The influence of nine sulfonamide compounds on mycelia growth and reduction of artificial infection of Botrytis Febae the causative of brown spots on faba bean plants. In vitro tests showed variable effect of sulfonamide compounds on A.niger; B.Fabae; F.oxgsporium and Rh. solani. Most sulfonamide compounds reduced the colony diameter of the fungus. The high reduction in colony diameter of pathogenic fungi was recorded with sulfonamide compounds No 1, 2 and 3. On the contrary sulfonamide compounds No, 6. And 9 recorded low reduction in diameter colony ones. While compounds No, 4,5,7 and 8 revealed very low reduction compared with anther compounds All sulfonamide compounds were decreased necrotic area (brown spots ) of B.fabae on faba bean leaves. Higher efficiency to reduce the necrotic area (brown spots) found when using sulfonamide compounds No 1,4,6,9 Followed by compound, No 2, 3, 7 and compounds No 5 and 8. Key words: Chemical inducers,Acquire resistance