Evolution of the black sigatoka (Micosphaerella fijiensis Morelet) of the banana tree (Musa spp.) and biocontrol potential with Trichoderma harzianum rifai, under field conditions in the state of Rio de Janeiro.
incidence of black sigatoka, banana, biological control
Black sigatoka, caused by the fungus Micosphaerella fijiensis Morelet, which can cause losses of up to 100% of the production, has been traditionally controlled by intensive spraying of fungicides, however, the use of these products for their control in the conditions observed in the areas of the object is economically and ecologically unfeasible, considering the costs involved to small farmers in these localities and the relevant environmental impacts caused by this practice. Thus, this work intends to determine the potential of the Trichoderma harzianum Rifai isolate from the outbreaks of disease occurring in banana plantations in some municipalities of the Rio Verde and Rio de Janeiro region of the state of Rio de Janeiro. for the control of black sigatoka in banana plants of the cultivars Prata Anã, Pioneira and Nanicão (Cavendish) under field conditions, and the severity of Black Sigatoka determined on the basis of the methodology proposed by Stover (1977) modified by Gauhl (1993) evaluating the behavior of the Black Sigatoka against the application of the biocontrol agent on the cultivars in the different places of its occurrence. The natural and anthropic information related to the sites of the foci will also be correlated with the purpose of gathering a set of information and also of behavior of the attributes related to the disease, so that the potential of use of this agent for biocontrol of the sigatoka-negra in the state of Rio de Janeiro.