1. Department of Biological Sciences; University of Wisconsin; Milwaukee WI 53211 USA
2. State Key Laboratory for Biology of Plant Diseases and Insect Pests; Institute of Plant Protection; Chinese Academy of Agricultural Sciences; Beijing 100193 China
3. Department of Physics; University of Wisconsin; Milwaukee WI 53211 USA
4. Department of Microbiology and Molecular Genetics; Michigan State University; East Lansing MI 48824 USA
5. Department of Plant, Soil, and Microbial Sciences; Michigan State University; East Lansing MI 48824 USA