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In the United States, Johnson grass is listed as either a noxious or quarantined weed in 19 states. [6] With Sorghum bicolor it is a parent of Sorghum × almum, a forage crop also considered a weed in places. [7] It is named after an Alabama plantation owner, Colonel William Johnson, who sowed its seeds on river-bottom farm land circa 1840. The ...
Australian Johnson grass virus; Maize dwarf mosaic virus — Kansas I strain; Johnsongrass mosaic virus (JGMV) is a plant pathogenic virus of the family Potyviridae.
Ascochyta sorghi infects grain crops such as sorghum (Sorghum bicolor), Johnson grass (Sorghum halepense), Sudan grass (Sorghum sudanense), and barley (Hordeum vulgare). [1] It can also infect wild sorghum species. [2] Symptoms of rough leaf spot can appear on leaf blades, leaf sheaths, peduncles, stalks, and glumes of susceptible species. [2]
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The grass is often confused with the similar looking Johnson grass (Sorghum halepense), although it is only distantly related. Tridens flavus is easily distinguished by its short, hairy ligule . Native to eastern North America, it is widespread throughout its range and is most often found in man-made habitats, such as hay meadows and lawns.
Johnson grass considered a weed Weed science is a scientific discipline concerned with plants that may be considered weeds , their effects on human activities, and their management [ 1 ] "a branch of applied ecology that attempts to modify the environment against natural evolutionary trends.".
FILE - Detroit Lions offensive coordinator Ben Johnson looks on from the sidelines during the first half of an NFL football game against the Chicago Bears, Dec. 22, 2024, in Chicago.
The most economically important host is corn, but other forms may infect sorghum, Johnson grass, or sudangrass. [2] The most common diagnostic symptom of the disease on corn is cigar-shaped or elliptical necrotic gray-green lesions on the leaves that range from one to seven inches long. [ 3 ]