Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1999.623.626AlamM. Sardar S. Shahid Shaukat Mubarik Ahmed Shamim Iqbal Akhlaq Ahmad 3199923Wheat and rice godowns in Pakistan have three to twelve years history of phosphine fumigation. Coleopterous adults and larvae from these godowns were collected, cultured and tested for phosphine resistance. Strains of Tribolium castaneum Hbst., Rhizopertha dominica F. and Trogoderma granarium Everts., exhibited varied levels of resistance, whereas all four strains of Sitophilus oryzae L. showed marginal resistance over the susceptible strain. Certain strains of R. dominica and T. castaneum were found to have 80-fold resistance. The possible causes of resistance and the methods of their control are discussed.]]>Ahmed, M.,19891989Anonymous,19751975Attia, F.I. and H.G. Greening,1981139397Bell, C.H., B.D. Hole and P.H. Evans,1977Rhyzopertha dominica (F.)(Coleoptera: Bostrichidae).]]>139194Borah, B. and B.S. Chahal,1979Trogoderma granarium Everts to phosphine in the Punjab.]]>1979Charkrabarti, B. and C.H. Bell,199320992995Champ, B.R. and C.E. Dyte, 19761976Chaudhry, M.Q., H. Ahmed and M. Anwar,198929177187Finney, D.J.,19642nd Edn.,pp: 318pp: 318GASGA.,19861986Mills, K.A.,19831983pp: 98101Mills, K.A., A.L. Clifton, B. Chakrabarti and N. Savvidou,19901990pp: 11811187Monro, H.A.U., E. Upitis and E.J. Bond,1972Sitophilus granaries (L) (Coleoptera, Curculionidae) to phosphine.]]>8199207Nakakita, H. and R.G. Winks,1980Triboliurn castaneum selected from adults with phosphine.]]>1980Nakakita, H., T. Saito and K. Iyatomi,1974Sitophilus zeamais Motsch.(Coleoptera, Curculionidae).]]>108792Price, L.A. and K.A. Mills, 1988245159Rajendran, S.,1992Tribolium castaneum (Coleoptera: Tenebrionidae).]]>82119124Taylor, R.W.D.,19861986Taylor, R.W.D.,1989311014Taylor, R.W.D. and D. Halliday,19861986pp: 607613Tyler, P.S., R.W. Taylor and D.P. Rees,1983251013