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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 ...
The roots of most broadleaf weeds are fibrous in nature. The roots can be thin, a large taproot, or a combination. Many broadleaf weeds spread through their seeds and rhizomes, although some only spread through seeds. [2] Popular broadleaf weeds are chickweed, clover, dandelion, wild geranium, ivy, milkweed, plantain (broadleaf), and thistle. [4]
Alternanthera is a genus of flowering plants in the family Amaranthaceae. It is a widespread genus with most species occurring in the tropical Americas, [2] [3] and others in Asia, Africa, and Australia. [3] Plants of the genus may be known generally as joyweeds, or Joseph's coat. [4] Several species are notorious noxious weeds. [5]
Tall waterhemp is a summer annual that produces a large number [quantify] of very small [quantify] seeds. It is considered an r-strategist. Emergence can span several months and often occurs later in the season than other annual weeds, allowing the weed to evade typical weed control strategies such as herbicide application and tillage. [8]
Linaria dalmatica is listed as a noxious weed in fourteen U.S. states and three provinces in Canada. [6] [8] [9] However, it is present in thirty-one U.S. states and ten provinces and two territories in Canada. It is a grassland invader native to the Mediterranean region, and it was introduced to North America in the late 1800s.
Cogongrass, one of the 10 worst weeds in the world, was recently identified in Idaho’s Foothills. This is the first case of cogongrass in the western United States An aggressive weed infesting ...
Nebraska is noted for the presence of feral hemp plants, low in psychoactive THC and generally known as "ditch weed" (or more rarely "Nebraska Nonsense"). [18] A 1987 study noted that 12.4 million cannabis plants were eradicated in Nebraska annually. [19]
Solanum elaeagnifolium, the silverleaf nightshade [1] or silver-leaved nightshade, is a species of plant in the nightshade family native to North and South America. It is common in parts of southwestern USA, and sometimes weed of western North America.