In Algeria, fungal diseases are the most important biotic limiting growth of garlic (Allium sativumL.). The application of salicylic acid is known as a plant hormone that has the signaling role in defence responses, including systemic resistance acquired. Gibberellic acid (GA3) is a very powerful hormone whose natural appearance in plants controls their development. This study aimed to evaluate the affectivity of certain concentrations of salicylic acid (SA) and gibberellic acid (GA3) under laboratory and greenhouse conditions against the phytopathogenic fungus Fusariumverticillioidesand on the height of garlic (Allium sativum L.). The results showed that the inhibitory effect of (SA) on the development of this phytopathogen increased with increasing concentration. In the case of gibberellic acid, the concentrations 100 ppm and 150 ppm were the most inhibitory, its effect was more marked on the fungus during the first three weeks of infection. Inhibition decreases sharply during the fourth week of infection. Gibberellic acid at 150 ppm was an inhibitor over the first, second and third weeks. For morphological parameters, the results showed that the concentration of 150 mg / l recorded the highest values of the height of garlic for both growth regulators. In vitro, the diameter of the colony decreases significantly to 200 mg /l for salicylic acid and 150 mg / l for gibberelic acid. Therefore, our results showed that garlic treatment with (SA) and (GA3) was effective in reducing infection of the disease and increasing yield.
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