The EFSA draft scientific report on FOCUS multiyear surface water simulations questioned the use of a pesticide application timer (PAT) in the European risk assessment on surface water exposure.
Currently, a PAT is used to determine actual application dates from a window of intended dates in order to prevent conditions which disagree with agronomical practice.
Ignoring PAT rules could result in unrealistic predicted environmental concentrations (PECsw), for example by considering pesticide applications on rainy days.
In addition, disregarding precipitation patterns might increase the overall variability of simulation results.
Please contact Prakash Srinivasan for further information.
Event: SETAC Europe, Dublin 2020