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Only three main usage groups could be identified: herbicides (78 distinct pesticides), insecticides (72 distinct pesticides) and fungicides (23 distinct pesticides). The rest of substances were either transformation products/ metabolites (three) or could not be assigned to a specific usage or were multi-use pesticides.

In the PPDB database most of the pesticides are clearly assigned to a specific MoA. As the number of different MoA is very diverse it was decided to further simplify the grouping for easier analysis in this technical report. Thus, all substances which, for example, in one way or another modified nerve signalling or muscle activity (GABA receptors, AChE inhibitors or else) were allocated to the group of ‘neurotoxic compounds’. Similarly, all herbicides which inhibited photosynthesis – even if the exact position of the inhibition might be PS II or protoporphyrinogen oxidase inhibition or another mechanism - were assigned to the group of ‘photosynthesis inhibition’.