In order to characterize the citrus orchard ecosystems of the western region of Santa Catarina state in relation to the Cicadellidae species, faunistic analysis was carried out in Chapecó from August to July 2005. To characterize the leafhopper population of this municipality, the abundance index, constancy, dominance and frequency were analyzed. The survey was made using yellow tray traps. Dilobopterus costalimai, Acrogonia citrina and Scopogonalia subolivacea were the most abundant, constant, frequent and dominant species, and were therefore considered as predominant. Dilobopterus costalimai had two population peaks, one in August and another in December-January. Acrogonia citrina had two population peaks, one in August and another in January-February. In contrast, S. subolivacea presented only a single population peak in period December-January.