Volatile compounds in the headspace of flowers of Sinapis alba subjected to herbivory to vegetative parts.

Undamaged (UD), subjected to damage by the aphids Lipaphis erysimi, Myzus persicae or Plutella xylostella caterpillars, 48–72 hours and 72–96 hours after the start of damage. Means (± standard error). Compounds are in order of elution on an HP-1 GC column.1Mean (± s.e.) from five replicates (see Methods). Trace indicates compound was detected in a single sample. (-) indicates that the compound was not detected in any sample.