Constellation Brands, the maker of Modelo and Corona beer, announced a $100 million investment over five years aimed at supporting barley growers across Montana, Idaho, and North Dakota, addressing mounting cost pressures that have shrunk the region's acreage devoted to the crop. Barley serves as a primary ingredient in Constellation's flagship products. The company's commitment targets a sector facing headwinds from elevated input costs, volatile weather, and shifting farm economics. Montana's barley acreage has contracted sharply, falling from more than two million acres historically to around 800,000 acres today, according to industry figures. Farmer Perspective on Support Lee Dahlman, a fourth-generation barley farmer in Montana whose great-grandfather homesteaded the operation more than a century ago, serves on the Montana Wheat…