Figure 4.

Plant genotype resistance to herbivory by D. carinulata in the pellet bioassay (A). Resistance is defined as 1-proportion of pellet damage. Pellets made from plants with high levels of T. ramosissima introgression had greater resistance (resistance = 0.919–0.002*introgression; F_1,28.9 = 15.2, P < 0.001; R² = 0.42). Some resistance values were >1 in some cases because the treatment pellet weighed slightly more than the control pellet and it was not consumed. Percent change in larvae mass in the pellet bioassay (B). Plant species introgression had a negative effect on larval performance (%change in larval mass = 0.15*introgression – 15.2; F_1,27.8 = 8.0, P < 0.01; R² = 0.29).