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Plasmopara Viticola
''Plasmopara viticola'', the causal agent of grapevine downy mildew, is a heterothallic oomycete that overwinters as oospores in leaf litter and soil. In the spring, oospores germinate to produce macrosporangia, which under wet condition release zoospores. Zoospores are splashed by rain into the canopy, where they swim to and infect through stomata. After 7–10 days, yellow lesions appear on foliage. During favorable weather, the lesions sporulate and new secondary infections occur. Description ''Plasmopara viticola'', also known as grape downy mildew, is considered to be the most devastating disease of grapevines in climates with relatively warm and humid summers. It was first observed in 1834 by Schweinitz on ''Vitis aestivalis'' in the southeastern United States. Shortly after this first observation, the pathogen was introduced to European countries where it played a devastating role in the yield and production of their grapes, and consequently their wine. France was among th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Downy Mildew
Downy mildew refers to any of several types of oomycete microbes that are obligate parasites of plants. Downy mildews exclusively belong to the Peronosporaceae family. In commercial agriculture, they are a particular problem for growers of crucifers, grapes and vegetables that grow on vines. The prime example is ''Peronospora farinosa'' featured in NCBI-Taxonomy and HYP3. This pathogen does not produce survival structures in the northern states of the United States, and overwinters as live mildew colonies in Gulf Coast states. It progresses northward with cucurbit production each spring. Yield loss associated with downy mildew is most likely related to soft rots that occur after plant canopies collapse and sunburn occurs on fruit. Cucurbit downy mildew only affects leaves of cucurbit plants. Symptoms Initial symptoms include large, angular or blocky, yellow areas visible on the upper surface. As lesions mature, they expand rapidly and turn brown. The under surface of infected ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plasmopara
''Plasmopara'' is a genus of Oomycota. ''Plasmopara'' species are plant pathogens, causing downy mildew on carrot, parsley, parsnip, chervil Chervil (; ''Anthriscus cerefolium''), sometimes called French parsley or garden chervil (to distinguish it from similar plants also called chervil), is a delicate annual herb related to parsley. It was formerly called myrhis due to its volat ..., and impatiens. References Further reading * * * External links * Water mould plant pathogens and diseases Peronosporales Water mould genera {{plant-disease-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grape Diseases
This is a list of diseases of grapes (''Vitis'' spp.). Bacterial diseases Fungal diseases Miscellaneous diseases and disorders Nematodes, parasitic Phytoplasma, virus and viruslike diseases See also *'' Ampeloglypter ater'' *'' Ampeloglypter sesostris'' *'' Ampelomyia viticola'' *'' Eupoecilia ambiguella'' * Great French Wine Blight *Japanese beetle * List of Lepidoptera that feed on grapevines *'' Maconellicoccus hirsutus'' *'' Otiorhynchus cribricollis'' *'' Paralobesia viteana'' *'' Pseudococcus maritimus'' *'' Pseudococcus viburni'' *'' Zenophassus'' References External links Diseases of Grapevines information from Cooperative Extension Common Names of Diseases, The American Phytopathological Society* ttp://arquivo.pt/wayback/20160523145652/http://winegrapes.wsu.edu/virology/ virus diseases of the grapevine {{Viticulture * Grape A grape is a fruit, botanically a berry, of the deciduous woody vines of the flowering plant genus '' Vitis''. Grapes are a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Mould Plant Pathogens And Diseases
Water (chemical formula ) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, despite not providing food, energy or organic micronutrients. Its chemical formula, H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. "Water" is also the name of the liquid state of H2O at standard temperature and pressure. A number of natural states of water exist. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor. Water co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basidiophora
''Basidiophora'' is a genus of oomycetes belonging to the family Peronosporaceae Peronosporaceae are a family of water moulds that contains 21 genera, comprising more than 600 species. Most of them are called downy mildews. Peronosporaceae are obligate biotrophic plant pathogens. They parasitise their host plants as an .... It is a water mold that causes downy mildew disease on plants such as the New England aster. The species of this genus are found in Europe, Japan, Northern America and New Zealand. Species: *'' Basidiophora delawarensis'' *'' Basidiophora entospora'' *'' Basidiophora montana'' *'' Basidiophora simplex'' References {{Taxonbar, from=Q55941585 Peronosporales Water mould genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forma Specialis
''Forma specialis'' (plural: ''formae speciales''), abbreviated f. sp. (plural ff. spp.) without italics, is an informal taxonomic grouping allowed by the International Code of Nomenclature for algae, fungi, and plants, that is applied to a parasite (most frequently a fungus) which is adapted to a specific host. This classification may be applied by authors who do not feel that a subspecies or variety name is appropriate, and it is therefore not necessary to specify morphological differences that distinguish this form. The literal meaning of the term is 'special form', but this grouping does not correspond to the more formal botanical use of the taxonomic rank of ''forma'' or form. An example is ''Puccinia graminis'' f. sp. ''avenae'', which affects oats. An alternative term in contexts not related to biological nomenclature is physiological race (sometimes also given as biological race, and in that context treated as synonymous with biological form), Previously: Previously: e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Traian Săvulescu
Traian Săvulescu (2 February 1889, Râmnicu Sărat – 29 March 1963, Bucharest) was a Romanian biologist and botanist, founder of the Romanian School of Phytopathology, member and president of the Romanian Academy. Early life and education The third child of Petrache and Maria Săvulescu, he attended primary school and secondary school in Râmnicu Sărat and the Costache Negruzzi College in Iași, where his teacher, Teodor Nicolau, directed him towards the study of botany. After graduation in 1907, he enrolled at the Faculty of Medicine in Bucharest. The next year, he enrolled at the University of Bucharest, Faculty of Natural Sciences, from which he graduated in 1912. After graduation, he embarked on a Ph.D. at the Botanical Institute in Bucharest, which he obtained in 1916 with a doctoral thesis entitled ' (''Study of the species of Campanula L. in the Heterophyllae growing in Romania''). The work was well received and noted with '. Săvulescu became the first doctor of bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alice Săvulescu
Alice Săvulescu (29 October 1905 – 1 February 1970) was a Romanian botanist who studied various fungi and their relationships to their hosts. After completing her undergraduate studies at the University of Bucharest, she earned a Ph.D. from Columbia University before returning to Romania. Throughout her career, she researched and published over 150 scientific papers. She served as deputy director and full director of several research institutions in Romania and was elected a titular member of the Romanian Academy in 1963. Early life Alice Aronescu was born on 29 October 1905 in Oltenița, Călărași County, into a Jewish family. She began her studies in biology at the University of Bucharest, graduating in 1929. That same year, she took a position at the Institute of Tobacco and Fermentation, working there for two years. In 1931, Aronescu went abroad to New York City to continue her education, under the direction of Bernard Ogilvie Dodge. In 1934, she received a PhD in micr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitis Amurensis
''Vitis amurensis'', the Amur grape, is a species of grape native to the Asian continent. Its name comes from the Amur Valley in Russia and China. It is very resistant to frost, but is not tolerant to drought. Selections vary, but as a species it has strong resistance to anthracnose and ripe rot, and moderately strong resistance to downy mildew and powdery mildew. Botanical description A vine with stem 5–10 cm in diameter and typically spreading to 15–18 m, rarely up to 20–25 meters. Tendrils capable of wrapping around things will entwine the branches of neighbouring plants or anything else they can use for support. The bark is dark, scaly and with vertical stripes on old shoots. Young shoots are green, often with a reddish hue, reddish-brown in autumn. The leaves vary greatly in shape. They can be solid, three- or five-lobed, ovate or rounded, arched at the base. The size ranges from 9 to 25 cm with sharp edges and rounded-triangular serrate teeth. The surf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peronospora
''Peronospora'' is a genus of oomycetes that are obligate plant pathogens of many eudicots. Most species in this group produce a downy mildew disease, which can cause severe damage to many different cultivated crops, as well as wild and ornamental plants. There are 19 genera that produce downy mildew, and ''Peronospora'' has been placed alongside '' Pseudoperonospora'' in the group of downy mildews with coloured conidia. ''Peronospora'' has far more species than any other genus of the downy mildews. However, many species have been moved from this genus to be reclassified to other or new genera. Among these was the most famous ''Peronospora'' species, formerly known as ''Peronospora parasitica'', and now known as ''Hyaloperonospora parasitica''. Now, the ''Peronospora'' species of most importance is likely the ''Peronospora tabacina''. ''Peronospora tabacina'' causes blue mold on tobacco plants and can severely reduce yields of this economically important crop to the point where it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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