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The article presents the results of studying the influence of treatments with electromagnetic fields of extremely low and super low frequency and the microbial pesticide Vitaplan containing bacteria Bacillus subtilis on the resistance of apples cv. Idared to microbial decay during storage, on the peroxidase activity change and the total polyphenolic content. It was found that the degree of damage to apples artificially infected with Aspergillus niger depends on the treatment parameters before storage. The highest degree of inhibition of the development of lesions caused by the phytopathogen was revealed in samples treated with SLF EMF with parameters 35 Hz, 12 mT and 30 min. It was also found that all the considered types of treatments increase the activity of peroxidase during storage during the first two weeks, as well as the content of polyphenolic substances. The data obtained suggest that the recorded increase in the resistance of apples to microbial decay may be the result of the induction of resistance under the influence of ELF/SLF electromagnetic fields and the microbial pesticide Vitaplan. The results of the study can be used to develop new methods for storing apples.

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