The 27-year-old Lodhgar, playing only his second Ranji match, had returned career best figures of 6/28 on the second day, and finished with an enviable tally of 11 wickets fromthe match at the Jadavpore University campus, Salt Lake.
Bengal gleaned four points to begin their Ranji campaign in style, while Karnataka could not open their account.
Karnataka were done in by an inept display from their batsmen who failed to negotiate the guiles of Lodhgar (5/89) and right arm off spinner Sourasish Lahiri (3/46) on a turningtrack and folded up for 226 in the second innings.
Set a target of 343 for an outright win, the visitors resumed at the overnight score of 41/1, and soon found themselves in trouble at 113/5, before Vijay Bharadwaj (40;142 m, 103 b, 4x4) and an aggressive Stewart Binny (42; 51m, 40b, 4x6 and 6x1) tried to put up a fightback with a 58 run stand for the sixth wicket.
After Binny was ousted by pacer Ranadeb Bose, the gritty Bhardwaj and veteran Sunil Joshi (15) delayed the inevitable with a seventh wicket partnership of 40, but the tail felllike a heap soon after as the Karnataka innings folded 20 minutes prior to the tea break.
Brief score : Bengal 315 and 206. Karnataka : 179 and 226 (S Somasunder 46, S Binny 42, V Bhardwaj 40; M Lodhgar 5/89, S Lahiri 3/46).