These are not white spores, but clusters of eggs, laid by the hydrangea scale. Powdery Mildew This fungus causes white, powdery-looking patches on leaves, eventually resulting in leaf-drop. Learn how to treat the hydrangea leaf spot disease and make your plant beautiful again. If you notice the bacterial symptoms on the leaves of your hydrangea you can get a bactericide to treat the condition, remove affected leaves and prevent it from spreading. White, cottony fungal growth forms on the lower surface of the leaf. Hydrangea Scale: Hydrangea scale is probably one of the most popular pests, they are usually identified by there oval white eggs that attach themselves to the stems of the plant.The pest such the sap from the plant and cause the plants to suffer and not growth as vigorously as they would. If it isn’t a fungal or bacterial problem simply might be mildew which is technically another type of fungus. Mrs J Cole, Basildon, Essex. Phytoplasma: Discard infected plants. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. Erysiphe polygoni: Apply a fungicide as soon as any mildew is observed. Leaf spotting on hydrangea is mostly caused by the fungus Cercospora and affects most of this family of plants. Virescence: Flowers are green and may be stunted. These may become purplish. How do i deal with this fungus? In most cases these leaf spots are indicative of Cercospora leaf spot, a temporary condition caused by the fungus Cercospora hydrangea, which is perhaps the most common disease seen on hydrangeas during the months of July through October.The spots form due to water drops from rain or irrigation that sit on leaves during hot and humid conditions. Cercospora leaf spot on hydrangea, image by L. White Powdery mildew (Microsphaera penicillata) can occur on all hydrangeas but is most serious on bigleaf hydrangea. It appears as brown or purple spots on leaves during wet and humid periods. Powdery mildew is very common in ornamental plants in particular. Plants decline and die. https://gardenerspath.com/how-to/disease-and-pests/anthracnose-hydrangea Powdery mildew causes hydrangeas to develop small tufts of gray or white powdery mildew on the leaves of the plant. The spores quickly grow on the plant leaves and stems to form a white fuzz that’s also called powdery mildew. There are two types of fungal diseases can infect hydrangeas - cercospora leaf spot and anthracnose. Leaf Spot. Fungal Leaf Spots on Hydrangea Leaves. Yellow areas form on leaves. It thrives in warm temperatures over 60 degrees and is most commonly seen in summer. Leaf spot is a very common fungus that affects Hydrangeas. When the weather conditions are favorable, these areas enlarge until they cover the entire leaf surface. 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