Toxic Effects of Quercus coccifera (L.) Leaf Extract on Tetranychus urticae Koch, Callosobruchus maculatus F. and Plodia interpunctella (Hubner)

In this study, toxicities of the leaf extract of Quercus coccifera (L.) were tested against Tetranychus urticae Koch (Acarina: Tetranychidae), Callosobruchus maculatus F. (Coleoptera: Chrysomelidae) and Plodia interpunctella (Hubner) (Lepidoptera: Pyralidae). The adults of the T. urticae and C. maculatus and the 34th instars larvae of the P. interpunctella were used in the experiment. Plant extracts were used at the five different concentrations (20%, 10%, 5%, 2.5%, 1.25% (w/w)). The studies were conducted under the laboratory conditions with 28 +/- 1 degrees C, 65 +/- 5% relative humidity (16:8 L/D time period for T. urticae). Trials were replicated for three time. Mortality was recorded for 24 and 48 hours post-treatment. Q. coccifera extract was found to be quietly effective against T. urticae adults with a 98% mortality rate in 48 hours and at 10% concentrations. The highest death rate (96%) of C. maculatus adults was determined after 48 hours of post treatment and at 20% concentration. Toxic effect of Q. coccifera leaf extract to P. interpunctella larvae was determined to be low.