The genus Aphidius is one of the largest groups of aphid parasitoids. Aphidius colemani is most common and commercially available for the aphid control. Recently, the mummies of Rhopalosiphum padi were collected from barley banker plants in Yecheon. Nucleotide sequence analysis identified its parasitoid as A. transcaspicus, which is morphologically similar to A. colemani. Interspecific variation of both COI and ITS2 between two species was 5.13 and 10.73%, respectively. Intraspecific variations of both COI and ITS2 of A. transcaspicus was 1.85 and 4.96%, respectively. We assume the barley banker plants for A. colemani were contaminated by A. transcaspicus. Thus, precise identification of natural enemies is required for more effective pest control.

• Hwal-Su Hwang(Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea)
• Duck-Oung Jung(Sustainable Agriculture Research Center, Kyungpook National university, Gunwi, Republic of Korea)
• Jin-Won Kim(Yecheon Agricultural Technology Center, Yecheon, Republic of Korea)
• Kyeong-Yeoll Lee(Department of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea, Sustainable Agriculture Research Center, Kyungpook National university, Gunwi, Republic of Korea)