Invasion information |
Range in Japan |
Almost entire Japan including Amami and Okinawa Islands. |
|
Origin |
Unknown. |
Date |
The first record was in ca. 1920, Biwako Lakeside. Recorded since 1940s in Amamioshima, Tokunoshima, and Okinawajima Is. |
Route |
Accidental: Details unknown. |
Impact |
Actually: Competition with native species and crops. Native organism(s) affected: Native grasses, crops, etc. |
Regulation in Japan |
No action for prevention, mitigation, control, or eradication. |
Introduced range in other countries |
South America, Europe, Asia, Oceania |