Figure 1.

Maize inbred line Mp708 provides enhanced antibiotic- and antixenotic-mediated resistance to CLA. A, Total number of CLA adults and nymphs recovered (antibiosis; no-choice assay) 7 d after infestation of V3 maize plants (defined in Ritchie et al., 1993) with five adult apterous aphids per plant (n = 12). B, In the choice test to determine antixenosis, 15 adult CLA were released at the center of a pot containing one plant of each indicated maize line. The number of adult aphids that settled on each plant was counted after 24 h (n = 10). For both A and B, values are the mean ± se of aphid numbers on a minimum of 12 plants of each genotype for no-choice assay (n = 12) and 10 plants of each genotype for choice assay (n = 10). Aphid bioassays were repeated two times with similar results with at least eight plants per genotype. Different letters or asterisks above the bars indicate values that are significantly different from each other (P < 0.05).