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Johnson grass that is resistant to the common herbicide glyphosate has been found in Argentina and the United States. [2] [3] [4] It is considered to be one of the ten worst weeds in the world. [5] In the United States, Johnson grass is listed as either a noxious or quarantined weed in 19 states. [6]
Parthenium hysterophorus is a species of flowering plant in the family Asteraceae. It is native to the American tropics. [1] Common names include Santa-Maria, [2] Santa Maria feverfew, [3] whitetop weed, [4] and famine weed. [5] In India, it is locally known as carrot grass, congress grass [6] or gajar ghas or dhanura. [7]
The concept of weeds also overlaps with the concept of invasive species, both in the sense that human activities tend to introduce weeds outside their native range, and that an introduced species may be considered a weed. Many weed species have moved out of their natural geographic ranges and spread around the world in tandem with human ...
Panicum capillare, known by the common name witchgrass, [1] is a species of grass. It is a native plant to most of North America from the East Coast through all of the West Coast and California. It can be found as an introduced species in Eurasia, and as a weed in gardens and landscaped areas. [2] It grows in many types of habitat.
Setaria pumila is a species of grass known by many common names, including yellow foxtail, [2] yellow bristle-grass, [3] pigeon grass, and cattail grass. It is native to Europe, but it is known throughout the world as a common weed. It grows in lawns, sidewalks, roadsides, cultivated fields, and many other places. This annual grass grows 20 ...
Farmers consider this grass to be a indicator of poor soil. [9] Andropogon virginicus is referred to as whiskey grass in places where this weed is unwanted. This species often invades open woodlands, grasslands, and forests areas. [10] Where it is invasive, A. virginicus is known to invade plant communities that are extremely deficient in ...