Giza-1 and Miak cultivars were resistant to M. phaseolina (Tassi) Gold whereas Import 61 was the most resistant cultivar to P. oxysporum Schlecht. However, Hybrid 894 and Hybrid 8941 Were susceptible to both fungi. Disease incidence increased by the increase in both depth of sowing and intervals of irrigation especially with H. 894 and H. 8941 as regards M. phaseolina and with shortening irrigation intervals with F. oxysporum. On the other hand Giza-1 was the least affected cultivar. As regards yield and yield components, Miak together with Giza-1 could be recommended for cultivation in A.R.E. for oil and other purposes. The whole plant extract media of H. 8941 and H. 894 were the best media for the linear growth of M. phaseolina while that of Giza-1 was more favourable for growth of F. oxysporum. Fungal filtrates reduced the germination of seeds of all tested sunflower cultivars especially by ageing of filtrates However, Giza-1 was less affected in contrast with H.894. Similar results were obtained with seedlings.