Invasion information | ||
Range in Japan | Hokkaido, Honshu, and Shikoku Is. Especially spread in Hokkaido, including several small islands such as Rishiri, Rebun, Teuri, Yaghisiri, and Toshimaoshima Is. | |
Origin | North America | |
Date | The first redord was in 1960s, at Hokkaido. | |
Route | Accidental: With grains or pasture. | |
Impact | Actually: Competition with native species, crops, pasture, etc. Harmful for the spines on stems and leaves. Potentially: Parasite (viruses, insects such as Colorado potato beetle Leptinotarsa decemlineata) Native organism(s) affected: Native grasses, crops, pasture, etc. | |
Regulation in Japan | Import of stems and leaves of genus Cirsius from the countries and regions with Colorado Potato beetle Leptinotarsa decemlineata to Japan is prohibited by the Plant Protection Law. | |
Introduced range in other countries | Asia, Africa, North and South America, Oceania. |
Reference | Notes |
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