Bean (Phaseolus vulgaris L.) is one of the most important crop in Brazilian agriculture. Fungi diseases are among the most restraining production factor. A test was performed aiming to analyze the spraying effect of fungicide based on nozzle type and application volume of a fungicide. The variety carioca FT-Bonito was planted in January/2001 on an experimental plot in Ponta Grossa, State of Paraná. The active ingredient azoxystrobin was sprayed using a pressurized costal spray with CO2. The treatments were composed by two types of nozzles (fan and empty cone) and by two methods of volume determination (manufacturer's recommendation and Leaf Area Index - LAI). The volume for the LAI method was defined by the proportionality with the maximum value of the related index, previously obtained in a greenhouse. The incidence productivity and disease severity were evaluated. The experimental design was plots with random blocks. The average values were compared by Tukey test while group of average values were compared by Scheffé test. The data showed that the treatment with fungicide was necessary for the Campos Gerais area, in the drought season harvest, mainly for the control of the angular leaf spot disease caused by Phaeoisariopsis griseola. Different nozzle types showed no differences when using azoxystrobin. The volume sprayed could be calculated on the culture LAI basis, with economy of up to 69% of the application cost, in the test conditions.
leaf area; severity; productivity
