Figure 2. Cumulative weight gain of two populations of Costelytra zealandica larvae following 12 weeks of artificial host-shift feeding treatment, where larvae were fed for 7 weeks on tussock and 5 weeks on clover.

Population A (dark grey line) (n = 17) was collected from exotic pastures and population B (light grey line) (n = 24) from New Zealand native grasslands. Vertical bars represent 5% LSDs (Least Significant Difference) at the end of each week of treatment.