Surveys conducted on the incidence of whiteflies (Bemisia tabaci Gen.) and viral diseases on bitter gourd at Bengaluru, Mandya, Mysuru, Tumkur, Kolar and Chikkaballapur districts of South Karnataka during 2015-16 and 2016-17. In2015-16Kharif, Disease Incidence (DI) ranged from to and Vulnerability Index (VI) to a whitefly population of to per plant in Tumakuru and Mandya districts respectively. In rabi season, disease incidence ranged from to and vulnerability index to with a whitefly population of to per plant in Mysore and Chikkaballapur districts. During 2016-17, in Kharif, disease incidence ranged from to and vulnerability index to with a whitefly population of to per plant in Mysuru and Mandya districts, respectively. In rabi season, disease incidence ranged from to and vulnerability index was to with a whitefly population of to per plant in Mysore and Kolar districts respectively. A positive correlation with disease incidence and whitefly population on bitter gourd was obtained. The activity of whiteflies and the viral disease incidence recorded higher in rabi than in kharif. | Incidence of whiteflies and viral diseases of bittergourd (Momordica charantia L.) in Southern Karnataka, India