Scientists release new allies in the battle against invasive yellow toadflax in the Rocky Mountains

Toadflax
Yellow toadflax in the field (credit Pixabay)

A team of international scientists are collaborating to fight the noxious weed yellow toadflax (Linaria vulgaris) in Montana’s world-famous Rocky Mountains with the help of a tiny insect – the shoot-galling weevil Rhinusa pilosa.

Yellow toadflax, first introduced from Wales in the late 1600s as an ornamental and medicinal plant and to make textile dyes, is an aggressive invader listed as a noxious weed in more than 10 US states (including North and South Dakota, Colorado, Nevada, New Mexico, Oregon and Idaho) – which suppresses desirable vegetation through intense competition for limited soil moisture.

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