Aglaonema Diseases
Gary W. Moorman, Professor of Plant Pathology
| Disease | Symptoms | Pathogen/Cause | Management |
|---|---|---|---|
| ANTHRACNOSE | Circular to oval brown leaf spots have a yellow halo. Spots may become 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 irregular in shape, tan, dark brown or black. | Pseudomonas cichorii, Erwinia chrysanthemi, or 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 form in concentric rings within the spots on the underside of the leaf. | Myrothecium roridum | Do not apply excessive amounts of nitrogen fertilizer. |
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