A Technical Report from The Bartlett Tree Research Laboratories 168
Powdery mildew is a foliage disease, which occurs on nearly all species of ornamental plants. Rose, dogwood, crape myrtle, lilac, sycamore, catalpa and crabapple are among the species most commonly affected.
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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?