An experiment was carried out at UFLA to evaluate the incidence and severity of the brown eye spot caused by Cercospora coffeicola in coffee (Coffea arabica) seedlings, in relation to different dosages of K and Ca in nutrient solution. The experimental design was completely randomized with 16 treatments, three replicates and two plants per replicate. Treatments were displayed in a 4 x 4 factorial scheme, with four levels of K (1, 3, 5 and 7 mmol/l) and four levels of Ca (2, 4, 6 and 8 mmol/l). The seedlings were inoculated, every week, for three months, with a conidial suspension of C. coffeicola of 15,000 conidia/ml. Total leaf area, total number of leaves and total injury number were obtained from seven evaluations made every fortnight. After the final evaluations, coffee seedlings were collected, the injured leaf area and the dry matter weight determined. The K x Ca interaction influenced total injury, total number of leaves and percentage of injured leaf area under the disease progress curve. The dosages of K reduced the total dry matter, the total leaf area and the area under the disease incidence progress curve, while the dosages of Ca influenced the total leaf area and the area under the disease incidence progress curve.
