Pseudococcus longispinus, a notorious cosmopolitan pest species of mealybugs, known to be distributed indoors in Korea since 2002, is found to be mixed with another species, Pseudococcus orchidicola. Finding P. orchidicola as a pest of tropical plants in Korea is rather unexpected because of their main distribution in Pacific area and South Asia. However, all the available information from morphology, molecule and advices on identification from mealybug specialists indicated this is best matching P. orchidicola. Morphological, molecular and some biological notes on P. orchidicola are provided with some adult and nymphal images, and compared with P. longispinus. A full discussion mainly on identity and distribution of P. orchidicola is given.

• Hyun-Na Koo(Department of Plant Medicine, Chungbuk National University)
• Seulki Kim(Department of Plant Medicine, Chungbuk National University)
• Jae Seon Lee(Department of Plant Medicine, Chungbuk National University)
• Won Jin Kang(Department of Plant Medicine, Chungbuk National University)
• Woo Seong Cho(Department of Plant Medicine, Chungbuk National University)
• YeJin Kyung(Department of Plant Medicine, Chungbuk National University)
• Jin-Won Seo(Department of Plant Medicine, Chungbuk National University)
• HyunKyung Kim(Department of Plant Medicine, Chungbuk National University)
• Gil-Hah Kim(Department of Plant Medicine, Chungbuk National University)
• Soowon Cho(Department of Plant Medicine, Chungbuk National University)