In the Mediterranean basinClosterotomus trivialis has been reported as a serious pest of olive and citrus crops. This species has a single annual generation on citrus and overwinters in the egg stage in bark cracks. Females oviposit their eggs at the end of spring. Eggs hatch in late winter to early spring and larvae feed on understorey weeds, mainly on Urtica species and Parietaria officinalis, Urticaceae being the main hosts. The adults feed on buds and young flowers of olives.