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Overview of Invasive Organisms

Last Updated November 5, 2024

What is an invasive organism?

An organism that was not originally in the area but came in from other areas through human activities.
Invasive organisms are very familiar to our lives, and it is said that the number of invasive organisms living outdoors in Japan is more than 2,000 species even if they know.
These come in from foreign countries on a daily basis, regardless of intentional or unintentional basis. Among alien organisms imported from abroad, invasive alien organisms that have or may adversely affect ecosystems, human life and body, agriculture, forestry and fisheries, are called "special alien organisms".

What each of us can do

Invasive creature damage prevention 3 principles (outside site) (Ministry of the Environment page)

  1. Do not enter (Do not enter alien organisms that may adversely affect Japan unnecessarily)
  2. Do not throw away (do not throw away your invasive creatures outdoors)
  3. Do not spread (exotic organisms already in the field do not spread to other areas)

Prohibited to prevent the spread of alien organisms (external site) (Ministry of the Environment page)

Frequently Asked Questions

About extermination of specific alien organisms and alien organisms
Basically, you will have to deal with the owner or manager of the land or building.

Invasive creatures in general

・About list of specific alien organisms (outside site) (Ministry of the Environment page)

About invasive creatures in Yokohama

Please refer to the website of the Institute for Environmental Science, Green Environment Bureau.

About Raccoon, Taiwan Squirrel

About the giant daisies

When exterminating, it is common to remove it from the roots, but in order to prevent the spread of seeds, it is also effective to cut the above ground by the beginning of the flowering season when seeds are formed.
Remove the exterminated items in a bag so that the seeds do not spread, expose them to the sun for a few days to die, and then dispose of them as burnable garbage.
Please refer to the website (outside site) of the Ministry of the Environment (Kyushu Regional Environment Office) for details on how to identify and exterminate Okinkeigiku.

About the spider

About fire ant, red cami ant

Please refer to the announcement page about "Fire Ant Aka Cami Ant".

About Argentine ants

  • Unlike fire ants, it is non-toxic and does not stab anyone.
  • It has a strong fertility and damages the ecosystem, such as destroying native ants in Japan. It invades houses and flocks to food, causing discomfort and damaging crops.
  • Native to South America. With the movement of goods, there are cases of intrusion in various parts of the world and in Japan.
  • It nests relatively close to the surface of the ground, and uses gaps such as cracks in concrete and under flowerpots as nests.
  • "How to identify Argentine ants" (outside site)
  • "Specific alien organism Argentine ants" leaflet (outside site)

Inquiries to this page

Green Environment Bureau Park Green Space Department Environmental Activity Business Division

Telephone: 045-671-3448

Telephone: 045-671-3448

Fax: 045-633-9171

Email address: mk-yasei@city.yokohama.jp

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Page ID: 157-689-078

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