Abstract
Efficacy of three fungicides (Basten 50 SC , Rooty 72.2% SL and Ziram) were evaluated in vitro against three genera of plant pathogenic fungi : Alternaria sp. , Pythium sp. and Verticillium sp. by poisoned food teqnique at different concentrations i. e. (50, 100, 200, 300 and 400)% . Radial growth of mycelia was recorded after 3rd, 5th and 7th day of treatment. The fungicides efficiency was varied according to fungicide type, their concentration, fungi and incubation period. All the fungicides inhibited pathogenic fungi significantly as compared with controls. Basten fungicide had marked significant inhibitory effect against tested fungi as compared with Rooty and Ziram fungicides. Positive relationships between fungicide inhibitory and concentrations. Pythium sp. showed the highest sensitivity to fungicides represent by completely inhibited growth fungus (100% percent of inhibition), while Alternaria sp. was more resistant to fungicides, although presence of gradual decline in growth rate with increasing fungicides concentration to reach 18.33mm (67.14%) at 400% .Mycelial radial growth of Alternaria sp., Pythium sp. and Verticillium sp. proved differences in fungicides efficiency at different incubation periods (3rd , 5th and 7th days) which did not show a consistent pattern of growth under the effect of studied fungicides.
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