Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1998.295.298Aslam KhanMuhammad gene TrevathanLarry Eu 4199814Environmental data recorded by a weather station installed in experimental wheat plots established during 1991-93 were used to develop leaf rust predictive model for economic fungicide application. Natural inoculum was relied upon for infection. Five fungicides were evaluated on five varieties during the spring of 1992 and 1993 in 15 treatments based on mode of active ingredient, crop growth stage (GS), initial appearance of leaf rust symptoms and environmental conditions. Fungicide treatments suppressing disease severity and enhancing the yield of rust tolerant varieties were subjected to economical analysis. Weekly maximum air temperature (23°C), minimum air temperature (12°C), and average air temperature (17°C), soil temperature (29°C), rainfall (0.88 cm), relative humidity (86 percent), wind movement (12 km h1), solar radiation (26 mj/m2) and dew point (17°C) resulted in greater leaf rust severity at Starkville, in 1992. Weekly maximum air temperature (25°C), minimum air temperature (22°C), and average air temperature (21°C), soil temperature (27°C), rainfall (3.77 cm), relative humidity (90 percent), wind movement (28 km h1) solar radiation (19 mj/m2) and dew point (16°C) resulted in lower leaf rust development in 1993. Application of flusilozle alone, or flusilazole or propoconazole at GS-9 followed by mancozeb at GS-10.5 was recommended for maximizing profitable yield from Coker 9323 and Pioneer 2555.]]>Anonymous,19921992Anonymous,19931993Burleigh, J.R., A.A. Schulze and M.G. Eversmeyer,196953648651Burleigh, J.R., M.G. Eversmeyer and A.P. Roelfs,197262947953Cooke, F.T. Jr., J.M. Anderson and A.M. Heagler,1972794160Cooke, Jr.F.T., J.M. Anderson, D.W.Jr. Parvin, A.M. Heagler, K.W. Paxton, S.H.Jr. Holder Junior and J.G. Hamill,1975834179Christ, B.J. and J.A. Frank,1989Septoria and leaf rust epidemics on winter wheat.]]>73148150Eversmeyer, M.G., J.R. Burleigh and A.P. Roelfs,197363348351Eversmeyer, M.G., C.L. Kramer and Z.M. Hassan,1988Puccinia recondite infection structures.]]>72409412Eversmeyer, M.G., C.L. Kramer and L.E. Browder,1984Puccinia recondite and P. graminis inoculum in the great plains.]]>68392395Hyde, P.M.,1982Puccinia recondite.]]>312530James, W.C.,1971Pages: 90Pages: 90Khan, M.A. and M.B. llyas,19979163165Kolmer, J.A.,1992Puccinia recondite f. sp. tritici in Canada.]]>76618621Leonard, K.J., A.P. Roelfs and D.L. Long,1992Puccinia recondite f. sp. tritici in different areas of the United States.]]>76500504Pretorius, Z.A., F.H.J. Rijkenberg and R.D. Wilcoxson,1988Puccinia recondita f. sp. tritici.]]>373644Rakotondradona, R. and R.F. Line,198468112117Tomerlin, J.R., M.G. Eversmeyer, C.L. Kramer and L.E. Browder,1984Puccinia recondite f. sp. tritici.]]>74225229Trevathan, L.E.,19901990Turban, E.,1992Spurlock, S.R. and D.H. Laughlin,1992Version 3.0 (Agricultural Economics Technical Publication No. 88).