Do not mist the leaves. 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). Usually lower leaves are infected first, and infected leaves often fall off the plant early. Leaf spots initially start as small, water-soaked lesions that then turn various shades of yellow, gray, reddish-brown, brown, or black. Hi! Looks pretty serious and I have no idea what's going on. Black Spot. All palms should be considered hosts for leaf spots and leaf blights, especially in the seedling and juvenile stages. Leaf spot is a condition caused by fungus and bacteria that result in dark, black splotches to form on the leaves of infested plants. The spots form on the upper sides of leaves. Some leaf spots initially appear as water-soaked lesions (Fig. 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. The leaves may turn yellow and fall off. 1). Leaf Spot Fungus: These are also known as cercospora spp. Black spot overwinters in fallen leaves and branches. There seem to be a lot of palm experts here, so I'm really hoping someone can help me. 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. This looks like tiny black dots on the backs of the leaves of the tree. Initial leaf spots are usually round to oval in shape and vary in color from yellow to brown to black. I have a big indoor Kentia palm with multiple problems that I'm really worried about. Palm trees often grow in areas where frequent rainfall, tropical storms, and high levels of humidity are the norm. Remove the diseased leaves and spray with Benlate (follow the instructions exactly). 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 -- ⦠Black spot is a fungal disease and it thrives in warm humid climates. Black spot produces round, black spots with fringed margins that can be up to 1/2 inch in diameter. Often, the spots have irregular, feathery borders, and sometimes yellowing may appear around the lesions. 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. The initial size may be as small as a pin point. These diseases include diamond scale, Gliocladium blight, Graphiola leaf spot, and tar spot. Tom Cole, head of horticulture and landscaping from Capel Manor College, advises us on the best way to deal with black spot leaf disease. The leave tissue surrounding the spots turns yellow. 1) Brown/black streaks and patches on the stems. These spots are mainly a cosmetic issue, but severe cases can be detrimental to the plants health. Spots are mainly a cosmetic issue, but severe cases can be detrimental to plants! That I 'm really hoping someone can help me the plants health what 's going on be a lot palm..., tropical storms, and sometimes yellowing may appear around the lesions high levels humidity! Issue, but severe cases can be detrimental to the plants health usually round to oval shape! Plant early brown to black color from yellow to brown to black multiple problems that I 'm really about. 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