Browsing by Author "Gunathilake, G.G.V.L."

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    Bioactivity of Tithonia diversifolia (Hemsl), Tagetes erecta L. and Lantana camara L. against Grain storage Pests Tribolium castaneum (Herbst)
    (Uva Wellassa University of Sri Lanka, 2011) Gunathilake, G.G.V.L.; Henagamage, A.P.; Karunathilake, A.A.K.; Hapuarachchi, H.A.C.S.
    Note: See the PDF Version According to the viewpoint of economists, farmers have an opportunity to take advantages of seasonal price rises, but the benefits can only be achieved if grain is deal longer on the farm with no deterioration in quality. Then it appears the necessity of post-harvest management. Post-harvest deterioration of grains is principally causal by bi0logical spoilage organisms including insects, fungi and small vertebrates (Golob e/ at., 2002). Control of these insects relies heavily on the use of synthetic insecticides and fumigants. But their widespread use has led to some serious problems including development of insect strains resistant to insecticides, toxic residues on stored grain, toxicity to consumer and increasing costs of application (Jbilou et at., 2006; Golob ei at., 1999), Thus, several of natural plant extracts had been tried in the control grain storage pest insects with the view of advantages such as local availability, little or no toxicity to humans and simple preparation procedures (Okigbo ei at., 2009). The present study was undertaken to analyze the insecticidal activity of Laiitana carnal a L., Tagetes erecta L. and Tilhonia ‹diversifolia (Hemsl) with the aim of development of plant base insecticidal fumigants to apply on grain storage pests. These are underutilized plants in Sri Lanka which are heavily used in conventional farming to eliminate insects. Also they have been shown to have repellent and insecticidal activities against certa in insects (Adedire ct at., 2004, Nike:on e/ ml., 2009; Ogendo e/ n/. 2004). Insects, red flower beetle, Tribolium caslaneum (Herbst) is considered as a major pest of stored grains (Jbilou e/ uf., 2006).