Infected plants may appear to be sprinkled with baby powder or covered in cobwebs. Infected plant parts may be deformed; badly infected leaves may drop. Q: What are the “white spots” on my Japanese maple leaves? The first tar spot symptoms usually show up in early summer as small (less than 1/8 inch diameter), light-green to yellowish-green spots. the fungus keeps growing when leaves fall off for as long as the weather stays moist – which, for fallen leaves, is all winter long. Like leaf spot and anthracnose, the worst-case scenario is defoliation. Tar Spot can look extremely bad in some cases, but rarely does it ever cause more than an aesthetic blemish to your tree. Natural Cures for Mold on African Violet Flowers, Sprays That Control the Japanese Plum Tree Diseases, Missouri Botanical Garden: Powdery Mildew, Clemson Cooperative Extension: Powdery Mildew, The Old Farmer's Almanac: Rust Plant Disease, Clemson Cooperative Extension: Gardenia Diseases & Other Problems, Missouri Botanical Garden:Pesticides: Sulfur, Missouri Botanical Garden: Pesticides: Neem, Missouri Botanical Garden: Azadirachta Indica, Virginia Cooperative Extension: Pesticides and Aquatic Animals: A Guide to Reducing Impacts on Aquatic Systems, Missouri Botanical Garden: Pesticides: Copper, University of Wisconsin Extension: Master Gardener Program: Powdery Mildew, Queensland Department of Agriculture, Fisheries and Forestry: Pests of Ornamental Plants and Gardens, Purdue Extension: Using Organic Fungicides, Colorado State University Cooperative Extension: Some Pesticides Permitted in Organic Gardening, Organic Solutions for Removing Mildew on Plants. Tiny growths, approximately 0.125 inches in size, occur primarily on the upper surfaces of maple leaves. The white spots of powdery mildew will spread to cover most of the leaves or affected areas. The most effective way to manage rust is prevention, including cultural controls and use of a sulfur-based fungicide. Hello, we met some of your folks at the CNE and they recommended we email you our question. It's caused by a fungal pathogen in the genus Rhytisma. To help protect fish from pesticide exposure, read the product label to find how far from a body of water you may safely use the product and never apply it on a windy, rainy day. Fungicides purchased from your local garden center can be applied during the growing season as soon as you notice white patches on the maple leaves. What Ortho Product to Use for Peach Leaf Curl? A white fungus known as powdery mildew is one of several leaf diseases prone to attacking the brightly colored Japanese maple tree, Acer palmatum. 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