Introduction, collection, preservation and evaluation of germplasm materials is absolutely necessary in any result-oriented breeding programme. Forthis reason, 34 sunflower hybrids introduced from three different countries have been evaluâted in the field for two consecutive years (1986 and 1987). The performance of the syn 1 (F1) relative to the syn 2 indicate a mean reduction in the syn 2 generation of 62, 48,3r and ?À per cent for seed yield, head diameter, plant height and number of leaves per plant, respectively. The use of synthetic cultivars and the method of their devlopment were discussed.