This dataset was produced over a 2-year field experiment conducted near Angers (France). The aim was to investigate the effects of intercropping chickpea with a mowed service plant to control both weeds and ascochyta blight, while mitigating interspecific competition to minimise yield reductions. Two factors were tested in this experiment: i) the species of service plant intercropped with chickpea (sole chickpea, Egyptian clover, faba bean, oat, Sudan grass), and ii) whether or not to mow the inter-rows of chickpea (no mowing, one mowing at the beginning of chickpea flowering). The experimental layout and the protocol are detailed in Guy et al. (2025).