Native plants that could be a threat to local crops or may transmit a disease pest that can be destroyed by domestic plants and plant produce, or could be a direct threat to humans. Bring native plants into causing a change of ecosystem
Exotic plants that may be a threat to local flora. Borne diseases or pests that may be damaging plants and plant products in the country, or possibly a direct threat to humans. These plants are endemic to cause a change in the ecosystem.
Alien plant could be a threat to the local plants. May or may not be the carrier that might come to destroy pests of plants and plant products, domestic, or may be a direct insurance to humans.