Erigeron annuus

Basic information
Scientific name	Erigeron annuus	Click to magnify
Major synonym	Stenactis annuus
Common names	Annual fleabane, Sweet scabious
Higher taxon	Asteraceae, Asterales, Magnoliopsida, Magnoliophyta
Natural range	North America.
Habitat	Farm area, fruit garden, pasture field, roadside, vacancy, grassland, etc.

Invasion information
Range in Japan	Almost entire Japan
Origin	Unknown.
Date	ca. 1865
Route	Deliberate: As ornamental plant
Impact	Actually: Competition with native plants, crops, pasture, etc. Allelopathy, Parasite (insects, fungi, nematodes, viruses) Native organism(s) affected: Native grasses (Mt. Kiraigamine, Yatsugatake, Oze, Senjogahara, etc.), crops, pasture, etc.
Regulation in Japan	No action for prevention, mitigation, control, or eradication.
Introduced range in other countries	Europe, Asia

Reference

Notes

Jpn Assoc Advanc Phyto-Regul & Inst Contr Agrochem, Minist Agr, China (2000) Chinese Colored Weed Illustrated Book. Zenkoku-Noson-Kyoiku-Kyokai, Tokyo
Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Osaka (in Jpn)
Satake et al. (1981) Wild Flowers of Japan, Herbaceous Plants [III]. Heibonsha, Tokyo (in Jpn)
Shimizu (ed) (2003) Naturalized Plants of Japan. Heibonsha, Tokyo (in Jpn)

100 of the Japan’s Worst Invasive Alien Species