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Shishkoff, N. 2014. Growth-inhibiting fungicides affect detection of Phytophthora ramorum from infected foliage and roots. Online. Plant Health Progress doi:10.1094/PHP-RS-12-0124. Growth-inhibiting fungicides are used routinely to control common and regulated Oomycete pathogens. This study investigated whether such fungicides could affect detection of Phytophthora ramorum from plant tissue, both foliage and roots. Whole plants of Rhododendron x ‘Cunningham’s White’ were inoculated with P. ramorum and treated 3 days later with fosetyl-Al, mefenoxam , or propamocarb. The foliage was sampled over time to see if fungicides prevented successful culturing of the pathogen from infected leaf tissue or interfered with detection using real-time PCR or ELISA. Mefenoxam significantly reduced the ability to culture the pathogen from leaves for the first 6 weeks while recovery from leaves treated with other fungicides did not differ from water-treated controls; detection using PCR or ELISA was not affected by fungicide application. The roots of Viburnum cuttings were inoculated with P. ramorum and then treated 4 days later with fosetyl-Al, mefenoxam, or propamocarb. The amount of inoculum in flow through water samples taken weekly for 5 weeks was quantified and percent root colonization determined at the end of the experiment. Propamocarb had no effect on inoculum production or root infection, while viable inoculum production was significantly decreased in fosetylAl- or mefenoxam-treated plants over 5 weeks, and root colonization was significantly decreased.

Growth-inhibiting Fungicides Affect Detection of Phytophthora ramorum from Infected Foliage and Roots