Currently, few biocontrol products are used. These products often have good efficacy in the lab but this is not always validated in the field. Furthermore, the number of biofungicides and biocontrol tools available on the market is far and few between. The objective of this project is, therefore, to promote the use of biocontrol products in the cross-border region to fight in a more sustainable manner against diseases in agriculture. The field of biocontrol against plant diseases is not well studied and, as a result, knowledge on this topic has not progressed sufficiently in recent years. In this project, we propose the validation of new biofungicides and biocontrol products on several very important pathosystems in the cross-border region, and to increase the effectiveness of the biocontrol products available on the market by: on the one hand, searching for optimal conditions of application of new and existing biocontrol products; on the other hand, training farmers in the use of biocontrol products.