Potato leafroll virus (PLRV) can be transmitted permanently to potato plants by only several species of aphids. Myzuz persicae (Sulzer) is well-known to having the highest transmitting capability of PLRV. In order to investigate the PLRV transmission of aphids migrated to highland area in 2018, aphids caught in the yellow water-pan trap were inoculated on the young leaf of indicator plant, Physalis floridana, and inspected by visually and ELISA after 2~4 weeks. As a result, 2.8% of the totally migrated aphids showed virus infected symptom on the indicator plant. PLRV transmission rate of M. persicae and Macrosiphum euphorbiae was 15.4% and 9.1%, respectively. Also, seven aphids out of 265 unidentified aphids showed PLRV symptom in the leaves. PLRV-borne aphids started to fly into the fields from late May, and the virus infection rate was highest of 10.4% in mid-June. M. persicae caught in mid-June showed higher infection rate of 46.7%, but unidentified aphid of 8.3%. Compared with past years, PLRV transmission rate in 2018 has slightly dropped.

• Min Kwon(Highland Agricultural Research Institute, National Institute of Crop Science, Rural Development Administration)
• Juil Kim(Highland Agricultural Research Institute, National Institute of Crop Science, Rural Development Administration)
• Younggyu Lee(Highland Agricultural Research Institute, National Institute of Crop Science, Rural Development Administration)
• Changseok Kim(Highland Agricultural Research Institute, National Institute of Crop Science, Rural Development Administration)
• Seonghui Lee(Highland Agricultural Research Institute, National Institute of Crop Science, Rural Development Administration)
• Eunjoo Hong(Highland Agricultural Research Institute, National Institute of Crop Science, Rural Development Administration)