Rotylenchus pini Mamiya, 1968 was reported from rhizospheric soils of Zoysia japonica in Korea. Females and males of the characterized population conform to the original species description from Japan and also to other subsequent species descriptions with variations in a few details in morphometrics including the existence of pharyngeal gland overlap in some specimen. Bayesian analysis of all the three DNA markers consistently grouped R. pini together with Rotylenchus species including R. zhongshanensis, a morphologically close species. Additionally, the newly obtained sequences of R. pini were found to be almost identical to the sequences assigned to Rotylenchus aff. devonensis in GenBank. These Rotylenchus aff. devonensis isolates might be representatives of R. pini populations. The current and previous phylogenetic studies supported by the recorded morphological plasticity within populations of the genus validate the proposed synonymy of Pararotylenchus with Rotylenchus.

Soybean cyst nematode, Heterodera glycines is one of the major plant parasitic nematodes in soybean. Recently, another soybean cyst nematode, H. sojae was recorded from Korea. This study was conducted to determine the geographical distribution of the two soybean cyst nematodes in Gangwon-do and Chungcheongbuk-do, Korea. In Gangwon-do, H. glycines and H. sojae were detected in 12 and 5 of the 53 sites sampled, respectively, while in Chungcheongbuk-do, H. glycines was isolated from 14 of the 46 sites sampled. H. sojae was detected at only one site. Additionally, the two soybean cyst nematodes co-existed in 3 of the 46 sites.