Phenological model of pear psylla Cacopsylla pyri

A phenological model of first‐ and second‐generation pear psylla, Cacopsylla pyri L. (Homoptera: Psyllidae), was developed. The model included a time‐distributed delay and was based on authors’ observations and literature data of termination of reproductive diapause, oviposition‐period length, and developmental duration of juvenile stages depending on temperature. After calibrating microclimate, the model provided a good simulation of observations from different orchards in Switzerland and Italy over several years. The model or simulated output tables can be used to improve timing of monitoring and control measures.