Evaluation the efficiency of clove oil (Syzygium aromaticum) in controlling cowpea seed beetle, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)

Abstract

The present work aimed to studying the effect and evaluate the effectiveness of the clove oil as a natural product against the adults of the cowpea seed weevil, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) under controlled laboratory conditions.The study was carried out at the Biology Department, Faculty of Science, Princes Nora University, Al Riyadh, Saudi Arabia, using four concen trations of clove oil (5, 2.5, 1.25 and 0.12 mg/L). Results obtained indicated that, the mortality percentage of the adult beetle s increased with the increase of the oil concentration and the period after treatment. The percentage of mortality was 63.333% two days after treatment at the highest concen tration (5mg/L), increased to reach 96.667% four days after treatment at the same concentration. At the lowest c oncentration (0.12 mg/L), the percentage of mortality wa s 73.333% four days after treatment and the LC 50 value was 2.188 mg/l and the LC 90 was 75.445 mg/l after two days from treatment.