https://www.chicocrop.com/fertilizer-for-eggplant/ Eggplant Disease Treatment 1. Eggplant Phytophthora Rot Eggplant Phytophthora Rot caused Phytophthora capsici. This soil-inhabiting organism causes root rot in pepper and eggplant and is most active in moist, warm weather (75°F to 91°F). Disease is generally seen in the wettest areas of a field.All Rights Reserved