Figure 6. Host switches did not affect larval performance.Larvae were reared on Urtica , Salix or Ribes and moved to a new host plant when reaching the 5th instar (n=9-10 per treatment). To measure larval performance the daily growth rate was calculated as log(mass in µg)/developmental time. No significant differences in the growth rate were found between the different treatments. The average age of larvae when they reached the 5th instar and were, thus, switched to a new host is indicated by the vertical line. 95% confidence interval is shown as shading for the smoothed curves. The letters on top of each panel represent the plants involved in the host switch. The first letter pair corresponds to Host 1, the second letter pair to Host 2. Ud=Urtica dioica , Sc=Salix caprea , Ru=Ribes uva-crispa .