Abstract: 【Objective】To evaluate the prevention and control efficacy of Atailing against potato mosaic virus disease and to provide a reference for its application in potato production.【Methods】Field experiments were conducted during 2023—2024 in Qahar Youyi Front Banner（Ulanqab,Inner Mongolia） and Wuchuan County（Hohhot,Inner Mongolia） using a randomized block design. Four concentration gradient treatments of Atailing solutions（800-fold,1 000-fold,1 300-fold,and 1 500-fold dilutions） were tested,with water spray as the control（CK）. The first application was carried out when potato seedlings reached 10-15 cm in height,followed by spraying once every 7-10 d,with a total of 3 applications. The prevention and control efficacy of Atailing against potato mosaic virus disease was then analyzed.【Results】Spraying Atailing was safe for potato plant growth. The 800-fold and 1 000-fold dilutions significantly reduced the incidence rate and disease index of potato mosaic virus disease（P<0.05）,showing stable and superior control efficacy. The control efficacy of 800-fold dilution of Atailing on potato mosaic virus disease reached 81.8%-84.7%,with a yield of 31 788.0-36 693.0 kg/hm²;the control efficacy of 1 000-fold dilution of Atailing on potato mosaic virus disease reached 80.0%-81.7%,with a yield of 31 034.3-33 963.8 kg/hm².【Conclusion】Application of Atailing at 800-fold or 1 000-fold dilutions when potato seedlings are 10-15 cm in height can significantly reduce the incidence of potato mosaic virus disease and effectively improve potato yield.

Key words: Atailing, Potato mosaic virus disease, Prevention and control efficacy