Answer: Oak leaf blight, also called oak anthracnose, can often exists without notice in a area, then for some reason there will be an outbreak. During these outbreaks large amounts of foliage and twigs can be killed. Frequent spring rainfall and moderate temperatures are conducive to these outbreaks. It is difficult to treat this disease on full grown trees; however, if your tree is a manageable size for spraying, you may want to consider a fungicide application. Contact your local Extension agent for information on pesticides approved for this use in your area. Their number is 815/338-4747.
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