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Year: 2016  |  Volume: 15  |  Issue: 3-4  |  Page No.: 52 - 64

Incidence of Soybean Root and Stalk Rot Diseases as a Result of Antioxidant and Biotic Agents

K.M. Abd EL-Hai, Mohammed S. Elhersh and Mohammed K. Mahmoud    

Abstract: Background and Objective: Soybean is currently infected by soil-borne fungi, which cause shortage in yield productivity and seed quality. Wherein, the application of bioagent became urgent demand to avoid the side effect of agrochemicals. The aim of study is to investigate the incidence of soybean rot diseases and how to alleviate the causal pathogens of disease. Methodology: Infected soybean samples with typical symptoms of root and stalk rot diseases were collected and the causal fungal pathogens were isolated and identified, i.e., Fusarium solani, Rhizoctonia solani and Macrophomina phaseolina. Antioxidant (benzoic, citric and salicylic acids) and biotic agents (Bacillus subtilis and Saccharomyces cerevisiae) were used as control agents against fungal pathogens. Results: The cultivar Giza 111 was more susceptible to fungal pathogens that cause pre and post damping-off compared to the another one. Interestingly, low concentration of antioxidants showed to be more active compared to higher concentration, however, both Bacillus subtilis and Saccharomyces cerevisiae showed more active at the higher doses. As well as, the plant heights and branches numbers increased significantly among treatments with both antioxidants and biotic agents in both seasons and cultivars. Seed quality including protein, oil and phosphorus percentages showed increasing as the result of parameters under study. Conclusion: Biotic agents, i.e., B. subtilis and S. cerevisiae, as well as, antioxidants were effective in decreasing pre and post damping-off, increasing plant height and branches number. Seed quality was increased as the result of all treatments.

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