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The Most Damaging Invasive Species in the World

Updated May 28, 2019 8.4k votes 631 voters 23.2k views102 items

List RulesVote up the things that you believe are the most damaging invasives through direct or indirect experience.

Ecosystems on our planet are, as we have learned over and over as a species that seems to live outside them, much more fragile than we've given them credit for. Sometimes it only takes the introduction of one species to upend the whole boat. This can happen naturally... say a flood or a windstorm blows an invader into a new biome that is not prepared for it... but it is usually humans that are responsible for bringing these invaders in. Sometimes it is by accident, and other times we do it to solve a problem that we, ourselves, have created; then going on to make it so much worse. Insects and viruses can be carried across oceans by boats, on livestock or even our clothing. Animals can be imported as pets and then let loose... or imported as a possible resource, and then found to be deeply destructive and impossible to control. Island ecosystems are deeply vulnerable, often having completely endemic, carefully balanced food chains and interspecies relationships. The introduction of a single new animal can, and has, completely upended that balance. Large-scale agriculture is also vulnerable to a single invader that it has no defense against. We can struggle to right these human-caused wrongs, but often find ourselves helpless in the face of an imbalance we have no way to fight. This is a list of the most destructive invasive plants, animals and diseases on Earth. Vote up the ones that you have experienced the impacts of, either directly or indirectly.

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  • Kudzu
    Photo: reallyboring / flickr / CC-BY-NC-ND 2.0
    1

    Kudzu

    Origin: Japan

    Going by several not-so-flattering nicknames, Kudzu is well known to areas that is is not native to. It's hard to miss, as it covers everything. The Kudzu vine is native to Japan, but arrived in the US in 1876 when it was featured at an expo as a hardy, fast growing vine that could fight soil erosion. Well. They weren't wrong about that part. Also known as the 'mile a minute' vine and the 'the vine that ate the south', Kudzu has been spreading across the country at 150,000 acres a year. In the right conditions, a length of vine can grow a foot in a single DAY. The vines themselves grow up to 100ft long and the plant can smother trees, houses, power lines and whatever else that can't move out of the way. It is drought and frost tolerant and practically unstoppable. Nothing can compete with it, and thus, it wins. This invasive easily sits in the top 10 of the worst case scenarios that happen when an organism has no natural barriers built into its ecosystem.

    311
    77
    Too invasive?
  • Red imported fire ant
    Photo: Metaweb (FB) / Public domain
    2

    Red imported fire ant

    Origin: Brazil and Argentina

    Originating in Argentina and Brazil, there are few that have never heard of the fire ant, one of the worst invasives in the world. In the US, it is thought that the first ant arrived in Mobile, Alabama via cargo ship somewhere between 1933 and 1945. In Australia it is believed to be closer to 2011. It has since caused billions of dollars in damage to the areas it now infests. The ants thrive in urban areas, so their presence may deter outdoor activities, but more damagingly, nests can be built under structures such as pavements and foundations, which may cause structural problems, or cause them to collapse. They also can damage equipment and infrastructure and impact business, land, and property values. As the workers are attracted to electricity, they can swarm electrical equipment and destroy it. In agriculture, they can damage crops, damage machinery, and threaten pastures. They are known to invade a wide variety of crops, and mounds built on farmland may prevent harvesting. They also pose a threat to animals and livestock, capable of inflicting serious injury or killing them, especially weak or sick animals. So far, the only ways of controlling these ants has been found to be baiting and pesticides. Due to its capability for damage, the ant has become one of the most studied insects on earth.

    271
    70
    Too invasive?
  • Brown Marmorated Stink Bug
    Photo: Anita363 / flickr / CC-BY-NC 2.0
    3

    Brown Marmorated Stink Bug

    Origin: China

    This damaging and hard-to-eradicate insect is believed to have first arrived in the US in packing crates or on machinery shipped from China. The first documented specimen was collected in Allentown, Pennsylvania, in September, 1998.  Not only does it smell bad - hence the name - but it has the ability to eat its way through a variety of crops, from cotton to apple. It has an uncanny and unfortunate ability to avoid pesticides. Once introduced to an area, this pest can take years to build up enough population to destroy an entire crop... somewhere between 8 and 10 years depending on the local climate and situation. Once established, however, the numbers can explode and new populations can spread, partly because the climate of the US is paradise for the stink bug. In fact, there does not appear to be any environmental limiting factors that are slowing their spread across the United States. They also are extremely mobile insects capable of moving from host to host without causing disruption in their reproductive processes. Currently it is estimated that BMSB populations will continue to grow and spread to other states, especially during unusual periods of warm weather.

    188
    32
    Too invasive?
  • Zebra Mussel
    Photo: Todd Moon / flickr / CC-BY-NC 2.0
    4

    Zebra Mussel

    Origin: E. Europe and W. Russia

    Another ballast water hitch-hiker, the fingernail sized Zebra mussel arrived from Europe in 1988 and established a colony in the great lake region. They soon spread their way through the lakes, down the Mississippi and throughout the eastern US. Ravenous filter feeders, they rapidly deplete the water of food, out-competing the native organisms. They cluster by the millions, clinging to every solid surface. They create a costly problem for power plants, cities and residents when they clog water intakes. They kill native mussels and they slice open the unsuspecting feet of any swimmer or pet that steps on them. There has yet to be found an efficient way to control them, but researchers have tried special paint that keeps them from adhering to docks and pipes. There has been some experimentation with ion emitters that the mussels seem not to like, but for the most part nothing has worked yet.

    226
    53
    Too invasive?