LANCASTER, Pennsylvania — Chris Herr, the executive vice president of PennAg, a Pennsylvania agriculture trade association, said the announcement on Tuesday morning that U.S. dockworkers are striking will have an immediate and devastating impact on farmers everywhere across the country.

“It has the potential to disrupt U.S. grains as well as several other commodity exports at the very time American farmers are looking to sell bumper harvests,” Herr said of the strike in a state whose economy runs on agribusiness.