This site only describes biological pesticides for ornamental and vegetable gardens; non-biological and industrial crop protection methods (agriculture) are not taken into account.

Overview of biological pesticides
With a healthy soil (so a lot of soil life) diseases and fungi stay away (so ensure good acidity, sufficient organic matter, good structure, etc.). Many diseases can also be prevented with antagonistic micro-organisms that suppress the harmful bacteria/fungus.

In the biological control of plant diseases, use is made of antagonists: fungi or bacteria that are used to prevent infection by pathogenic bacteria and fungi. Antagonists colonize plants, which means that disease-causing organisms no longer have a hold on these plants.

You will find both the classic and biological pesticides in the Plants and Pests overview (Control/prevention) .

St. John's wort with leaf beetles, photo: PlantEnPlagen