Repellency and Residual effect of Neem or Mineral Oil on the Distribution and Oviposition of Maize Weevil, Sitophillus zeamais Motsch

Abstract

The Oviposition rate of the maize Weevils was greatly reduced when they were held with corn kernels treated with 1,000 and 10,000 ppm neem oil in acetone. The cleteramental effect of the 1,000 ppm neem oil treatment was lost by 30 days after treatment, but the 10,000 ppm retained its effect for 60 days. Doses of 1,000 and 10,000 ppm of neem oil repelled weevils from corn kernels treated 24 h before the test, however, repellency disappeared after 15 days in 1,000 ppm, but not the 10,000 ppm.