| Invasion information |
| Range in Japan |
Hookaido, Honshu, Shikoku, Kyushu |
|
| Origin |
Unknown. |
| Date |
The first record was in 1905. |
| Route |
Deliberate: As pasture grass, for some evironmental modification |
| Impact |
Competition with native plants and crop plants. Allelopathy. Host of insects and fungi. Allergen for hay fever. Native organism(s) affected: Native plants and crop plants. |
| Regulation in Japan |
Regulated introduction in Saga Pref. |
| Introduced range in other countries |
Africa, Asia, Oceania, and North and Latin America. |