1. Key Laboratory of Biohazard Monitoring, Green Prevention and Control for Artificial Grassland, Ministry of Agriculture and Rural Affairs, Institute of Grassland Research of Chinese Academy of Agricultural Sciences, Hohhot 010010, China
2. Inner Mongolia Autonomous Region Forestry and Grassland Pest Prevention and Quarantine Station, Hohhot 010051, China
3. School of Food and Agriculture, University of Maine, Orono, ME 04469, U.S.A.