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I live in southern Nevada andI live in southern Nevada and have a nine year old Thompson Seedless grape vine that annually produces about 3 lbs of grapes. About mid-July through the end of August, I notice small flying insects about the size of aphids that enjoy sucking the juices from the leaves. I believe they're "leaf hoppers". I've tried spraying the leaves with a dish detergent/water mix, and someone suggested adding some vinegar to that spray. They don't attack the fruit, just the leaves. How do I get rid of them?

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