Bioefficacy of different populations of Steinernema carpocapsae was studied against Meloidogyne incognita in laboratory condition as well as in pot condition. The mean percent mortality of M. incognita second stage juveniles were recorded after every 6 hrs intervals upto 72 hrs at different inoculum levels viz., 5, 10, 15 and 20 IJs of EPNs per cavity block in laboratory condition. Maximum (20.62) mean per cent mortality was observed with S. carpocapsae STSLU@ 20 IJs per cavity block after 72 hrs. Bioefficacy of the S. carpocapsae against M. incognita was also studied in pot condition. Maximum (37.79 cm) shoot length, (30.00 g) shoot weight, (31.79 cm) root length, (12.61g) root weight and minimum (22.83) galls per plant, (10.69) eggmasses per plant, (232) eggs and larvae per eggmass and (507.38) larvae per 200 cc soil were recorded with S. carpocapsae STSLU @ 20,000 over all other treatments.