Sour Rot

This disease affects California grape (Vitis californica) but limited information about symptoms, management, or economic impact is available. Minimal data exists on how to identify or control this condition. Further research is needed to understand its significance in the PNW region.

Reduce moisture around affected tissue by improving drainage and air circulation. Remove rotted material cleanly and dispose of it away from the planting area. Avoid wounding healthy tissue during cleanup, as fresh wounds create new entry points. If the problem keeps returning, evaluate whether the site is too wet or poorly drained for the species you are growing.