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Current study evaluated the effect of four plant oils, four plant powders, two inert dusts compared to Malation against one of the major stored product insects (cowpea beetle). Based on percent of reduction obtained after five months of Callosobruchus maculatus treatment, results showed that plant oils and clove oil were achieved the strongest effect for reducing the number of emerged adults of the tested insect followed by spearmint and orange depending on LC50 values. For inert dusts and malathion, malathion showed the highest effect. While the two inert dusts, silica and katelsous had nearly equal action. For plant powders, the results had the same trend with plant oils where the clove powder had the first order for reducing the number of emerged adults followed by spearmint and orange.
El-Talpanty et al. (Fri,) studied this question.