Impacts on living beings
Allelopathy – releases substances into the soil which prevent the germination of other species.
Competition – it is considered a relatively weak competitor, but in disturbed habitats and under favourable germination and growth conditions it establishes itself as a single culture and completely displaces other species.
Herbivores – it is food for many animals, mostly insects. However, many of these insects are crop parasites and therefore not suitable for controlling ragweed. Nevertheless, North American beetles of the genus Ophraella are particularly interesting as they are thought to be usable in the biological control of ragweed.
Within its natural range it is used in medicine. Its juices are used to stop local bleeding and to treat indigestion. However, it should be emphasized that the damage it inflicts is far greater than the potential benefits that have not even been sufficiently researched. For example, available data from neighbouring Hungary show that ragweed was present on about 418,000 hectares in 1990, 2.9 million hectares in 2001, and in 2008 ragweed could be found on 5 million hectares out of a total of 6.2 million hectares of agricultural land in Hungary. The economic damage it causes in Hungary is estimated at around EUR 100 million.
One hectare covered with ragweed annually produces about 66 kg of pollen per vegetation season.
Negative impacts on biodiversity:
Significantly slows down the regeneration of natural habitats.Threatens rare plant species and many natural plant communities that grow in the same habitats.
How to remove it?
When ragweed is found in small areas, it is recommended to pluck whole plants before they can produce seeds. In organic farming, one should undertake every effort to sow the plants so that they germinate at least 10 days before ragweed. On large areas, methods that are considered good are using herbicides or ploughing to a minimum depth of 10 cm.