Informational table showing disease name, symptoms, pathogen/cause, and management of Syngonium diseases. Disease Symptoms Pathogen/Cause Management Bacterial Blight and Stem Rot Very dark green spots engulf the leaf in a soft rot which smells foul. Infected tissue falls away giving the leaf a tattered appearance. When stems are infected, lower leaves wilt and die. Erwinia Purchase plants free of the disease. Discard infected plants and water in a manner that keeps the surface of the plants dry at all times. Bacterial Leaf Spot Translucent spots on leaf margins become dull green with bright yellow halos. Spot size and shape are limited by leaf veins. Erwinia, Pseudomonas, Xanthomonas Purchase plants free from the disease. Discard infected plants. Avoid overhead watering. Apply a bsctericide to protect plants. Myrothecium Leaf Spot Tan to dark brown leaf spots have concentric rings and fungal fruiting structures. Myrothecium roridum Do not apply excessive amounts of nitrogen fertilizer. Protect leaves from wounding. Apply a fungicide to protect plants. Phosphorus Deficiency Plants are stunted. Lower leaves have dead spots. Lack of fertilization Apply a balanced fertilizer solution.