California Pest Rating Proposal for Phytophthora cactorum (Lebert & Cohn) J. Schröt. 1886 Pest Rating: B PEST RATING PROFILE Initiating Event: None.  The current risk and status of Phytophthora cactorum in California are reassessed and a permanent rating is proposed. History & Status: Background:  Phytophthora cactorum is an oomycete pathogen that has a very wide … Continue reading Phytophthora cactorum (Lebert & Cohn) J. Schröt. 1886 →