A field experiment was conducted at Agricultural Research Station, Kalaburagi, University of AgriculturalSciences, Raichur during kharif 2015 to evaluate the effect of pre and post emergent herbicides on weeds and productivityof blackgram [Vigna mungo (L.) Heppler] under rainfed conditions. Fifteen treatments were tested in randomized blockdesign with three replications. Among the weed control treatments, pendimethalin 30 EC @ 0.75 kg a.i ha-1 fb imazethapyr10 SL @ 75 g a.i ha-1 at 20 DAS recorded significantly lower total weed density (2.19/0.25 m2), weed dry weight(1.38 g/0.25 m-2) and weed control efficiency (92.1%) than rest of the treatments including weedy check but it was on parwith that of pendimethalin 30 EC @ 0.75 kg a.i ha-1 fb quizalofop ethyl 5 EC @ 75 g a.i ha-1 at 20 DAS, intercultivation at20 and 40 DAS, tank mix application of imazethapyr 10 SL and quizalofop ethyl 5 EC each @ 75 g a.i ha-1 at 20 DAS andpendimethalin 30 EC @ 0.75 kg a.i ha-1 fb one hand weeding at 25-30 DAS as compared to weedy check. The sametreatments also noticed significantly maximum growth and yield attributing characters.