To evaluate the control efficacy of aphid parasitoid Lysiphlebus fabarum( Marshall) against cowpea aphid Aphis craccivora( Koch),biological characteristics of L. fabarum including developmental duration,breeding potential and longevity were measured under laboratory conditions and described,and the life tables of L. fabarum and A. craccivora were established. The net reproduction rate( R0),mean generation time( T),intrinsic rate( rm) and finite rate of increase( λ) were compared and analyzed. The results sh...