Napa, Calif.—Every farmer knows of the importance of honeybees in fertilizing plants. Now researchers at the University of California, Davis, and Los Alamos National Laboratories find they also may help provide an early warning of powdery mildew. They’re hoping this research will help them eventually develop a “smart nose” that can warn of the fungus and help both to destroy it in vineyards and reduce unneeded application of fungicides.