London plane trees are losing their leaves prematurely and after a close look they have powdery mildew and a leafspot that produces circular non-descript brown spots on the leaves. The spots are numerous and both diseases are contributing to early defoliation. The fungus leafspot is Phyllosticta leafspot and is typically a weakly pathogenic fungus but the cool, wet weather has been ideal and with the trees senescing anyway, the fungus has been very aggressive. Fortunately, it will not cause a decline in overall tree health at this point in the season but is making the trees appear untidy. No fungicide sprays are recommended for this disease at this time.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWx40EyCJ7whmuOtWGYLFv3uirPu0XHP9eauBuyHs23d7aeAVB1FpTK6OxHLWGHcuGWNW3hx8j8xkpZyvslYFmZHmMD-JKx8A9xr0sFBgOkHsHTERM0UaV_GB_coE7s1So5KTQQ-WfLTs/s400/london+plane+trees.jpg)
Information from Bob Mulrooney, Extension Plant Pathologist, UD.
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