The green/orange ball-like growths on maple leaves in northern Ohio are galls caused by mites, midges, or aphids injecting eggs/hormones in early spring. Some leaves show black holes or early drop.
Galls are unsightly but do not significantly harm the tree. Once formed, they cannot be removed by sprays. The tree may experience minor stress.
Apply organic matter (compost tea, leaf litter, humic acids) to support overall health. Fertilize appropriately. Accept galls as a natural curiosity; they rarely warrant intervention.
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