Answer: I don't have a concrete answer for you. Silver maples and other large trees are best pruned in the late winter or early spring. Maples have a tendency to "bleed" sap when cut at this time. While it is not a health concern for the trees, it can make a mess as it pours down onto the the trunk - and it can stain the trunk. Another concern is that pruning cuts this late in the season will not have a chance to heal properly before cold weather sets in. I'd save the job for early next spring.
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