Informational table showing disease name, symptoms, pathogen/cause, and management of Lily Of The Valley (Convallaria) diseases. Disease Symptoms Pathogen/Cause Mnaagement Southern blight Tan to mustard-colored ball-like structures (sclerotia) on the stem base near the soil. Plants wilt and die. Sclerotium rolfsii Remove and destroy infected plants. Apply a fungicide to protect plants. Leaf spots and Anthracnose Small water soaked spots enlarge and turn tan to reddish brown as the leaf yellows Ascochyta, Cercospora, Mycosphaerella, or Phyllosticta Colletotrichum or Gloeosporium species. Do not use a sprinkler to water the plants. Wet the soil rather than the plants. Apply a fungicide to protect plants. Aureobasidium leaf spot Small water-soaked spots develop which later have brown streaks with yellow halos—these spots often form from the leaf tip downward. Infected leaves die prematurely. Aureobasidium microstictum Do not use a sprinkler to water the plants. Wet the soil rather than the plants. Apply a fungicide to protect plants. Rust Small yellow leaf spots are on the upper side of the leaf while orange-brown spore masses are on the underside of the leaf. Puccinia sessilis Apply a fungicide to protect plants. Foliar nematode Areas between the veins turn yellow and then brown. Aphelenchoides spp. Water in a manner that keeps moisture off the leaves. Remove and destroy infected plants.

Prepared by Gary W. Moorman, Professor of Plant Pathology