Influência do zinco na incidência de doenças do cafeeiro

Abstract

The are few studies have been done related to the increase or decrease of disease resistance in coffee plants, with alteration from plant nutrient levels. The ain of this work was to verify the effect of zinc sulfate, applied either alone or in association with fungicides, and the effect of potassium chloride on coffee leaf rust, brown-eyes and leaf stains in coffee plants. Copper oxichloride, tebuconazole, sulfate of zinc + potassium chloride and sulfate of zinc were applied on plots and concentrations of zinc sulfate (0,0 %, 0,3 %, 0,6 % and 1,2 %) were applied on sub plot. Treatments with copper and tebuconazole reduced the incidence and severity of rust, the incidence of brown-eyes and stains leaf (phoma and ascochyta) and the defoliate independent of the zinc sulfate concentrations. Concentration of zinc sulfate varying from 0,6 % to 0,75 % shawed less rust severity. As the concentration of zinc sulfate increased, the severity of brown-eyes disease, leaf stains (phoma and ascochyta) and coffee defoliate tree also increased.