Abstract
Variation among four organic acids (tannic acid, oxalic acid salicylic acid and ascorbic acid), four salts (Potassium chloride, dipotassium phosphate, sodium chloride and disodium phosphate) and two growth regulators (Indole acetic acid and indole butyric acid) on the percentages of root rot disease caused by Macrophomina Phaseolina, Rhizoctonia solani and Fusarium oxysporum f. sp. basilici. Salicylic acid was the most effective treatments at 8 mM for decreasing pre-emergence damping off in case of M. phaseolina and F. oxysporum f. sp. basilici while, oxalic acid was the most effective acids as inducer in case of R. solani. Potassium chloride at 4% was the most effective salts as inducer for decreasing percentages of emergence damping off, indole butyric acid at 400 ppm gave the highest effect in case of M. phaseolina and F. oxysporum whereas, Indole acetic acid at 400 ppm gave the best in case of R. solani. Two biocides Bio-Arc (Bacillus megaterium) and Bio-Zeid (Trichoderma album) were significantly effective in controlling root rot disease incidence. Seeds treatment of basil plants with different inducers resulted in an increase in activity of peroxidase and chitinase. Treatment basil plants with these inducers induced new proteins and led to increase percentages of main components of basil essential oil.