Efeito do manejo cultural e químico na incidência e severidade da mancha-preta dos citros

the citrus plants has several phytosanitary problems, including citrus black spot (guignardia citricarpa). control of this disease is based on cultural practices and application of fungicides. the effect of the weed management and chemical control was evaluated. the experiments were carried out in sweet orange orchards in mat？o, rio claro and mogi gua？u municipalities in the state of s？o paulo, brazil. in the experiment of weed management, the use of ecological brushcutter was compared with the use of mechanical rake and brush combined, at 35 days after 2/3 of petals fallen. chemical control was carried out by two spraying of protective fungicide and from 2 to 5 spraying of systemic and protective fungicides 45 days after 2/3 of petals fallen. the range of these spraying was 35 days and in all of them emulsifiable mineral oil (0.25%) was added. the area under the curve of the incidence progress and severity of the disease was evaluated using data from five evaluations that were realized every 15 days from the physiological maturity of the fruits. the use of chemical control associated with weed management decreased the intensity of the disease in all areas evaluated.