Dan D’Ambrosio USA TODAY June 26, 2013 WATERBURY, VT. -- Ricardo Puente is a worried man. Coffee drinkers may soon have reason to join him. Puente, president of Apecafe in El Salvador, a cooperative of more than 400 coffee farmers, has been watching closely as "la roya," a fungus, has devastated coffee plantations across Central America this year. "We think outbreaks of violence and famine can occur in some cooperatives as a result of this situation," Puente said in a recent interview from San Salvador, where Apecafe is headquartered. The price of coffee has yet to go up in the United States as a result of the fungus, also known as coffee rust disease. But Lindsey Bolger, senior director of coffee for Green Mountain Coffee Roasters here, said that could change next year. "The consumer should be worried about the long-term implications of rust because it could severely limit the depth and breadth of coffee they love," Bolger s...