Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2002.915.918Nilaparvata lugens (Stål) in Resistant and Susceptible Rice Varieties of Bangladesh]]>MozaddedulHaque N.M.M.Haq Mainul HasanRezaulKarim A.N.M.9200259Studies were conducted to find the effect of hormoligant (sub-lethal doses of insecticides) on brown planthopper Nilaparvata lugens(Stal). The LC50 value of Ripcord 10EC both for 3rd and 5th instar nymphs of BPH was 0.0000142%. The LC50 value of Dimecron 100WSC and Diazinon 60EC for 5th instar nymphs of BPH were 0.00001987 and 0.000651%. But the effect of hormoligant (i.e. the effect of LC50and LC10 dosages of Diazinon 60EC on the test populations) was observed in 1st, 2nd, 5th, and 6th generations of the treated populations; i.e. the populations in LC10 in BPH resistant (BRRI dhan 31) and susceptible varieties (BR 3) increased at the above generations compared to LC50 populations of BPH.]]>Abbott, W.S.,192518265267Anonymous,1968Anonymous,1978Anonymous,19841984pp: 110Anonymous,1995pp: 52pp: 52Alam, S. and A.N.M.R. Karim,19961996pp: 1029Buenaflor, H.G., R.C. Saxena and E.A. Heinrichs,198161314Chelliah, S.,198051011Chelliah, S. and E.A. Heinrichs,19841984pp: 107115Chelliah, S. and S. Uthamasamy,1986237182Coombes, D.S.,1983M. persicae.]]>43839Islam, Z., M.A. Nahar, M.A. Hossain, M.A.T. Mia and H.U. Ahmed,20012001pp: 97106Kerns, D.L. and S.D. Stewart,2000944149Krishnaiah, N.V. and M.B. Kalode,1987Nilaparvata lugens (Stål).]]>49220229Morse, J.G.,199817266269Oka, I.N.,1978pp: 28pp: 28Russell, R.M., J.L. Robertson and N.E. Savin,197723209213Stapley, J.H., Y.Y. Jackson and W.G. Golden,1979pp: 233-239pp: 233-239Yoshioka, K. and Y. Yamaskai,19811981pp: 64-68pp: 64-68