Leftover wine to become biofuel as EU moves to cut excess production.
If Boel's proposal passes, producers would be encouraged to grow fewer grapes and stick to making high-quality wine.
"Over a five-year period uncompetitive producers would step out," Mann said.
The move is expected to meet resistance, however; wine-making is a major economic and emotional issue in Europe.
200m litres of wine and alcohol from wine by-products will be disposed this year alone.