Descriptive statistics of (red) biological control agent families, (blue) biological control target families, and (green) plant groups. Upper row: Relative abundance of A agent and D target families, and G crops represented in introductions for biological control against insects in the analysed area (Europe, North Africa, and the Middle East). Middle row: Relationship between the relative abundance of B agents E targets, and H crops in all introductions and successful complete control of the target. Lower row: Relationship between the percentage of agent establishment and the percentage of partial to complete control (impact) of the target for the most abundant C agent and F target families, and I crops. Repeated introductions of agent-target combinations are not considered.