Noxious weed, a plant designated by the government as injurious to public health, agriculture, recreation, wildlife or property
The federal government defines noxious weeds under the Federal Noxious Weed Act of 1974.
weed | Thurlow Weed | Weed | noxious | Federal Noxious Weed Act of 1974 | The Sot-Weed Factor | Tad Weed | Larry-Boy and the Rumor Weed | Noxious weed | noxious weed | Noxious stimulus | Ella Weed | Bobby Weed | Al Weed | Abner Weed |
The genus's most infamous species is R. conicus which is a controversial agent of biological pest control which has been used against noxious thistles in the genera Carduus, Cirsium, Onopordum, and Silybum.
In most of these countries, these thistles are considered noxious weeds, especially in Australia where a biological control program has been set up (using the Rosette Crown Weevil, Trichosirocalus briesei).
Veronica arvensis, the corn speedwell, common speedwell, speedwell, rock Speedwell, wall Speedwell, a medicinal plant species and a noxious weed