Ação do óleo essencial de menta (Mentha arvensis) sobre o patógeno Lasiodiplodia theobromae em cachos de videira cv. Itália

ABSTRACT The presence of Lasiodiplodia theobromae (dry rot) on the vine, in irrigated areas of the Brazilian semi-arid region, has been very aggressive, infecting several plant parts. Essential oils show efficient disease control, both for their fungitoxic action, which inhibits mycelial growth and spore germination, and for the presence of elicitor compounds. Thus, this study aimed to obtain L. theobromae control by using the oil from mint ( Mentha arvensis ). The mycelial growth of L. theobromae was analyzed on Petri plates containing potato-dextrose-agar medium supplemented with the essential oil at the following concentrations: 0; 0.25; 0.5; 1.0; 1.5; 2.0% of mint oil. To evaluate the direct effect of the essential oil on the disease development, the grape bunches were inoculated with the pathogen and, after 4 h, sprayed with solutions containing Peixinho, G.S.; Ribeiro, V.G.; Amorim, E.P.R. Action of the essential oil of mint ( Mentha arvensis ) on the pathogen Lasiodiplodia theobromae