Temperature-dependent development of strawberry root weevil, Otiorhynchus ovatus (L.), pupae was studied in strawberry (Fragaria × ananassa Duch. variety ‘Totem’). The development of pupae was investigated at constant temperatures from 3 to 33°C at 3°C intervals. The upper thermal lethal limit for strawberry root weevil pupae was between 30 and 33°C. Pupae did not eclose below 6°C. Pupal duration was 127 d at 6°C and 7 d at 30°C. Rate of development (1/d) was greatest at 30°C. We used the development of strawberry root weevil as a model system to suggest a modification on the traditional method of creating linear degree-day models. This method used weighted regression and was based on the assumption that the purpose of creating prediction models is to model the development of insects based on the temperatures to which they are exposed in the field. The predictive ability of this weighted model was compared with a traditional nonweighted linear degree-day model by relating predictions to the observed occurrence of strawberry root weevil lifestages determined by field sampling. The weighted linear pupal prediction model produced a developmental threshold of 4.3°C and a degree-day requirement of 227.3. The nonweighted linear pupal prediction model produced a developmental threshold of 6.2°C and a degree-day requirement of 163.9. Using a weighting method maintains the utility of a linear model while allowing for more accurate estimate of the lower developmental threshold.
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