|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
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