Orange and brown lesion on the wood and white exudate on the bark of an old avocado trunk with Phytophthora canker and collar rot caused by Phytophthora citricola.

Orange and brown lesion on wood and white crystalline exudate on bark of old avocado trunk infected with Phytophthora canker and collar rot. Fallbrook, San Diego Co.  Credit: David Rosen
Credit: David Rosen