Plants are challenged by above- and below-ground herbivores at the same time. It has been well documented that herbivore damage may elicit local as well as systemic induced plant responses. These responses are governed by hormonal signalling pathways such as the jasmonic and salicylic acid pathways. Cross-talk between signalling pathways determines the specificity of the response to the herbivore attacking the plant, which is thought to be a major benefits of induced over constitutive defences. When two herbivores are feeding, the signalling pathways induced by either herbivore may interact. In this way, above- and below-ground herbivores may affect each other’s performance thus fine-tuning of the plant’s response either herbivore may be compromised. Here I present our recent research on how root herbivores may affect aboveground herbivores via induced plant defences. Using Brassica species and various root and shoot feeding herbivores as a model system, I will illustrate the genetic and chemical mechanisms behind these interactions. Moreover, I will show how root herbivory affects the performance of shoot herbivores in a species-depending fashion. In the end, I will discuss the ecological implications of our findings for the integrative defence strategies.