GUIDELINE ON DESIGN AND ANALYSIS OF EFFICACY EVALUATION TRIALS

This guideline is intended to provide general background information on the design and analysis of efficacy evaluation trials. The EPPO Guidelines for Efficacy Evaluation of Plant Protection Products provide more detailed instructions on such trials for individual host/pest combinations. The set-up of a trial is first considered (experimental design, lay-out of plots, use and location of untreated controls). The nature of the data obtained from the trial is then reviewed (principles for assessing the effects of products). Finally, suggestions are made on the statistical analysis of trial results. Appendix I gives examples of scales used in the EPPO guidelines.