|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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