I have seen the machinery, but not in use. As it was explained to me by the vineyard owner. the harvester straddles the row of grapes, knocks the berries from their clusters, and the berries are collected and moved on conveyor belts.
He made special note to indicate that the netting over the berries is specially sized so that the grapes can be harvested (they fell through the netting) with the harvester, but birds could not get to the crop.
Possibly it is dicarded after harvest.
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