Atividade do óleo-resina de Copaifera Reticulata Ducke no crescimento micelial in vitro de fitopatógenos

Abstract

Among the countless vegetable species of the Brazilian flora with medicinal action and that they present chemical substances biologically active, it is the gender Copaifera, where it the Copaifera reticulata Ducke. Described as tends fungicidal properties. Presence of species fungycs pathogens in vegetables is of extreme economical importance, because it results in undesirable reduction in the quality of the vegetable production. Species as Curvularia Sp, Cylindrocladium sp, Macrophomina phaseolina (Tassi) Goid, Pestalotia sp, Phytophthora palmivora (Butler) Butler, Rhizoctonia solani Kúhn, Sclerotium coffeicola, Sclerotium rolfsii Sacc and Thielaviopsis Sp., they cause several diseases in the vegetables. In the attempt of minimizing the synthetic chemical agents' toxic, it is done necessary to find alternatives to decrease or even to inhibit the action cf those pathogens through biological control, using the extracted chemical compositions of the plants. The objective of this work was to evaluate the activity of the oil-resin of C. reticulata Ducke in the growth phitopatogen in vitro. The C. reticulata oil-resin was previously incorporated middle synthetic BDA autoclaving to 120ºC to one atm for 20 min, in the proportions of 0,1%, 0,2%, 0,25%, 0,5% and 0,75% and flowed in: petri plate. The witness just contained middle synthetic BDA. After solidifing of the middle, a disk of 3mm diameter was inserted containing micelial of the phitopatogen in the center of the plate and maintained to 25ºC. The diameter of the colonies was measured in cm in certain intervals from days. The oil-resin of C. reticulata was efficient in the inhibition of ihe growth micelial of phitopatogen studied. R solani, Pestalotia sp, P. palmivora, Curvularia sp, S. rolfsii and S. Coffeicola they were the ones that they presented larger sensibility to the effects of the oil-resin.