Fungicide Resistance in Pythium and Phytophthora from Ornamentals in Georgia

摘要

The majority of root and crown diseases on ornamental crops are caused by oomycete pathogens, including species of Pythium and Phytophthora. Both Pythium and Phytophthora cause root, crown, stem, and foliage blights. Symptoms often include root softening, sloughing, darkening of roots, crowns and stems, wilting, foliage chlorosis, leaf drop, stem dieback, and leaf and petiole blighting.