Q: Big hackberry tree in backyard shades our deck; we tolerate leaf drop. This fall deck was covered with sticky, saplike substance turning a green umbrella black. Also on nearby plant leaves.
You likely have aphids in the tree. Aphids suck sap and secrete sticky honeydew. Honeydew coats everything below and feeds sooty mold fungus. Hard to control organically but natural predators (lady beetles, yellowjackets, wasps) usually do a good job. If mold bothers you, consider systemic insecticidal drench to tree roots next spring.
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