The biological effect of some plant oils on the life of the Callosobruchus maculates (Fab) (Coleoptera : Bruchidae)

Abstract

This study used three vegetable oils with different concentrations (1.5, 3, 4.5 ml per 20gm/grain), the treatment that did not use any vegetable oils served as a control. Ten C. maculatus insects were released into a Petri dish containing 20g of cowpea beans with appropriate vegetable oil concentration. After closing, leave at room temperature. Records were kept of seed weight loss, egg laying, adult emergence, and death. No significant differences were observed when increasing the concentrations of vegetable oils. Cereals treated with siwak oil recorded the highest mortality rates, reaching 52.91% after 96 hours of treatment at a concentration of 4.5 ml. It was observed that the laying of eggs decreases with the toothpick oil, as it reached 75 eggs at a concentration of 4.5 ml. The lowest percentage of weight loss was with the toothpick oil at a concentration of 4.5 ml, which amounted to 4.5%. It was noted in the emergence of adults that the highest percentage of appearance was with the oil of the Wandering Jew, which amounted to 31 insects. It was also noted that the killing increases with increasing concentration and increasing the duration of exposure.