We reported a new white soybean cyst nematode, Heterodera sojae in 2016. This species is closely related to H. glycineswhich has the same host plant. Morphological observations of the cyst, female, male and second-stage juveniles indicatedthat this species is differed from those of H. glycines. Cysts of H. sojae appeared more round, shining and darker thanthat of H. glycines. The distribution of this new cyst nematode in soybean field in Korea is unknown yet. In 2016, 270soil samples were collected from soybean fields and examined the existence of H. glycines and H. sojae. Total of 111samples (41.1%) contained cysts. Among them 77% were H. glycines and 23% were H. sojae. Our results suggest thatextensive researches are required for white soybean cyst nematode.

• Heonil Kang(Department of Plant Bioscience, Pusan National University)
• Namsook Park(Institute of Nematode Research Center, Seoul National University)
• Eulsoo Yun(Institute of Nematode Research Center, Seoul National University)
• Donggeun Kim(Institute of Nematode Research Center, Seoul National University)
• Insoo Choi(Department of Plant Bioscience, Pusan National University, Institute of Nematode Research Center, Seoul National University)