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Crop Weed
Crop weeds are weeds that grow amongst crops. Despite the potential for some crop weeds to be used as a food source, many can also prove harmful to crops, both directly and indirectly. Crop weeds can inhibit the growth of crops, contaminate harvested crops and often spread rapidly. They can also host crop pests such as aphids, fungal rots and viruses. Cost increases and yield losses occur as a result. ''Striga'', one of the main cereal crop weeds in Sub-Saharan Africa, commonly causes yield losses of 40–100% and accounts for around $7 billion in losses annually. Around 100 million hectares of land in Sub-Saharan Africa are affected by ''striga''. Barnyard grass has been identified as a culprit in global rice yield losses and certain species have been known to Vavilovian mimicry, mimic rice. Examples of crop weeds include chickweed, barnyard grass, dandelion, ''striga'' and ''Reynoutria japonica, Japanese knotweed''. A less commonly known crop weed is Abelmoschus ficulneus. See ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinochloa Crusgalli Habit3 - Flickr - Macleay Grass Man
''Echinochloa'' is a very widespread genus of plants in the Poaceae, grass family and tribe Paniceae. Some of the species are known by the common names barnyard grass or cockspur grass. Some of the species within this genus are millets that are grown as cereal or fodder crops. The most notable of these are Echinochloa esculenta, Japanese millet (''E. esculenta'') in East Asia, Echinochloa frumentacea, Indian barnyard millet (''E. frumentacea'') in South Asia, and Echinochloa stagnina, burgu millet (''E. stagnina'') in West Africa. Collectively, the members of this genus are called barnyard grasses (though this may also refer to ''Echinochloa crus-galli, E. crus-galli'' specifically), and are also known as barnyard millets or billion-dollar grasses. When not grown on purpose, these grasses may become a nuisance to farmers. In particular, echinochloa crus-galli, common barnyard grass (''E. crus-galli'') is notorious as a weed. It is not easily suppressed with living mulches such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chickweed
''Stellaria media'', chickweed, is an annual flowering plant in the family Caryophyllaceae. It is native to Eurasia and naturalized throughout the world, where it is a weed of waste ground, farmland and gardens. It is sometimes grown as a salad crop or for poultry consumption. Description Chickweed is a hardy annual which flowers throughout the year in northern Europe, in mild weather. The stems are terete and glabrous with a lax and sprawling growth habit, up to long and in diameter, with a line (very occasionally 2 lines) of hairs running straight down its length, alternating sides at the nodes. The petioles are 5 to 8 mm long with hairy margins. The leaves are green, hairless, oval and opposite, long by wide with a hydathode at the tip. The flowers are small, less than 1 cm in diameter, with 5 white petals, 1–3 mm long, nestled inside the larger (3–5 mm long) sepals. These sepals have long, wavyvillous hairs on their outer (distal) sides and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weeds
A weed is an unwanted plant of any species. Weed or weeds may also refer to: Places * Weed, Arkansas, an unincorporated community in the United States * Weed, California, a city in the United States * Weed, Kentucky, an unincorporated community in the United States * Weed, New Mexico, an unincorporated community and census-designated place in the United States * Weed Lake, a wetland in Calgary County, Alberta, Canada Arts, entertainment, and media Film and television * ''Weeds'' (1987 film), starring Nick Nolte * ''Weeds'' (2017 film), an animated short film featuring an anthropomorphic dandelion * ''Weeds'' (TV series), an American dark comedy television series about a drug-dealing suburban soccer mom * "Weeds" (''Millennium''), an episode of the TV series ''Millennium'' Music * The Weeds (band), a 1980s indie pop band * The Lollipop Shoppe, later The Weeds, a 1960s American garage band * ''Weed'' (album), a 2004 Chris Whitley album * ''Weeds'' (album), a 1969 album ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weed Of Cultivation
A weed of cultivation is any plant that is well-adapted to environments in which land is cultivated for growing some other plant. Many such weeds are quite specialised and can only thrive and reproduce where the ground has been broken by plough or spade. They are invariably annual and reproduction is by seed alone, which can in many species lie dormant for years in the soil until brought to the surface during cultivation. They have fast reproduction cycles, usually in one year from seed to seed, though some species can have more than one generation in one season. A few species such as groundsel ('' Senecio vulgaris''), shepherd's purse ('' Capsella bursa-pastoris''), red deadnettle (''Lamium purpureum'') and chickweed ('' Stellaria media'') can survive unharmed through very cold weather and are often able to seed even in winter. See also * Crop weed Crop weeds are weeds that grow amongst crops. Despite the potential for some crop weeds to be used as a food source, many can a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abelmoschus Ficulneus
''Abelmoschus ficulneus'' is a species of flowering plant in the genus ''Abelmoschus'' of the family Malvaceae. It is commonly known as the "white wild musk mallow" or native rosella, it is a fibrous perennial with a woody stem. Its flowers bloom about an inch in diameter with colors of pink or white, with a rose center; its leaves are palmate. This fast growing plant can also be cultivated for its medicinal properties, making it a very versatile plant that is greatly beneficial for human use. This plant can be found mainly in north and East Africa, Madagascar, Indomalaya, and Northern Australia. Taxonomy This species was first recorded by Wight and Arn. in 1833. They are eudicots, characterized by their flower petals growing in groups of five parts. They have two embryonic leaves, which are also known as the cotyledon. In addition, their leaves are also veined. They are from the genus ''Abelmoschus'', family Malvacea, and belong to the clade angiosperms, and are classifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reynoutria Japonica
''Reynoutria japonica'', synonyms ''Fallopia japonica'' and ''Polygonum cuspidatum'', is a species of herbaceous perennial plant in the knotweed and buckwheat family Polygonaceae. Common names include Japanese knotweed and Asian knotweed. It is native to East Asia in Japan, China and Korea. In North America and Europe, the species has successfully established itself in numerous habitats, and is classified as a pest and invasive species in several countries. The plant is popular with beekeepers, and its young stems are edible, making it an increasingly popular foraging, foraged vegetable with a flavour described as lemony rhubarb. Description The flowers are small, cream or white, produced in erect racemes long in late summer and early autumn. Japanese knotweed has hollow stems with distinct raised node (botany), nodes that give it the appearance of bamboo, though it is not related. While stems may reach a maximum height of each growing season, it is typical to see much smaller ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Striga
''Striga'', commonly known as witchweed, is a genus of parasitic plants that occur naturally in parts of Africa, Asia, and Australia. It is currently classified in the family Orobanchaceae, although older classifications place it in the Scrophulariaceae. Some species are serious pathogens of cereal crops, with the greatest effects being in savanna agriculture in Africa. It also causes considerable crop losses in other regions, including other tropical and subtropical crops in its native range and in the Americas. The generic name derives from Latin wikt:striga#Latin, ''strī̆ga'', "witch". Witchweeds are characterized by bright-green stems and leaves and small, brightly colored and attractive flowers.Sand, Paul, Robert Eplee, and Randy Westbrooks. ''Witchweed Research and Control in the United States''. Champaign, IL: Weed Science Society of America, 1990. They are obligate parasite, obligate hemiparasites of roots and require a living host for germination and initial developmen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dandelion
''Taraxacum'' () is a genus of flowering plants in the family Asteraceae, which consists of species commonly known as dandelions. The scientific and hobby study of the genus is known as taraxacology. The genus has a near-cosmopolitan distribution, absent only from tropical and polar areas. Two of the most common species worldwide, '' T. officinale'' (the common dandelion) and '' T. erythrospermum'' (the red-seeded dandelion), are European species introduced into North America, where they are non-native. Dandelions thrive in temperate regions and can be found in yards, gardens, sides of roads, among crops, and in many other habitats. Like other members of the family Asteraceae, they have very small flowers collected together into a composite flower head. Each single flower in a head is called a ''floret''. In part due to their abundance, along with being a generalist species, dandelions are one of the most vital early spring nectar sources for a wide host of polli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barnyard Grass
''Echinochloa'' is a very widespread genus of plants in the grass family and tribe Paniceae. Some of the species are known by the common names barnyard grass or cockspur grass. Some of the species within this genus are millets that are grown as cereal or fodder crops. The most notable of these are Japanese millet (''E. esculenta'') in East Asia, Indian barnyard millet (''E. frumentacea'') in South Asia, and burgu millet (''E. stagnina'') in West Africa. Collectively, the members of this genus are called barnyard grasses (though this may also refer to '' E. crus-galli'' specifically), and are also known as barnyard millets or billion-dollar grasses. When not grown on purpose, these grasses may become a nuisance to farmers. In particular, common barnyard grass (''E. crus-galli'') is notorious as a weed. It is not easily suppressed with living mulches such as velvet bean (''Mucuna pruriens'' var. ''utilis''). Early barnyard grass (''E. oryzoides'') is a well-known example of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vavilovian Mimicry
In plant biology and agriculture, Vavilovian mimicry (also crop mimicry or weed mimicry) is a form of mimicry in plants where a weed evolves to share characteristics with a crop plant through generations of involuntary artificial selection. It is named after the Russian plant geneticist Nikolai Vavilov. Selection against the weed may occur by killing a young or adult weed, by separating its seeds from those of the crop by winnowing, or both. The process has operated since Neolithic times, creating secondary crops such as rye and oats through mimicry of cereals such as wheat. Definition Vavilovian mimicry is a form of mimicry in plants where a weed of cultivation evolves to share characteristics with a crop through generations of artificial selection. It is sometimes described as crop mimicry or weed mimicry. It is named after Nikolai Vavilov, a prominent Russian plant geneticist of the early 20th century. In addition, Vavilov described as 'secondary crops' cereals such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weed
A weed is a plant considered undesirable in a particular situation, growing where it conflicts with human preferences, needs, or goals.Harlan, J. R., & deWet, J. M. (1965). Some thoughts about weeds. ''Economic botany'', ''19''(1), 16-24. Plants with characteristics that make them hazardous, aesthetically unappealing, difficult to control in managed environments, or otherwise unwanted in agriculture, farm land, Orchard, orchards, gardens, lawns, Park, parks, recreational spaces, residential and industrial areas, may all be considered weeds.Holzner, W., & Numata, M. (Eds.). (2013). ''Biology and ecology of weeds'' (Vol. 2). Springer Science & Business Media. The concept of weeds is particularly significant in agriculture, where the presence of weeds in fields used to grow crops may cause major losses in yields. Invasive species, plants introduced to an environment where their presence negatively impacts the overall functioning and biodiversity of the ecosystem, may also sometime ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rice
Rice is a cereal grain and in its Domestication, domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa. Rice is the seed of the grass species ''Oryza sativa'' (Asian rice)—or, much less commonly, ''Oryza glaberrima'' (African rice). Asian rice was domesticated in China some 13,500 to 8,200 years ago; African rice was domesticated in Africa about 3,000 years ago. Rice has become commonplace in many cultures worldwide; in 2023, 800 million tons were produced, placing it third after sugarcane and maize. Only some 8% of rice is traded internationally. China, India, and Indonesia are the largest consumers of rice. A substantial amount of the rice produced in developing nations is lost after harvest through factors such as poor transport and storage. Rice yields can be reduced by pests including insects, rodents, and birds, as well as by weeds, and by List of rice diseases, diseases such as rice blast. Traditional rice polyc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
