Number of plants with aboveground disease symptoms, belowground disease symptoms (root rot), and area under the disease progress curve (AUDPC) for Rhododendron catawbiense ‘Boursault' (Trial 1), ‘Roseum Elegans' (Trial 2), and R. ‘Roseum Pink' (Trial 3) grown in a noninfested potting medium (Control) or in media infested with Phytophthora plurivora or P. cinnamomi at 1 ppg or 100 ppg.z