Tomato (Lycopersicon esculentum Mill.) early blight caused by Alternaria solani is one of the most important economic diseases, which causing considerable loss in their yield and quality. Trichoderma viride, Bacillus subtilus and actinomycetesisolate A were the most effective bioagents on decreasing linear growth of A. solani. All bioagents tested reduced disease incidence using detached leaf and/or intact leaf techniques, when treated 2 and 7 days before inoculation with the pathogen. T. harizanum was the most effective isolate on reducing percentage of disease protection 2 and 7 days before inoculation (96.57 and 89.84) followed by  T. viride (92.65 and 83.77%)then B. subtilus (83.34 and 66.89) using detached leaf. The same trend was obtained in case intact leaf, T. harizanum was the most effective isolate on reducing disease severity, percentage of disease and increase percentage of protection 2 and 7 days before inoculation (16.44 and 58.62 and 38.28 at two days and 22.26, 62.43 and 35.17 afeter 7 days) followed by B. subtilus then T. viride. Generally bioagents tested were most effective using detached leaf than intact leaf.  In vitro experiments, chitosan and salicylic acid (SA) 4% were the effective concentrations on reducing growth of A. solani (84.44 and 67.77 %) and reducing spores germination (55.31 and 81.56 %). All the tested concentrations of chitosan and SA as inducer of resistance in tomato plants, which reduced number and diameter of lesion as well as percentage of disease and increase percentage of protection 7 days after treatment using detached and intact leaf techniques. Both water and ethanol extracts of garlic were the most effective on inhibition the mycelial growth, spore germination and disease parameters using detached and intact leaf techniques, followed by ginger extract.