The fate of juice grapes and wine grapes differed considerably.
"On most juice grape farms in the southwest, all primary buds are dead. Many growers will probably not have enough grapes to make harvesting economically feasible," the USDA reported April 17.
Michigan farmers harvested 34,900 tons of juice grapes worth $12.7 million in 2010, down from 77,100 tons in 2009. The industry harvested 3,800 tons of wine grapes worth $4.18 million in 2010.
In southwest Michigan, vineyards reported some wine grape damage, but those in the northwest Lower Peninsula escaped harm.
Update on grape crop.