INSECTICIDAL ACTIVITIES OF THE LEAVES OF NISHINDA (VITEX NEGUNDO L. VERBINACEAE) AGAINST TRIBOLIUM CASTANEUM HBST.

Insecticidal activities of nishinda, Vitex negundo L. on red flour beetle (Tribolium castaneum Hbst.) was investigated. Nishinda leaves were sequentially extracted with organic solvents petrolium spirit, ethyl acetate, acetone and methanol. Efficacy of these extracts was determined against adults and different larval instars of three strains of T. castaneum using residual film method. The LD50 values of the extracts were not similar but it showed higher degree of toxicity on both larval and adult insects. Among the solvents, methanolic extracts elucidated more toxicity on both adult and larval instars. The degree of toxicity according to solvents was methanol petrolium spirit acetone ethylacetate. Among the strains, FSS-II showed the highest degree of susceptibility to all types of extracts studied. The susceptibility order according to insect strains was FSSII CTC-12 KANO.