Linear Model fit to estimate base temperature and degree days for development of an insect life stage
Insect development is temperature driven. For each life stage it is possible that a base temperature exists below which developmental rate is zero or no development occurs. The usual practice is to calculate the development duration in days for each life stage such as egg period, larval and pupal period. However, the duration of a stage depends on the temperature to which it is exposed and hence the duration is better estimated by taking into account the heat units accumulated. This is known as Thermal Constant (degree days) for completing a life stage. The base temperature and thermal constant are estimated by recording development duration of different life stages of an insect at different constant temperatures between 15 and 35oC. To this data, a linear model is fitted to estimate the base temperature and degree days required.
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