(Phytophtora spp.) - Phytophtora root rots are pathogens that target a plant's root system and reduce the ability for the plant to transport water and nturients. It exists typically as a parasite in a variety of plant hosts, and manifests itself most obviously through rotting of the stem, crown, and roots of a plant. While infection begins most oftentimes in the roots, aboveground symptoms can sometimes be presented first.