الفهرس 
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Abstract
This study aimed to evaluate the efficacy of some compounds of plant origin (carvone, 1,8-cineole, cuminaldehyde, linalool,) and Yucca shidjira extract compared to malathion as a recommended insecticide for protection of wheat grains against both the rice weevil Sitophilus oryzae and the red flour beetle, Tribolium castaneum, based on its effect on the death and progeny of adult insects. Also, to study the mechanism of the toxic effect of the tested control agents against both rice weevil and red flour beetle by their effect on some enzymes such as cholinesterase, α-amylase and alkaline phosphatase. Moreover, to evaluate the effect of the tested control agents on the quality of the stored treated wheat grains. The results of the study showed the high effectiveness of the tested control agents against the tested insects, both on the death of adult insects and their exit, especially when used as smoking materials. The insecticidal effect of the tested materials against rice weevil or flour beetle may be due to disruption in the activity of some enzymes such as acetylcholinesterase, α-amylase and alkaline phosphatase. The quality of the stored and untreated healthy wheat grains that were treated with the tested control agents did not change, and in some cases it was better compared to the intact stored unprocessed grains, whether the level of weight loss or its protein and carbohydrate content, etc.