| Plant tribe | Plant genus | Plant species | Part of plant | Region | Literature | Source |
| Carduoideae | Centaurea | diffusa | Flowerhead (gall) | USA | Merz (1994) | BCA (biological control agent) |
| stoebe | Flowerhead (gall) | Switzerland | Merz (1994) | Breeding - Switzerland | ||
| Flowerhead (gall) | USA | Merz (1994) | BCA (biological control agent) |