The task of Agroscope’s efficacy experts consists in using the approval dossier to evaluate the suitability and efficacy of PPPs (including living organisms and viruses) to be used in Switzerland to control plant diseases, weeds and pests. This work requires specific knowledge concerning harmful organisms and the quantification of the damage they cause to various crops. In addition to the required efficacy, a PPP must not have any unacceptable effects on the crops or their products. The intended use and application quantity of PPPs and living organisms must be sufficiently optimised for minimal use to achieve maximum effect.