INSECTICIDAL ACTIVITY OF THREE AROMATIC AND MEDICINAL PLANTS AGAINST Callosobruchus maculatus (FAB.) (Chrysomelidae: Bruchinae)

The toxicity of plant powders of the leaves of noble laurel (Laurus nobilis), and the fruits of hot pepper (Capsicum frutescens) and clove (Syzygium aromaticum) were tested on healthy cowpea seeds against the bruche Callosobruchus maculatus, The aim of this study was to evaluate some biological parameters of the insect, namely the fecundity and mortality of the adults Callosobruchus maculatus. The experiments by the contact test of the three vegetable powders were carried out under laboratory conditions (27 ± 1°C, 70 ± 5% % RH and a photoperiod of 14h (light) / 10h (dark).

The results indicate that the powder of Capsicum frutescense has a very effective effect from the dose of 0.1g on the fecundity of C. maculatus females while its effect is very limited on the mortality of adults C. maculatus whatever the dose used, the powder of Syzygium aromaticum inhibits the laying of eggs C. maculatus females from a dose of 0.5 g and causes total mortality in all three doses used after 5 days of exposure, the powder of laurus nobilis from the dose ( 0.5 g) has no effect on the fecundity of C. maculatus females. However, a small decrease is recorded for doses greater than or equal to 1g and causes a small lethal effect on adults C. maculatus.