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Three essential oils extracted from German chamomile, Matricaria chamomilla, Anise, Pimpinella anisum and cumin, Cuminum cyminum were assessed against two of the major stored grain insect species, Sitophilus oryzae (L.) and Tribolium castaneum (Herbst). The chemical composition of the essential oils was determined by gas chromatography (GC) and GC/mass spectrometry. The bioactivity of the oils determined was assessed against both species. A concentration of 1 ppm, essential oils caused 100% mortality of S.oryzae after 96 h. of exposure, whereas, T. castaneum were more tolerant to the oils than S. oryzae. At this concentration, the values of F1 progeny production, progeny reduction (%) and grain weight loss (%) of both insect species were lower than other concentrations. Eventually, all oils exhibited a negative impact on some biological aspects of both insects. These results highlight the potential of these oils as grain protectants and antifeedants, and consequently could be suitable for the management of insect pests in grain stores.

Chemical Composition and Bioactivity of Three Plant Essential Oils against Tribolium castaneum (Herbst) and Sitophilus oryzae (L.)