Phytophthora & Pythium Root Rots

by Coralie Farinas, Nancy J. Taylor & Francesca Peduto Hand

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Pythium and Phytophthora, also known as water molds, are fungus-like organisms that cause damping-off of pre- or post-emerged seedlings, as well as root and crown rot diseases on mature plants. The pathogens are ubiquitous in soils and they are present worldwide, infecting a wide range of greenhouse floral crops, including begonia, cockscomb, geranium, gerbera daisy, madagascar periwinkle, new guinea impatiens, petunia, poinsettia, snapdragon, and vinca.