Leaves and Flowers Insecticidal Activity Investigation of Salvia officinalis L. against Sitophilus oryzae L

To lessen the use of synthetic pesticides and their negative effects on the environment, leaves and flower extracts of Salvia officinalis L. were obtained with methanol and distilled water as solvents. These extracts were evaluated under laboratory conditions using filter diffusion method for their insecticidal effect against adult’s rice weevil Sitophilus oryzae L. individuals at 0.5, 1 and 1.5 concentrations and made observations after 24 hours. Methanolic extract of leaves was effective and caused mortalities (100 %, 80 % and 60 %) respectively at 1.5, 1 and 0.5 concentration while flower extract in methanol showed significant insecticidal effect (60%, 20% and 40%) against 1.5%, 1% and 0.5% concentrations respectively. The aqueous leaves extracts showed good insecticidal activity and caused mortalities (60%, 40% and 20%) at 1.5, 1 and 0.5, while aqueous flower extract in methanol did not show any significant insecticidal effect (40%, 20% and 0%) against 1.5%, 1% and 0.5% concentrations respectively. The results obtained suggest that we can make bio insecticides based on leaves methanolic extracts from plant for use in integrated pest management.