Harmonized dose expression for the zonal evaluation
of plant protection products in high growing crops

 

The EPPO Standard PP 1/239 Dose expression for plant protection products  states that ‘per treated leaf wall area (LWA) unit’ is becoming a common dose expression method in three-dimensional crops. The GEP certified trial reports which conform to EPPO Standards already contain all relevant information allowing calculation from the applied dose to the LWA. However, the need for a harmonized approach to evaluate and interpret data and information given in trial reports has become increasingly important following the implementation of the EC Regulation 1107/2009, including zonal assessments of Plant Protection Products. In 2016, the EPPO Workshop on harmonized dose expression for the zonal evaluation of plant protection products in high growing crops (Vienna, 2016-10-18/20) provided an excellent opportunity to share experiences and discuss difficulties related to dose expression in the framework of zonal evaluation and mutual recognition.

 

 

 

 

 

Following one of the recommendations expressed at the Workshop, an ad hoc Expert Working Group (EWG) has been established to work on a Glossary of terms and on a Guide for measurement of crop parameters. Representatives of regulatory authorities and the industry worked together in the EWG to finalize the two documents which have been approved by the EPPO Working Party on Plant Protection Products at its meeting in 2018. The Working Party decided to make available the two documents and that a revision of EPPO Standard PP 1/239 Dose expression for plant protection products should be undertaken by the EPPO Panel on General Standards for Efficacy Evaluation. The revision will be to align the text of the Standard with the content of the Glossary and the Guide. These two documents will also be considered for inclusion as appendices of or supplementary information for the revised Standard.