Chiang Mai Journal of Science

     Powdery mildew (PM), caused by the fungus Oidium sp., is a destructive foliar disease affecting mungbean (Vigna radiata), leading to significant yield losses. This study evaluated powdery mildew severity in twenty mungbean genotypes and identified SSR alleles associated with resistance. Disease severity was assessed using the area under the disease progress curve (AUDPC). Results showed eight resistant genotypes: 500167, LM 19, MN 98, V2540, V2564, VC1210A, and VC6468-11-1A, exhibiting significantly lower AUDPC values than susceptible genotypes (P<0.05). Single marker analysis using chi-square tests identified two SSR alleles significantly associated with resistance: B1 of CEDG166 and C1 of MB-SSR238. CEDG166 alone explained 42% of the phenotype variance, and the combination with MB-SSR238 increased the explanatory power to 55%. These markers may be useful in marker-assisted selection (MAS) to develop resistant mungbean varieties. The findings contribute to sustainable disease management strategies and breeding programs for powdery mildew-resistant mungbean.