Noxious weed
Published Time：2010-01-11 10:58:31
Noxious weeds are plant species that have been designated by state or national agricultural authorities as plants that are injurious to agricultural and/or horticultural crops and/or humans and livestock. Most have been introduced in to a foreign ecosystem either by accident or mismanagement, but some are also native species. Typically they are plants that are aggressive growing which multiply quickly and adversely affect desirable plants or are somehow injurious to livestock or humans either by contact or when ingested. They are a massive problem in plenty of parts of the world, greatly affecting areas of agriculture, forest management and other open lands.
Criteria
Plenty of noxious weeds have come to the United States through shipments of preferred seeds; some were introduced purposefully for garden plants. Idaho has about 300 exotic species present within the state. But only 36 of those types are thought about noxious weeds. In Idaho, the director of the Idaho State Department of Agriculture makes the legal designation of noxious on a type of weed. There are three criteria that the department uses for designation of a noxious weed:
It must be present in but not native to Idaho.
It must be potentially more harmful than beneficial to Idaho.
Eradication must be economically and physically feasible.
The potential adverse impact of the weed must exceed the cost of control.1
Types
In Idaho, There are plenty of types of noxious weeds that are poisonous to livestock. Grazing areas and open fields are susceptible to these weeds. Plenty of the weeds that are on the Idaho noxious weed list are that.
Leafy Spurge: came to the United States from Eurasia. This weed has milky latex in all of the plant; this can produce blisters and dermatitis in humans, cattle, and horses and may cause permanent blindness if rubbed in to the eye.
Poison Hemlock: is native to Europe. It contains highly poisonous alkaloids toxic to all classes of livestock.
Russian Knapweed: invades from the Caucasus in southern Russia and Asia. This weed causes chewing in horses.
Tansy Ragwort: is originally from Eurasian. All parts are poisonous, it causes liver destroy to cattle and horses, while affects sheep to a lesser extent.
Toothed Spurge: is native to the Great Plains region. Milky latex exists in all parts of the plant that can produce blisters and dermatitis in humans, cattle, and horses. This weed may cause permanent blindness if rubbed in to the eye.
Yellow Star thistle: originated in the Merriment area and Asia. It causes death and chewing in horses.
Yellow toadflax: was brought from Europe, contains a poisonous glycoside that may be harmful to livestock.
Protecting livestock is important, plenty of livestock can be lost if the wrong weeds are in grazing fields (Prather, 27, 45, 53, 67-73)...2
Control
Avoid driving in noxious weed-infested areas.
Don't transport plants that you cannot identify
If you find noxious weeds with flowers of seeds, pull them out and leave them to dry out, or place in a plastic bag and throw them away
Use certified weed-free seeds
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The article comes from: Noxious weed
