Wash off the aphids with the strong spray from your hose every two to three days to minimize their damage until harvest time. They are typically located on the undersides of the leaves. The translucent, soft-bodied insects will fall to the ground where they won't recover. Do this in the morning so the leaves have time to dry before nightfall.
Increase the population of lady bugs, which can be purchased online and in some nursery and garden centers. Ladybugs eat aphids and can help control their population.
Treat the okra with an insecticide that is safe for okra plants and effective in controlling aphids. Imidacloprid, azadirachtin, flonicamid and malathion are examples of insecticides that can be used to treat aphids. Read the label and apply per manufacturer directions for safe and effective use.