Aglaonema Diseases

Disease	Symptoms	Pathogen/Cause	Management
Anthracnose	Circular to oval brown leaf spots have a yellow halo. Spots may becomhe 2 inches in diameter and contain tiny black fungal fruiting structures.	Colletotrichum	Avoid overhead watering.
Bacterial Leaf Spot	Small gray or dark green leaf spots enlarge and become irregularly, tan, dark brown, or black.	Pseudomonas cichorii, Erwinia chrysanthemi, Xanthomonas campestris dieffenbachiae	Purchase plants free of the disease. Remove infected leaves and water in a manner that keeps the surface of the leaves dry.
Copper Deficiency	New leaves are yellow, strap-shaped, or distorted.	Lack of copper	Apply a micronutrient that contains copper. Damaged leaves will not recover. New foliage will form normally.
Myrothecium Leaf Spot	Large gray-brown, oval leaf spots form at leaf tips or margins. Fungal structures worm in concentric rings within the spots on the underside of the leaf.	Myrothecium roridum	Do not apply excessive amounts of nitrogen fertilizer.