(Reuters) - Bordeaux vineyards in southwest France could lose about half of their harvest this year after two nights of frost damaged the crop at the end of April, a wine industry official said on Saturday.

Wines from the Cognac, Bergerac, and Lot-et-Garonne regions had also been affected, Bernard Farges, head of the Syndicat des vins Bordeaux et Bordeaux Supérieur, told Reuters.

"For Bordeaux wines...we estimate that the impact will be a loss of about 50 percent, depend on how many buds can regrow," he said.

Including lost earnings at wine industry subcontrators, the total damage is estimated at one to two billion euros ($1.1- $2.2 billion), with wine production set to fall by about 350 million bottles.