Do not mist the leaves. The leaves may turn yellow and fall off. Initial leaf spots are usually round to oval in shape and vary in color from yellow to brown to black. Often, the spots have irregular, feathery borders, and sometimes yellowing may appear around the lesions. The fungus Diplocarpon rosae produces black spots of about 2-12 mm in diameter, usually on the upper surface of the leaf (the spots don't show up the lower surface, or underside, of the leaf). 1). Remove the diseased leaves and spray with Benlate (follow the instructions exactly). This mold appears as ashy gray or black mold on palm fronds, and while it doesn't dramatically harm the tree, it is unsightly and often unwelcome. All palms should be considered hosts for leaf spots and leaf blights, especially in the seedling and juvenile stages. The spots form on the upper sides of leaves. Some leaf spots initially appear as water-soaked lesions (Fig. Leaf spots initially start as small, water-soaked lesions that then turn various shades of yellow, gray, reddish-brown, brown, or black. Black spot is a fungal disease and it thrives in warm humid climates. Palm trees often grow in areas where frequent rainfall, tropical storms, and high levels of humidity are the norm. These diseases include diamond scale, Gliocladium blight, Graphiola leaf spot, and tar spot. The leave tissue surrounding the spots turns yellow. Black Spot. The initial size may be as small as a pin point. Leaf Spot Fungus: These are also known as cercospora spp. This looks like tiny black dots on the backs of the leaves of the tree. But these environmental factors contribute to the development of diseases that produce black spots on the palm tree, often defoliating the leaves and -- in extreme scenarios -- ⦠But these environmental factors contribute to the development of diseases that produce black spots on the palm tree, often defoliating the leaves and -- in extreme scenarios -- killing the tree. Leaf spot is a condition caused by fungus and bacteria that result in dark, black splotches to form on the leaves of infested plants. Usually lower leaves are infected first, and infected leaves often fall off the plant early. There seem to be a lot of palm experts here, so I'm really hoping someone can help me. The mold forms from excess sugar byproducts in insect wastes, and treating insect issues is essential to eliminate the mold. Palm trees often grow in areas where frequent rainfall, tropical storms, and high levels of humidity are the norm. Looks pretty serious and I have no idea what's going on. 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