Aphelenchoides composticola is an economic pest in mushroom cultivation, with a potential to cause heavy losses in the commercial production of Agaricus spp. Recently, A. composticola was intercepted on cultivated mushrooms in Korea and herein, this newly recorded species is morphologically and morphometrically characterized, and symptoms of mushroom damage are equally illustrated. The offset head, a prominent muscular median bulb, oval to round in shape, lateral field with three incisures, tapering truncate tail and average body length of 612.8μm, characterize females. Males are slightly smaller (561.2μm), characterized by well-developed paired spicules, ventrally curved tail, and conoid tail terminus posed with a terminal mucro.

• Mwamula Abraham Okki(Department of Ecological Science, Kyungpook National University, Sangju, Republic of Korea)
• DongWoon Lee(Department of Ecological Science, Kyungpook National University, Sangju, Republic of Korea)
• Hyeong Hwan Kim(Horticultural and Herbal Crop Environment Dividion, National Institute of Horticultural and Herval Science, RDA)
• Jung Beon Yoon(Horticultural and Herbal Crop Environment Dividion, National Institute of Horticultural and Herval Science, RDA)