Drought-stricken California farmers facing drastic cutbacks in irrigation water are expected to idle some 500,000 acres of cropland this year in a record production loss that could cause billions of dollars in economic damage, industry officials said. Large-scale crop losses in California, the No. 1 U.S. farm state producing half the nation's fruits and vegetables, would undoubtedly lead to higher consumer prices, especially for tree and vine produce grown only there. But experts say it is too soon to quantify the effect. Coming off its driest year on record, California is gripped in a drought that threatens to inflict the worst water crisis in state history, prompting Governor Jerry Brown last month to declare a state of emergency. "We're in a dire situation that we've never been in before," said Paul Wenger, president of the California Farm Bureau Federation.