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Pest Forecasting Systems

The most common pest phenology models are Degree Day Summation, which assume a linear relationship between development rate of an insect and the temperature between upper and lower thresholds. Significant models for modelling the effects of the development of individual insects within a given population deal with mean rate versus temperature relationships and distribution of development times.

Degree day models have long been used as part of decision support systems to help growers predict spray timing or when to begin pest scouting.