We estimated mortality rates of eggs, larvae and pupae as a function of temperature on the basis of data on the survival rates presented in [21] . To estimate, for instance, the mortality rate of eggs we used the following procedure: let s 19 T be the survival rates of eggs (19 days after oviposition) for temperatures T [ T ? , as reported in [21] . For a fixed value of temperatureT T, the following differential equation system describes the transition from eggs to larvae: