Annual ragweed (Ambrosia artemisiifolia) does not fall into the group of typical quarantine organisms since it is primarily targeted because of its high allergy-causing potential. As a weed it is an invasive neophyte infesting mostly arable crops in certain regions and displacing native flora in natural biotopes. Ragweed might well be present in all the municipalities of Switzerland, albeit at low densities. This is why ragweed's health risk potential to humans is still believed to be manageable. The official policy is to combat ragweed in home gardens, public parks and greens, on roadsides, in natural environments and agriculture. The farming communities are supposed to contain the spread of ragweed so as to avoid biological contamination through agriculture. Cantonal plant protection services are in charge of monitoring and controlling ragweed.
One of the most important pathways of its spread is through contaminated bird seeds. It has therefore been stipulated that they be free of ragweed seeds.
There are no special trade regulations with the EU, nor within the EU.