A New Host of Citrus Nematode, Tylenchulus semipenetrans Cobb, in Korea

During the course of study on plant parasitic nematodes associated with medicinal herbs on Korea, high population of different stages of citrus nematids, Tylenchulus semipenetrans was found in association with pyrola japonia Klenze in Imsil, Chunbuk province. The second stage larvae and males were isolated from rhizosphere soil; ummature and mature females were detached from the roots of infested plants of Pyrola japonica. Besides cirtus it has been reported to parasitize on roots of Syringa vulgaris, Diospyros lotus, olive, grapevine, and pear in different parts of the world. This is the first record of T. semipenetrans parasitized on a medicinal plant, Pyrola japonica.