Correction to: Oecologia https://dx.doi.org/10.1007/s00442-017-4000-7

Unfortunately, the citation of one of the papers was published erroneously in the original version and corrected here by this Erratum. The original article was corrected.

In the discussion section Paragraph six should read as:

In the current experiments, five pairs of M. pygmaeus were released on the 4th leaf of each plant, and no leaf damage by M. pygmaeus was observed during the experiments, yet these low numbers were sufficient to activate plant defences. In our experiments, M. pygmaeus were released on one leaf, however, in practice, they are free to disperse to other plant parts, and hence more leaves may become exposed to these omnivores, resulting in larger overall effects on herbivore performance. However, pest individuals may actively avoid feeding and reproducing on leaves that were previously exposed to M. pygmaeus. This will be the subject of further research.