There are 12 or more genera of palms and several different leaf-spot fungi. The genera of palms, each with an assigned number, are listed below. 1,3,4,5,7,9,12 Cylindrocladium sp. If palms are used for food purposes, coppers are the only approved fungicide. Use a spreader-sticker with coppers and mancozeb.
Research data are unavailable.
Use iprodione at 10-14 day intervals. Vinclozolin is for areca palm. Removal of diseased plant parts and maintenance of foliage under dry conditions will aid control.