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Background  The demographic parameters of the predacious seven spotted ladybird beetle  Coccinella septempunctata  Linnaeus (Coleoptera: Coccinellidae) reared on the following four host aphid species were compared:  Rhopalosiphum padi  Linnaeus (Hemiptera: Aphididae),  Rhopalosiphum maidis  Fitch (Hemiptera: Aphididae),  Sitobion avenae  Fabricius (Hemiptera: Aphididae), and  Schizaphis graminum  Rondani (Hemiptera: Aphididae).    Methods  The developmental period, fecundity, adult preoviposition period, total preoviposition period and population parameters were evaluated based on the two-sex age-stage life table. The duration of the developmental stages and the population parameters were calculated with the TWOSEX-MSChart program, whereas population size was projected based on the two-sex age-stage life table data with the TIMING-MSChart program.    Results  The intrinsic rate of increase ( r ) was the highest in the  R. padi  predators (0.1946 per day), followed by the  S. graminum  (0.1435 per day),  S. avenae  (0.1400 per day), and  R. maidis  (0.1180 per day) predators. The differences in the net reproductive rate ( R  0 ) and the finite rate of increase ( λ ) when  C. septempunctata  was reared on the four aphid species were consistent with the  r  values. This trend was reversed for the mean generation time ( T ), which ranged from 29.02 days for the lady beetles reared on  R. padi  to 39.75 days for the lady beetles reared on  R. maidis . Interestingly,  R. padi  was the most suitable host, while the congeneric  R. maidis  was the least suitable. The results of this study may be useful for future investigations regarding the ecological effects of predatory species and the mass-production of  C. septempunctata  in the laboratory for an augmentative release of an aphid predator.

Comparative analysis of the demographic parameters of seven spotted ladybird beetle (Coleoptera: Coccinellidae) reared on various host aphid species