This study, which aims to predict the outbreaks of sunn pest; was carried out in two overwintering sites for six life cycles in 2013-2019. Three critical periods in each life cycle during the study; at the beginning of the estivation, hibernation and active life periods, the densities of the overwintering population, the fat ratios, weights, and the relationships between them were determined. It has been determined that the winter population of sunn pest varies in terms of both weight and fat depending on gender, life cycles and critical periods, and there is a positive relationship between body mass and fat ratios. Lipids ratio is an important indicator that we can use in estimates of sunn pest epidemic with appropriate climatic conditions and nutrient abundance. Especially in female individuals 27% and above, suitable for climatic conditions during active life; It has been demonstrated that in conditions where there is high temperature, low proportion humidity, wind speed and precipitation and proper nutrient abundance for 2 consecutive years, there is a significant increase in population size and pest can cause an epidemic.