Theodor O. Diener, a Swiss-born scientist whose investigation more than half a century ago of shriveled, stunted potatoes yielded the discovery of the tiniest known agent of infectious disease, a ...

Florida avocados, a signature staple in kitchens, a favored fruit tree in landscapes and a source of pride for the state's growers, are facing a renewed threat from avocado sunblotch viroid (ASBVd).