Invasion information | ||
Range in Japan | Hokkaido, Honshu, Shikoku, and Kyushu. | |
Origin | Unknown. | |
Date | Imported in 1860s | |
Route | Deliberate: As pasture grass | |
Impact | Competition with native plants and some crops. Host of insects and fungi. Pollen is an allergen for hay fever. Native organism(s) affected: Native plants and crop plants. | |
Regulation in Japan | No action for prevention, mitigation, control, or eradication. | |
Introduced range in other countries | Africa, Asia, North and Latin America, and Oceania. |
Reference | Notes |
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100 of the Japan’s Worst Invasive Alien Species |