[1] USDA, CSREES, Natl Res Inst, Washington, DC 20024 USA
[2] Univ Calif Riverside, Dept Plant Pathol, Riverside, CA 92521 USA
[3] ARS, Immunol & Dis Resistance Lab, ANRI, USDA, Beltsville, MD 20705 USA
[4] Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA
[5] Univ Minnesota, Biol Proc Technol Inst, St Paul, MN 55108 USA