Figure 1. Larval survival of two populations of Costelytra zealandica during 12 weeks of feeding treatment with tussock, clover or with a combination of the two plants.

Kaplan Meier plot of survival during the 12 weeks of feeding treatment. Right: final survival after 12 weeks. Population A (dark colored bars) was collected from exotic pastures and population B (light colored bars) was collected from New Zealand native grasslands. All pairwise comparisons were performed using chi-squared tests after 12 weeks of treatment. Only significant differences are indicated on the figure (p < 0.001∗∗∗ and p < 0.01∗∗).