Department of Entomology, China Agricultural University, Beijing 100193, P.R.China;
Haidian District Center for Disease Prevention and Control, Beijing 100094, P.R.China;
Department of Entomology, China Agricultural University, Beijing 100193, P.R.China;
Department of Entomology, China Agricultural University, Beijing 100193, P.R.China;
Department of Entomology, China Agricultural University, Beijing 100193, P.R.China;
Department of Entomology, China Agricultural University, Beijing 100193, P.R.China;
Beijing Center for Disease Prevention and Control, Beijing 100013, P.R.China;