TY - JA AU - Coakley,S.M. AU - Line,R.F. TI - Climatic variables that control development of stripe rust disease on winter wheat U1 - 82-820932 PY - 1981/// KW - Fungal diseases KW - AGROVOC KW - Meteorology and climatology KW - Plant diseases KW - Wheat triticum spp N1 - 10 ref.; Summary (En) N2 - The frequency and severity of the stripe rust disease (caused by Puccinia striiformis) on winter wheat in the Pacific Northwest of the U.S.A. has increased since 1958 in association with climatic variation. From 1968-1979, rust intensities on 'Gaines' wheat were most highly correlated with accumulated negative degree days (NDD) between 1 December and 31 January and positive degree days (PDD) between 1 April and 30 June. NDD and PDD were calculated from a 7 deg C base. Linear regression equations using NDD alone accounted for 76 of the variation in stripe rust. When NDD and PDD were combined, 88 of the variation in stripe rust was explained. When a T2 - Climatic Change ER -