A Technical Report from The Bartlett Tree Research Laboratories
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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- Our mountain ash tree has white spots on it and the leaves are falling off. Can you help?
- Can you treat powdery mildew on two young dogwoods? I have read that they can be sprayed and will need repeated treatments.
- My jatropa tree has rust and sticky white stuff attached to the leaves and branches. Also, the blooms and leaves are shriveled. What can I do to save this tree?