We must limit the spread of IAS plants, by applying specialised measures, in accordance with the biological and ecological characteristics of each species! There are a few main methods, which show some success in the fight against IAS: mechanical, ecological, chemical, and biological. It is best to apply a combination of measures, according to the specific conditions and with the active participation of all interested parties.
Improper eradication of IAS trees and shrubs just exacerbates the problem. When they are cut down or burned IAS plants form an abundance of root offshoots, leading to even more overgrowth. There are dormant seeds in the soil and the destruction of mature shrubs and trees illuminates the ground, stimulating the formation of a large number of new plants.
Herbicide treatment can be successful, however the type and quantity must be precisely determined by an expert, in order to avoid soil and water contamination and the destruction of native plants and animals.
A consistent and tenacious fight until complete eradication of the treated groups must be performed in the course of several years. Each remaining stalk gives an opportunity for the root system to recover and create new offshoots.
The most certain way to protect against IAS is to not allow their entry in the first place and to react immediately, upon the first appearance of new plants. Limiting distribution is the main approach toward fighting invasive alien plants. This can happen only with the support of local communities, living in close proximity to the protected areas and Natura 2000 habitats and everyone with vested interest and responsibilities, connected to them.
Three of the most aggressive invasive tree and shrub species in Bulgaria are ailanthus, false acacia and desert false indigo. They are included in the list of the most dangerous invasive, alien species, threatening Europe’s biodiversity, as well as in the list of the European and Mediterranean Plant Protection Organisation.