Poster: Epidemiology: Cropping Systems/Sustainability
Spatio-temporal brown eye spot progress of irrigated coffee by central pivot
M. SILVA (1), M. Silva (2), E. Pozza (2), E. Chaves (3), G. Vasco (2), P. Paula (3), G. Dornelas (3), M. Silva (3), M. Resende (3) (1) UFLA, Brazil; (2) Lavras Federal University, UFLA, Brazil; (3) Lavras Federal University, UFLA, Brazil
The brown eye spot of coffee (Cercospora coffeicola), reduces both productivity and quality of the beverage. Thus, the objective was to evaluate the spatio-temporal disease progress in coffee farm irrigated by center pivot. The pivot area, located in the southern state of Minas Gerais in Brazil, was georeferenced with 50 points in 17 ha to proceed the geostatistical analysis. The disease incidence was evaluated in 60 leaves, in five plants/point at 60-days intervals, from August 2012 to December 2014, totaling 15 evaluations. Climatic variables were obtained by weather station installed in the area and the data were correlated with disease incidence. The production of the years 2013 and 2014 were correlated with the area under the incidence progress curve (AUIPC). The disease progress curves were plotted and the adjustment of semivariogram models was done. Then, the data were interpolated by ordinary kriging, and the maps of disease were constructed (ArcGIS 9.2®). The incidence reaching in August 2013 and 2014, 23 and 21%, respectively. The exponential model was adjusted to the semivariogram. In over 50% of the area, the intensity was high, exceeding 20%, with spatial gradient. There was negative correlation between incidence of the disease with minimum and medium temperatures and AUIPC and productivity in 2014.