Foraging Activities of Apis mellifera L. and Bombus terrestris L. on Pear Trees in Full Blossom

Lee, Sang-Beom (Department of Agricultural Biology, National Institute of University, Agricultural Science and Technology, RDA) ;
Seo, D.G. (Farm Management Office, Farm Management and Information Office, RDA) ;
Kim, Y.S. (Department of Agricultural Biology, National Institute of University, Agricultural Science and Technology, RDA) ;
Kwak, N.I. (Cheonan-si Agri. Techno. Center, Chungcheongnam-do ARES, RDA) ;
Park, H.C. (Department of Agricultural Biology, National Institute of University, Agricultural Science and Technology, RDA) ;
Yoon, H.J. (Department of Agricultural Biology, National Institute of University, Agricultural Science and Technology, RDA) ;
Kim, W.T. (Department of Agricultural Biology, National Institute of University, Agricultural Science and Technology, RDA)