Tan spot Tan spot in mungbean Curtobacterium flaccumfaciens pv. Flaccumfaciens Mungbean seedlings with tan spot have chlorotic lesions and often wilt and die Tan spot lesions are tan in colour with a bright yellow margin Tan spot lesions often start on the edge of mungbean leaves Tan spot causes interveinal leaf necrosis in mungbean leaves Tan spot can result in flower abortion