Halo blight Halo blight in mungbean Pseudomonas savastanoi pv. Phaseolicola Early halo blight infection on mungbean leaves have small, water-soaked lesions surrounded by a yellow-green halo Older halo blight lesions start to lose their halo and coalesce together to form larger necrotic spots The underside of leaves infected with halo blight have dark, greasy spots Mungbean pods with halo blight develop small, water-soaked lesions