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What you describe sounds like a leaf spot or blight. The difference between a leaf spot and a leaf blight concerns the degree of leaf blade damage. In general, as long as the spots are discretely separated from each other by green tissue, the disease is referred to as a spot. When these spots occur suddenly and merge together to form a larger mass of diseased tissue, the disease is referred to as a blight.
There are several causes. Palms under water stress or with poor nutrition are more likely to develop this fungal disease. A deep watering once or twice a week should be sufficient for your palm and you should feed with a specialized palm food 3-4 times a year (as recommended on the fertilizer package). Try to keep water off the tops of the leaves whenever possible to prevent splashing the fungal spores onto the healthy leaves. You may be able to protect the unaffected leaves with a fungicide (one containing chlorothalonil, iprodione or mancozeb). Be sure to apply according to label directions. Best wishes with your palm trees! |
