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