Department of Plant Pathology, University of California, Riverside, CA 92521, USA.|Department of Plant Pathology, University of California, Riverside, CA 92521, USA.|Department of Plant Pathology, University of California, Riverside, CA 92521, USA.|Department of Plant Pathology, University of California, Riverside, CA 92521, USA.|Department of Plant Pathology, University of California, Riverside, CA 92521, USA.