[1] USDA ARS,BELTSVILLE AGR RES CTR,INST PLANT PROTECT,MICROBIOL & PLANT PATHOL LAB,BELTSVILLE,MD 20705
[2] UNIV MARYLAND,DEPT BOT,COLLEGE PK,MD 20742
[3] USDA ARS,BELTSVILLE AGR RES CTR,INST PLANT GERMPLASM & GENET,GERMPLASM QUAL & ENHANCEMENT LAB,BELTSVILLE,MD 20705