Invasive plants have an impact on native species and unless these factors are properly understood, it is difficult to predict what sort of impact invasive plants will have.
Invasive frogs can have a major impact on the environment. Some move continents by human trade or travel. But determining how to control them can lead to policies that limit their spread and effects.
Regulating species in South Africa is difficult. But identifying those creating the greatest tension, would shift focus on the most destructive species.
Developing countries have been slow to react to the alien species problem. Its impact can be massively reduced if policies are developed to deal with the issue.
Many alien plants and animals have been introduced to Africa from other regions and spread from country to country, often having devastating effects.