Often, the spots have irregular, feathery borders, and sometimes yellowing may appear around the lesions. 1) Brown/black streaks and patches on the stems. The mold forms from excess sugar byproducts in insect wastes, and treating insect issues is essential to eliminate the mold. Initial leaf spots are usually round to oval in shape and vary in color from yellow to brown to black. All palms should be considered hosts for leaf spots and leaf blights, especially in the seedling and juvenile stages. Black Spot. I have a big indoor Kentia palm with multiple problems that I'm really worried about. The initial size may be as small as a pin point. Do not mist the leaves. There seem to be a lot of palm experts here, so I'm really hoping someone can help me. 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. Remove the diseased leaves and spray with Benlate (follow the instructions exactly). Palm trees often grow in areas where frequent rainfall, tropical storms, and high levels of humidity are the norm. Black spot overwinters in fallen leaves and branches. Leaf spot is a condition caused by fungus and bacteria that result in dark, black splotches to form on the leaves of infested plants. These spots are mainly a cosmetic issue, but severe cases can be detrimental to the plants health. Tom Cole, head of horticulture and landscaping from Capel Manor College, advises us on the best way to deal with black spot leaf disease. Hi! Some leaf spots initially appear as water-soaked lesions (Fig. 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). These diseases include diamond scale, Gliocladium blight, Graphiola leaf spot, and tar spot. 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 -- … 1). The leave tissue surrounding the spots turns yellow. Looks pretty serious and I have no idea what's going on. 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. Palm trees often grow in areas where frequent rainfall, tropical storms, and high levels of humidity are the norm. Usually lower leaves are infected first, and infected leaves often fall off the plant early. Leaf Spot Fungus: These are also known as cercospora spp. The spots form on the upper sides of leaves. This looks like tiny black dots on the backs of the leaves of the tree. 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