California Pest Rating for Phytophthora niederhauserii Abad & J. Abad, 2014 Pest Rating: B PEST RATING PROFILE Initiating Event:   None.  A permanent rating for Phytophthora niederhauserii is proposed herein. History & Status: Background: In 2003, Abad and Abad reported the discovery of a Phytophthora species associated with necrotic collars, stems and roots of arborvitae … Continue reading Phytophthora niederhauserii Abad & J. Abad, 2014 →