Figure 2

Partial Least Squares – Discriminant Analysis (PLS-DA) based on plant volatile emissions after 24 h of feeding by Plutella xylostella with cross validation based on 50 submodels (fivefold outer loop and fourfold inner loop). Pairwise tests were performed, based on PLS-DA with 999 permutations, to highlight the difference between treatments with n = 9 to 12. * P < 0.05.