Informational table showing disease name, symptoms, pathogen/cause, and management of Spathiphyllum diseases. Disease Symptoms Pathogen/Cause Management Cylindrocladium Root and Petiole Rot Lower leaves yellow and wilt. Dark brown spots with halos form on leaves. Roots decay. Cylindrocladium spathiphylli Purchase plants free of pathogen. Discard infected plants. Apply a fungicide to protect plants. Magnesium Deficiency Plants are stunted and vigor reduced. Tissue between leaf veins yellows and may be bronzed while veins remain green. Lack of fertilization Apply magnesium sulfate (Epsom salts) at 1/4 lb. per 10 gallons of water. Marginal Leaf Burn Leaf tips and margins yellow and die. Roots darken and die. Over-fertilization Leach pots if no slow-release fertilizer is present. Maintain moderate levels of fertilizer. Virus A mild mosaic pattern of light and dark green appears on some leaves. Other leaves, while still infected, are symptomless. Dasheen mosaic virus Discard infected plants. Maintain good insect control in the greenhouse.

Prepared by Gary W. Moorman, Professor of Plant Pathology