The flight activity of Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) and Teretrius nigrescens Lewis (Coleoptera: Histeridae) in Kenya

► In western Kenya larger grain borer flight activity is high in maize-producing regions. ► The activity of the predatory Teretrius nigrescens is undetectable. ► LGB flight activity is related to relative humidity, temperature and vapour pressure deficit and to previous generations of LGB. ► Greater and more diverse T. nigrescens releases may reduce local extinction of the predator and promote its establishment. ► Climatic models that predict LGB flight activity cannot separate the effect of climatic factors from those of predation by T. nigrescens.