(BusinessWeek) - Bulk wine prices in France, Italy and Spain, the world’s largest producers, are climbing after adverse summer weather reduced the European grape harvest, according to wine broker Ciatti Co. Italian pinot grigio from the 2012 vintage has increased to 1.30 to 1.45 euros ($1.69-$1.88) a liter (0.26 gallon) from 1.20 to 1.30 euros last month, San Rafael, California-based Ciatti, which says it’s the world’s largest broker of bulk wines, wrote in an e-mailed report.