Pesticides and herbicides can reduce competition from native species by killing or suppressing their growth, creating opportunities for invasive species to establish and thrive.

Herbicides are specifically designed to kill or control plants, making them the most likely type of pesticide to contribute to the spread of invasive plants.

When pesticides and herbicides are used repeatedly, they create a selective pressure that favors plants with natural or acquired resistance to these chemicals, allowing them to survive and reproduce while susceptible plants are eliminated.

Kudzu, giant hogweed, and Japanese knotweed are all examples of invasive plants that have been able to spread more easily due to the use of herbicides that target native plants but leave these invasive species relatively unaffected.

Invasive species can compete with native species for resources such as food, water, and habitat, leading to population declines and even extinction. They can also alter ecosystem structure and function by changing the composition of plant and animal communities, and they can increase the risk of wildfires by promoting the growth of flammable vegetation.

Invasive species can reduce crop yields by competing with crops for resources and by transmitting diseases. They can also increase healthcare costs by causing allergies and other health problems. Additionally, invasive species can damage infrastructure by blocking waterways, clogging irrigation systems, and undermining foundations.

Biological control involves the introduction of natural enemies of invasive species, such as predators, parasites, or pathogens. Chemical control involves the use of herbicides, pesticides, or other chemicals to kill or suppress invasive species. Mechanical control involves physical methods such as mowing, cutting, or pulling invasive plants.

Ladybugs are natural predators of aphids, Cactoblastis cactorum is a moth whose larvae feed on prickly pear cactus, and myxomatosis virus is a disease that can be fatal to rabbits. All of these biological control agents have been used successfully to manage invasive species.

Invasive species are often able to adapt to new environments quickly, making them difficult to control. Additionally, it can be difficult to distinguish between invasive and native species, especially when they are closely related. Finally, there is a lack of effective management strategies for many invasive species, making it challenging to prevent their spread.

Individuals can play a role in preventing the spread of invasive species by avoiding the use of invasive plants in landscaping, cleaning boats and equipment before moving between water bodies, and reporting sightings of invasive species to local authorities.