Mock orange bush has black bugs on the end of branches
You didn't say whether the foliage has damage from black bugs eating it. You really should know what the bugs are doing--or get an identification from your local horticultural extension service. If this is a plant-eating insect, I would first try hosing them off the bush with a fine hard spray from the hose. If that doesn't work, I would spray with an insecticidal soap or ultrafine horticultural oil--that should solve the problem.
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