5 million types of fungi exist in the air and soil around us, and there’s no escaping them. 
In order for fungi to set up shop, the wood must be continuously damp fungi will not grow on dry wood. Wood rot is a form of decay triggered by the combination of moisture and fungi (microscopic organisms).
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