Informational table showing disease name, symptoms, pathogen/cause, and management of Exacum diseases. Disease Symptoms Pathogen/Cause Management Basal Stem Rot and Branch Blight At high temperatures, wounded stems are killed quickly. Nectria haematocca Maintain moderate temperatures. Avoid wounding plants. Botrytis Blight Stems of established plants rot at the soil line. This may occur just as plants flower, killing the entire plant. Botrytis cinerea Heat and ventilate to maintain low humidity. Remove dead and dying tissue from the greenhouse. Apply a fungicide to protect plants. Pythium Root Rot Plants wilt, collapse and die. Roots appear water-soaked, limp, and brown. Pythium Use pasteurized potting soil. Discard infected plants.

Prepared by Gary W. Moorman, Professor of Plant Pathology