Volatile compounds detected in the headspace of Brassica oleracea, uninfested (control), or infested with two caterpillars of Pieris rapae that were either unparasitized or parasitized with Cotesia rubecula or C. glomerata.

Only those compounds have been included that were present in all replicates of at least one treatment. Amounts of individual compounds are given as average peak area (SE) per litre of trapped air per gram shoot biomass. Variable Importance in the Projection (VIP) scores for the PLS-DA are given. Bold face type scores are higher than 1 and are most influential for separation of the treatments. Differences among treatments for compounds with VIP score >1 based on Mann–Whitney U pair wise comparisons are indicated with superscript letters.*(E)-DMNT = (E)-4,8-dimethylnona-1,3,7-triene.