The document describes the degree-day model, which uses temperature thresholds to estimate insect development rates. It accumulates "degree days" based on daily temperatures between lower and upper thresholds. Each life stage requires a certain number of degree days. By tracking accumulation from a biofix date, the model can predict when a life stage will be reached. It discusses different calculation methods that estimate degree days from minimum and maximum temperatures to approximate real temperatures. The model is useful for predicting sampling times but does not replace scouting.