Biocidal Effect of Methanolic Extracts from the Fruits of Capsicum frutescens L. (Solanaceae) on the Larvae and Adults of Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae)

The efficacy was tested at concentrations 0, 0.025, 0.05, 0.075 and 0.1 g of powder per g of wheat grain and the methanolic extract at 0, 10, 20, 25 and 30 gl-1 of the fruits of Capsicum frutescence on the death of the first instar, the instar and adults of Tribolium castaneum. The results of the study indicated that there is a direct relationship between the percentages of larval and adult mortality and the concentrations of methanolic extract and powder used in the experiments.. The highest mortality rates were recorded in all stages of the insect during the first 24 hours after the treatment, and the mortality rate decreased significantly on the second and third days of the treatment compared to the mortality rates recorded on the first day, and the highest mortality rates were recorded in first stage larvae 70 % and fifth stage larvae 56.7 % during the first 24 hours of their treatment with a concentration of 30 g.l-1 from the methanolique extract of Capsicum frutescence, and at the same concentration the highest rates of cumulative mortality were recorded after 72 hours of treatment, were in the first stage larvae was 96.7% and in the fifth stage larvae 90%. At the same concentration, the highest rates of cumulative loss were recorded after 72 hours of treatment. They were 92% in first instar, 87% in fifth instar, and 67% in adults.