Fifty wheat vanetles representative of the major spring types were tested in the Fourth International Spring Wheat Yield Nursery ( ISWYN). Results were obtained from 63 locations throughout the spring wheat regions of the world. Data received included yield and other agronomic and disease traits. These data were analyzed statistically and correlations were calculated between the means of all traits measured for each location. The overall location mean yields reflect previous ISWYN results with Tnia 66, Pitic 62, Siete Cerros, Penjamo 62 and Super X, the 5 top yielding varieties in that order. Tobari 66 gave the best performance under all three rusts over all locations, but ranked 11 for yield.12