Quo vadis biological control? A closer look at biostimulants, antagonists, strengtheners and efficiant ingredients

Antagonists, such as beneficial insects, naturally occurring bacteria, fungi, viruses, nematodes or plant essences are used to protect plants against diseases and pests. Often the mechanisms, why a substance or method works are not yet fully understood. This leads to problems, when having to legally classify them as plant protection product, enhacer or biostimulant.