Evaluation of the yield stability of a group of CIMMYT tropical maize populations across international environments, measured by the performance of varieties derived from them, showed that the populations Mezcla Tropical Blanca, La Posta and Amarillo Dentado produced the most stable varieties across environments. Mezcla Tropical Blanco and Amarillo Dentado produced selections with good stability in both low and high yielding environments while La Posta produced varieties with better performance in favourable environments. ‘Across-site’ varieties were not consistently more effective than ‘site-specific’ varieties in improving yield stability. Varieties selected for some specific population-environment combinations have been very stable in other areas of the world.
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