In the Netherlands, a phonological forecasting model has been developed for the common green capsid bug but it is not generally available.
Work in the Netherlands has suggested that the time to monitor for the third instar nymphs which are most damaging to apples is when daily temperature sums above 4oC accumulated from 1 January amount to 568 2.05*DTs245 where DTs245 indicates the day on which 245 day-degrees is reached