Lots and Lots of Vaseline. Just cover every grape in about 15 ounces of Vaseline. When its just about completely enveloped in the goopy formation let it sit in the Sun for about 3 hours. That should make it unpenetrable to a bug of any size or origin.
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prune all unhealthy diseased or dead branches off cleanly and smoothly with pruners or shears. DO NOT USE
get rid of the aphids and the ants will leave. also try and placing some glue on the trunk
The easiest way is to rub off any flowering shoots. This is often done to reduce the number of flowers. This provides more nutrients to any flowers left to produce grapes.