Resistance of strains of rice weevil, <i>Sitophilus oryzae</i> (Coleoptera: Curculionidae) to pirimiphos methyl

  • O. O. Odeyemi Biology Department, Federal University of Technology, P.M.B. 704, Akure, Ondo State, Nigeria Email: odesol2004@yahoo.com
  • M. O. Ashamo Biology Department, Federal University of Technology, P.M.B. 704, Akure, Ondo State, Nigeria
  • R. O. Akinkurolere Biology Department, Federal University of Technology, P.M.B. 704, Akure, Ondo State, Nigeria
  • A. A. Olatunji Biology Department, Federal University of Technology, P.M.B. 704, Akure, Ondo State, Nigeria

Abstract

Insecticidal resistance of five strains of Sitophilus oryzae (L.) to pirimiphos methyl (Actellic®) was investigated in the laboratory at 28 ± 2oC and 89 ± 5% relative humidity. Rice infested by S. oryzaewas sampled from Nigerian stores in Akure (Ondo state), Ibadan (Oyo state), Ikotun (Lagos state) and Ilesha (Osun state) and a laboratory culture (in Akure). Twenty adult weevils from each location were exposed to filter papers impregnated with liquid pirimiphos methyl at one of seven concentrations ranging from 0.0 to 5.0%. Mortality rates of the rice weevils were observed at 3, 6 and 24 h after treatment. The mortality of weevils increased with increasing concentration and period of exposure. Irrespective of the strain, 100% mortality was observed in all the treatments at 24 h after exposure to pirimiphos methyl. Weevils sampled from Ibadan were the most resistant, while laboratory strains were the least resistant at 2 and 5% concentrations.

Keywords: Strains, insecticide, Pirimiphos methyl, Resistance, Sitophilus oryzae.

Veröffentlicht
2010-09-02