Grape cane girdler . In late May-June, this shiny black beetle lays its eggs in a green shoot. The female then proceeds to girdle the cane just above the egg and just below the egg. This section of shoot either dies back or breaks off. A shoot which all of a sudden snaps, perhaps hanging by a thread, has been attacked by the cane girdler.
Damage is usually minor.
Grape tumid gallmaker . A small fly by this name lays its egg within an unfolding bud or shoot tip. Maggot-like larvae hatch and feed on vine tissue. Galls can be found on leaf undersides, clusters, and petioles. Although vineyards in New England have reported serious infestations of this pest, it has not been a problem on Long Island.