Parasitism interacts with mutual interference to limit foraging efficiency in larvae of Nephus includens (Coleoptera: Coccinellidae)

► The effect of parasitism and predator-prey density on predator efficiency examined. ► Predation by predator larvae influenced by parasitism and mutual interference. ► The effect of parasitism and mutual interference declined as prey density increased. ► The invading predators may have higher impacts when they escape from parasitism. ► Carefully timed release of parasitism immuned-stages could maximize their control.