What is the most common fungus found in California?

The most common fungus found in California is indeed brown rot. This fungal disease primarily affects fruit trees, especially those in the stone fruit category, such as peaches, plums, and cherries. Brown rot is characterized by the rapid decaying of fruits and can lead to significant losses in agricultural production if not managed properly.

The environment in California, with its warm and often dry conditions, can create favorable conditions for the growth of brown rot fungus, particularly during periods of wet weather which can facilitate spore dispersal. Understanding the prevalence and impact of brown rot is essential for effective agricultural practices and crop management in the region.

While other types of rot, such as white rot, red rot, and black rot, may also be present, they are not as commonly encountered in California as brown rot. Each of these fungi has different host preferences and conditions under which they thrive, making brown rot particularly significant in the context of California's agriculture.