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It affects a wide range of plants and is caused by many different species of fungi. The powdery mildew has since then been observed on leaves and seed pods of deciduous azaleas as well as evergreen rhododendrons, although the disease is more common on taxa of deciduous azaleas. Every year trees and shrubs rely on their food reserves to push out new leaf growth. Powdery mildew on rhododendrons is a fungal infection of the leaves. Rhododendron : Powdery mildew (revision date: 3/10/2017) Use Integrated Pest Management (IPM) for successful plant problem management. On evergreen rhododendrons, light green or yellowish patches on the top of leaves sometimes accompanied by purple-brown areas on the backside of leaves are signs of powdery mildew. In 2002 a fungus causing powdery mildew on Rhododendron in Latvia was discovered and identi-fied as Erysiphe azaleae. For instance, the rhododendron cultivar 'Unique' shows almost no upper leaf change other than occasional very faint … Powdery Mildew. Powdery mildew affects various species of plants and is caused by a few closely related fung - 2ACCM64 from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Subsequent growth is dwarfed and distorted, often covered with the mildew. This disease is mostly found in humid climates, and very rarely in cold weather. leaves. Cause The fungus Erysiphe azaleae (formerly Microsphaera azaleae) is found in western Oregon and Washington and southern British Columbia on garden azalea and rhododendron species and hybrids. Biology. Download this stock image: Powdery mildew on rhododendron (Rhododendron sp.) Photosynthesis is impaired, leaves turn yellow or reddish brown, distort, die and fall off. These newly produced leaves must then replenish the food supply through photosynthesis. In severe cases, the growth of the plant may get stunted. As soon as you notice the black fungus on rhododendron shrubs, check the leaves carefully to determine which insect is responsible and treat it appropriately. You may also notice the affected leaves dropping off. On rhododendrons PM often attacks new growth as well as more mature leaves and stems. Scale – Scale insects commonly cause black fungus on rhododendron. A puzzling aspect of this fungal disease is its varying appearance on different cultivars. On rhododendrons, the disease often fails to develop the distinctive powdery white growth normally associated with powdery mildews. See: Rhododendron-Powdery Mildew. These insects are flat, tan-colored discs on foliage and stems that at first glance appear to be growths on the leaves rather than insects. Powdery Mildew coats the trees leaves blocking the process of photosynthesis which turns light into food for trees and shrubs. 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