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Powdery Mildew Technical Report

Powdery mildew is a foliage disease, which occurs on virtually all species of ornamental plants. Rose, oak, hawthorn, lilac, sycamore, laurel, and crabapple are commonly affected. Heavy infection can cause premature defoliation, growth reduction and render the host aesthetically unpleasing. Powdery mildew may occur at any time during the growing season; however, it is usually most severe in the late summer months. Unlike most foliage diseases, powdery mildew is inhibited by extremely wet weather.

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Featured Tip

Trees under stress display key symptoms indicating that a serious problem may exist or could develop if ignored. Learn about the warning signs that may denote trouble with your trees.

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