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A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is harmful to agricultural or horticultural crops, natural habitats or ecosystems, or humans or livestock. Most noxious weeds have been introduced into an ecosystem by ignorance, mismanagement, or ...
All parts of these plants are toxic, due to the presence of alkaloids. Grazing animals, such as sheep and cattle, may be affected and human fatalities have occurred. [106] Delphinium spp. larkspur Ranunculaceae: Contains the alkaloid delsoline. Young plants and seeds are poisonous, causing nausea, muscle twitches, paralysis, and often death.
The damage they do results both from the direct injury they cause to the plants and from the indirect consequences of the fungal, bacterial or viral infections they transmit. Plants have their own defences against these attacks but these may be overwhelmed, especially in habitats where the plants are already stressed, or where the pests have ...
Washington is home to over 140 noxious weeds that can be toxic to humans and damage habitats and wildlife. Noxious weeds are defined as “invasive, non-native plants that threaten agricultural ...
Locoweed (also crazyweed and loco) is a common name in North America for any plant that produces swainsonine, an alkaloid harmful to livestock.Worldwide, swainsonine is produced by a small number of species, most of them in three genera of the flowering plant family Fabaceae: Oxytropis and Astragalus in North America, [1] and Swainsona in Australia.
The invasive giant hogweed plant was just discovered in the state of Virginia for the first time. Giant hogweed sap can make skin extremely sensitive to the sun, causing third-degree burns in a ...
Broiler chickens and turkey poults have slower weight gain when they feed on the beetle. [ 10 ] Like other darkling beetles, this species produces defensive benzoquinone compounds that can be irritating to humans, causing asthma , headaches , rhinitis , conjunctivitis , corneal ulcers , and dermatitis with erythema and papules .
E. plantagineum contains pyrrolizidine alkaloids, so is poisonous to nonruminants. [10] [11] When eaten in large quantities, it causes reduced livestock weight, and death in severe cases, due to liver damage. [7] Paterson's curse can also kill horses, [12] and irritate the udders of dairy cows and the skin of humans.