Plant Pathology Journal1812-53871812-5425Asian Network for Scientific Information10.3923/ppj.2002.54.57ArifMohammad StephenMuazam HassanSher 2200212Soybean mosaic potyvirus (isolates S1 and P1) caused significant reduction in plant height, number of pods/plant, pod length, number of grains/pod and 100 grains weight in mechanically inoculated eight soybean varieties. The reduction in plant height of varieties Recondita, Ajmiri, Kingsay, Weber-84, Swat-84, Epps, Malakand-96 and Kharif-93 due to S1 isolate was 14.9, 15.2, 9.5, 11.0, 45.0, 14.5, 5.2 and 21.1 %, respectively. While in case of P1 isolate the reduction was 6.3, 29.5, 6.0, 47.6, 34.4, 26.2, 1.8 and 15.8 %, respectively. Analysis of variance of the yield components indicated that both isolates (S1 and P1) caused a significant reduction in pod length of all eight varieties. A 4.2 to 23 % reduction occurred in pod length due to S1, while 5 to 24 % reduction was observed in case of P1 isolate. Isolate S1 caused 1.5 to 68.6 % and P1 6.6 to 31.1 % reduction in number of pods per plant. SMV-S1 and P1 caused significant reduction in number of grains per pod. However, the percent reduction due to S1 was 4.8 to 24.7 %, while reduction due to P1 was 10.5 to 29.3 %, respectively. Both isolates affected the weight of grains significantly. The percent reduction was 5.3 to 21.7 and 7.3 to 20 due to SMV-S1 and P1 isolates, respectively.]]>Abney, T.S., J.O. Sillings, T.L. Richards and D.B. Broersma,197669254265Arif, M. and S. Hassan,2000321262130Arif, M., A. Ali, M. Stephen and S. Hassan,2000319211925Bos, L.,1972Bowers, Jr. G.R. and R.M. Goodman,197969569572Cho, E.K. and R.M. Goodman,197969467470Cho, E.K. and R.M. Goodman,19822211331136Galvez, G.E.,196353388393Goodman, R.M., G.R. Bowers Jr. and E.H. Paschal,197919264267Goodman, R.M. and J.H. Oard,198064913914Hill, J.H. and H.I. Benner,198070236239Hill, J.H. and H.I. Benner,198097272281Hill, J.H., T.B. Baily, H.I. Benner, H. Tachibana and D.P. Durand,198771237239Irwin, M.E. and R.M. Goodman,19811981pp: 181-220pp: 181-220Kwon, S.H. and J.H. Oh,198020403404Lim, M.,198575199201Milbrath, G.M. and M.M. Soong,1976Phaseolus vulgaris L. cv. Top crop.]]>87255259Quiniones, S.S., J.M. Dunleavy and J.W. Fisher,197111662664Ross, J.P.,196757465467Ross, J.P.,196852344348Ross, J.P.,197717869872Ross, J.P.,196959829832Sinclair, J.B. and P.A. Backman,198934th Edn.,pp: 106pp: 106Soong, M.M. and G.M. Milbrath,198070388391