The aphid Schizaphis graminum (Rondani) (Hemiptera: Aphididae) is one of the main pests of sorghum crop. The objective of this work was to evaluate the effect of this aphid feeding on resistant and susceptible sorghum genotypes on the development of its predator Cycloneda sanguinea (Linnaeus) (Coleoptera: Coccinellidae). The aphid was reared on leaves of sorghum genotypes GR 11111 and TX 430 x GR 111, resistant, GB 3B, moderately resistant, and BR 007B, susceptible to the hemipterous. Larvae of C. sanguinea were fed ad libitum on S. graminum nymphs and adults, daily. The duration and survival of developmental phases of C. sanguinea were not significantly influenced by genotype. Only the fourth instar, the larval phase and the larvaeadult period duration were affected. The weight of C. sanguinea larvae of second instar was not affected by sorghum genotype. For both instars and adult phase, this parameter was differentiate due to each genotype used as host to the aphid. The resistant genotypes GR 11111 and TX 430 x GR 111 do not affect adversely C. sanguinea development and fecundity, during one generation. These genotypes show compatibility with the predator, allowing the S. graminum management on sorghum crop.
larvae; developmental stages; host plants; pest resistance; biological control
