1. U.S. Department of Agriculture, North East Area, Agricultural Research Service , Beltsville, Maryland, USA
2. U.S. Department of Agriculture, Floral and Nursery Plants Research Unit, U.S. National Arboretum, Agricultural Research Service , Beltsville, Maryland, USA
3. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing, China