Mazatlan, Mexico

At a Glance Researchers have dubbed the affliction "Rapid Apple Decline."Apples are a $4 billion industry in the United States.Some say extreme climate could be to blame. Something is killing America’s apple trees, and researchers are scrambling to get to the root of the problem before it spreads across the country’s $4 billion industry. Scientists and growers alike are stumped by Rapid Apple Decline (RAD), sometimes also called Sudden Apple Decline, an overarching term dubbed by the Pennsylvania Department of...