Summary:
The cabbage root fly (Delia radicum) overwinters as a pupa, in diapause. The first generation of adult flies emerges in the spring and mated female flies lay their eggs in the soil close to the base of brassica plants. The model simulates the development of cohorts of 500 individuals through adult emergence, egg laying and hatching. For each stage, the percentage development is calculated each day by integrating the appropriate development rate curve.