Abstract            Volume:10  Issue-2  Year-2022         Original Research Articles

Online ISSN : 2347 - 3215 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcret@gmail.com

Alternaria solani Sorauer is a fungus that causes damage to potato crops. It is characterized by producing black spots and wilting on plants and fruits; synthetic fungicides are the main tools to control this fungus. The present study aimed to determine under laboratory conditions (in vitro), the antifungal effect of chitosan against the pathogenic strain of A. solani A160, as well as to establish the compatibility between chitosan and the biological control agents Trichoderma asperellum Samuels et al., (strain Ta. 85) and Pseudomonas protegens Ramette et al., (Pf-5). The latter, proposed for the management of early blight of the potato crop in Cuba. The effect of chitosan concentrations (1 and 2%) on the radial mycelial growth of A. solani and T. asperellum and the sporulation of the latter, as well as the number of the latter, was evaluated by the poisoned culture medium technique. colonies of P. protegens. In each experiment, the treatments were compared by analysis of variance and Tukey's test; furthermore, the inhibition percentages were processed according to the proportions comparison test. The results showed that chitosan at the concentrations under study inhibited the mycelial growth of A. solani, with a concentration of 2% standing out. Chitosan at a concentration of 1% showed compatibility with biological control agents in the tests carried out. The results show the possibility of incorporating chitosan with these agents, in the control of A. solani of the potato crop. These will contribute to the preservation of environmental health.

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