Answer: Ash trees can develop fungal leaf spots, especially in wet, rainy spring weather. The fungus that causes this problem can remain on the bark, twigs and stems and reinfect the tree in subsequent years. The best way to control the problem is to rake and destroy fallen leaves at the end of the season. If the disease was severe the previous year, a fungicide can be sprayed twice at 10 day intervals beginning when the buds start to open in the spring.
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