The Bemisia tabaci (Hemiptera: Aleyrodidae) is a pest that sucks a plant's phloem, excretes nectar and infects tomatoes with TYLCV (Tomato Yellow Leaf Curl Virus), causing severe economic damage. In order to explore the cause for occurrence of areas where the genetic structure of B. tabaci MED (Mediterranean) was reversed in a short period of time, this study was conducted. We collected and analyzed the B. tabaci MED populations from tomato greenhouses in some areas where their genetic structure was reversed between two years 2016 and 2017. As a result, the genetic structure of B. tabaci MED populations was found to be close between populations of the nursery and the greenhouses where tomato seedlings were supplied from that nursery, even if greenhouses were located far away each other. Further study is needed to identify the causes for occurrence of abrupt reverse of genetic structures of B. tabaci MED populations observed in some areas throughout the country.

• Yujeong Park(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Hwa Yeun Nam(Entomology program, Department of Agricultural Biotechnology, Seoul National University)
• Joon-Ho Lee(Entomology program, Department of Agricultural Biotechnology, Seoul National University, Research Institute of Agriculture and Life Sciences, Seoul National University)