Alternaria spp.was detected on rapeseed siliques with black mold collected from Liling city of Hu-nan Province under microscope in 2012.Among 36 tested commercial rapeseed cultivars,Huaxiangyou 12 had the highest Alternaria contamination frequency (up to 5 1%)by microscope on seed detection.Isolates were proved to be A.brassicicola and A.brassicae respectively by rDNA-ITS sequence analysis.Huaxiangyou 12 had the highest i-solation rate (66%)and only carried A.brassicicola.Changyouza 6 1 had the highest A.brassicae isolation frequen-cy (15%).No A....