Antifungal activity against Alternaria solani and control of early blight in tomato by essential oil of citronella

The objective of work was to evaluate the antifungal activity, the early blight control, and the enzymatic defense in tomato treated with citronella essential oil. The aim of this work was to evaluate the antifungal activity, the early blight control, and the activation of defense enzymes peroxidase, polyphenoloxidase, and phenylalanine ammonia-lyase in tomato leaves treated with citronella essential oil. At the end of the mycelial growth evaluation, the sporulation of the fungus was assessed. [...]10 mL of deionized water was added to each Petri dish, and after scraping the colony with a glass slide, the suspension was filtered through gauze, and the number of spores per mL was determined in a Neubauer chamber. Statistical analysis The data obtained were subjected to analysis of variance and, when significant, submitted to regression analysis with a 5% probability of error for essential oil concentrations.