Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2000.874.875Tribolium Castaneum Hbst. (Coleoptera:Tenebrionidae)]]>HussainImtiaz Makhdoom SabirArshed SuhailAnjum AkramWaseem 5200035Study was carried out to determine the level of resistance in Tribolium castaneum (Hbst.). Strains collected from various localities of the Punjab and exposed to different concentrations of phosphine, viz; 0.01, 0.02, 0.03, 0.04 and 0.05%. Higher concentration (0.05 percent) gave higher mortality (90.721-100 percent) under test. While LC 50 values calculated for Sargodha, Kalar-Kahar, Chiniot, Moza Matu, Noorwala, Okara, Jhang, Mamukanjan, Faisalabad, Lahore and susceptible strains of T. castaneum were 0.0220, 0.0115, 0.0176, 0.0132, 0.0136, 0.0163, 0.2010, 0.0186, 0.0193, 0.0192 and 0.0030, respectively, and the level of resistance in these strains ranged from 3.787 to 7.255.]]>Hamid, A., M. Ahmad, M. Hassan and A.A. Sabir,1988Tribolium castaneum (Hbst.) and Rhyzopertha dominica (F.).]]>104952Hobbs, S.K. and E.J. Bund,1989T. castaneum to sub lethal treatments with phosphine.]]>25137146Kem, T.R.,1978Tribolium castaneum (Herbst) to some fumigants.]]>2206288Nakakita, H. and J. Kurock,1986112126Pacheco, I.A., M.R. Santori and R.W.D. Taylor,199020144154Rajendran, S.,1992Tribolium castaneum (Coleoptera: Tenebrionidae).]]>82119124Saxena, J.D. and S.K. Bhatia,1980Tribolium castaneum (Herbst) for resistance to phosphine.]]>5301306Taylor, R.W.D.,1989311014Winks, R.G.,198617165174