Abstract :
Chemical composition of botanical oil garlic (Allium sativum) and chamomile (Matricaria camomela), its toxic and repellent activity were investigated against three stored product insects, Callosobruchus maculatus (Fab.), Trogoderma granarium (Khapra beetle), and Tribolium castaneum (Herbst). Malathion dust was used as a standard chemical insecticides against stored product insects while neem oil was implicated in this study as a known repellent agent. Based on LC_50 values of adults, it is quite clear that garlic, in generall had a high toxic effect against adult stage of C. maculatus. Complete mortality was achieved at a concentration of 50 and 100 ppm of garlic against C. maculatus and T. granarium after 2 weeks post treatment. The repellent action of the tested essential oils (garlic, chamomile and neem) was increased with the increasing of concentration with the tested insect species. There was highly significant differences between the repellent effect of neem oil with the three tested insects compared with that of chamomile and garlic oils. Malathion dust had the highest action against the tested insects compared with the two oils used in this study.
