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Podosphaera Pannosa
''Podosphaera pannosa'' is a plant pathogen. It produces a powdery mildew on members of the rose family. Summary Rose powdery mildew lso known as 'Weeping Mildred'is caused by the fungus ''Podosphaera pannosa'', a member of the Ascomycete fungi. It infects a wide variety of roses, but especially those grown in dryer climates as the fungus has the rare characteristic that not only does it not need water to germinate and reproduce, it can be inhibited by it. Disease cycle The disease cycle of rose powdery mildew starts when the sexual spores, ascospores, of the pathogen survive the winter in a structure composed of hyphae called an ascocarp. The specific ascocarp is a chasmothecium, or cleistothecium, and has a circular shape to it. Under the right conditions the chasmothecium will break open to reveal the asci, which are long tube-like structures containing the ascospores. These ascospores are then released and spread by wind, insects, and rain until they land on a susceptible ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rose Powdery Mildew
A rose is either a woody perennial flowering plant of the genus ''Rosa'' (), in the family Rosaceae (), or the flower it bears. There are over three hundred species and tens of thousands of cultivars. They form a group of plants that can be erect shrubs, climbing, or trailing, with stems that are often armed with sharp prickles. Their flowers vary in size and shape and are usually large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia, with smaller numbers native to Europe, North America, and northwestern Africa. Species, cultivars and hybrids are all widely grown for their beauty and often are fragrant. Roses have acquired cultural significance in many societies. Rose plants range in size from compact, miniature roses, to climbers that can reach seven meters in height. Different species hybridize easily, and this has been used in the development of the wide range of garden roses. Etymology The name ''rose'' comes from Lati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rose Powdery Mildew Conidia
A rose is either a woody perennial flowering plant of the genus ''Rosa'' (), in the family Rosaceae (), or the flower it bears. There are over three hundred species and tens of thousands of cultivars. They form a group of plants that can be erect shrubs, climbing, or trailing, with stems that are often armed with sharp prickles. Their flowers vary in size and shape and are usually large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia, with smaller numbers native to Europe, North America, and northwestern Africa. Species, cultivars and hybrids are all widely grown for their beauty and often are fragrant. Roses have acquired cultural significance in many societies. Rose plants range in size from compact, miniature roses, to climbers that can reach seven meters in height. Different species hybridize easily, and this has been used in the development of the wide range of garden roses. Etymology The name ''rose'' comes from Lati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascospore
An ascus (; ) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. ''Monosporascus cannonballus''), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. ''Tympanis'') with hundreds of conidia, or the ascospores may fragment, e.g. some ''Cordyceps'', also filling the asci with smaller cells. Ascospores are nonmotile, usually single celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. The term ocular chamber, or oculus, refers to the epiplasm (the portion of cytoplasm not used in ascospore formation) that is surrounded by the "bourrelet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosa Roxburghii
Rosa or De Rosa may refer to: People *Rosa (given name) * Rosa (surname) *Santa Rosa (female given name from Latin-a latinized variant of Rose) Places *223 Rosa, an asteroid * Rosa, Alabama, a town, United States *Rosa, Germany, in Thuringia, Germany * Rösa, a village and former municipality in Saxony-Anhalt, Germany *Rosà a town in the province of Vicenza, Veneto, Italy *Monte Rosa, the second highest mountain in the Alps and Western Europe *Republic of South Africa, a southernmost country in Africa. Film and television * ''Rosa'' (1986 film), a Hong Kong film released by Bo Ho Films *'' Rosa – A Horse Drama'', a 1993-94 opera by Louis Andriessen on a libretto by Peter Greenaway * "Rosa" (''Doctor Who''), an episode of the eleventh series of ''Doctor Who'' Music *De Rosa (band), a band from Scotland *"Rosa", a song by Anitta and Prince Royce from the album ''Kisses'', 2019 *"Rosa", a song by Jacques Brel *"Rosa", a song by J Balvin from '' Colores'', 2020 Vehicles *, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosa Kweichowensis
Rosa or De Rosa may refer to: People *Rosa (given name) *Rosa (surname) *Santa Rosa (female given name from Latin-a latinized variant of Rose) Places *223 Rosa, an asteroid *Rosa, Alabama, a town, United States *Rosa, Germany, in Thuringia, Germany *Rösa, a village and former municipality in Saxony-Anhalt, Germany *Rosà a town in the province of Vicenza, Veneto, Italy *Monte Rosa, the second highest mountain in the Alps and Western Europe *Republic of South Africa, a southernmost country in Africa. Film and television * ''Rosa'' (1986 film), a Hong Kong film released by Bo Ho Films *''Rosa – A Horse Drama'', a 1993-94 opera by Louis Andriessen on a libretto by Peter Greenaway * "Rosa" (''Doctor Who''), an episode of the eleventh series of ''Doctor Who'' Music *De Rosa (band), a band from Scotland *"Rosa", a song by Anitta and Prince Royce from the album ''Kisses'', 2019 *"Rosa", a song by Jacques Brel *"Rosa", a song by J Balvin from ''Colores'', 2020 Vehicles *, a Unite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosa Laevigata
''Rosa laevigata'', the Cherokee rose, is a white, fragrant rose native to southern China and Taiwan south to Laos and Vietnam, and invasive in the United States. Description It is an evergreen climbing shrub, scrambling over other shrubs and small trees to heights of up to . The leaves are long, with usually three leaflets, sometimes five leaflets, bright glossy green and glabrous. The flowers are diameter, fragrant, with pure white petals and yellow stamens, and are followed by bright red and bristly hips diameter. The flower stem is also very bristly. Cultivation The species was introduced to the southeastern United States in about 1780, where it soon became naturalized, and where it gained its English name. Cultural references The flower is commonly associated with the Trail of Tears, the forced relocation of Native Americans in the southeastern United States. Its white petals are said to represent the tears the Cherokee women shed during the period of great hardship a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosa Lucidissima
Rosa or De Rosa may refer to: People *Rosa (given name) *Rosa (surname) *wiktionary:Santa_Rosa, Santa Rosa (female given name from Latin-a latinized variant of Rose) Places *223 Rosa, an asteroid *Rosa, Alabama, a town, United States *Rosa, Germany, in Thuringia, Germany *Rösa, a village and former municipality in Saxony-Anhalt, Germany *Rosà a town in the province of Vicenza, Veneto, Italy *Monte Rosa, the second highest mountain in the Alps and Western Europe *Republic of South Africa, a southernmost country in Africa. Film and television *Rosa (1986 film), ''Rosa'' (1986 film), a Hong Kong film released by Bo Ho Films *''Rosa – A Horse Drama'', a 1993-94 opera by Louis Andriessen on a libretto by Peter Greenaway * Rosa (Doctor Who), "Rosa" (''Doctor Who''), an episode of the eleventh series of ''Doctor Who'' Music *De Rosa (band), a band from Scotland *"Rosa", a song by Anitta and Prince Royce from the album Kisses (album), ''Kisses'', 2019 *"Rosa", a song by Jacques Bre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosa Chinensis
''Rosa chinensis'' (), known commonly as the China rose, Chinese rose, or Bengal rose, is a member of the genus ''Rosa'' native to Southwest China in Guizhou, Hubei, and Sichuan Provinces. The first publication of ''Rosa chinensis'' was in 1768 by Nikolaus Joseph von Jacquin in ''Observationum Botanicarum'', 3, p. 7 & plate 55. Description It is a shrub that reaches 1–2 m and grows in hedges or forms thickets. The leaves are pinnate, have 3–5 leaflets, each 2.5–6 cm long and 1–3 cm broad. In the wild species (sometimes listed as ''Rosa chinensis'' var. ''spontanea''), the flowers have five pink to red petals. The fruit is a red hip one to two cm in diameter. The strong branches have a smooth purplish-brown bark, and there may be many to no curved, stocky, flat spines. The alternately-arranged leaves, 12 to 27 cm long, are pinnately divided. The petiole and the rachis are sparsely spiny, with glandular hairs. The leaf blades usually have three o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fungal Plant Pathogens And Diseases
A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from the other eukaryotic kingdoms, which by one traditional classification include Plantae, Animalia, Protozoa, and Chromista. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls. Fungi, like animals, are heterotrophs; they acquire their food by absorbing dissolved molecules, typically by secreting digestive enzymes into their environment. Fungi do not photosynthesize. Growth is their means of mobility, except for spores (a few of which are flagellated), which may travel through the air or water. Fungi are the principal decomposers in ecological systems. These and other differences place fungi in a single group of related organisms, named the ''Eumycota'' (''true f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rose Diseases
Roses (''Rosa'' species) are susceptible to a number of pests, diseases and disorders. Many of the problems affecting roses are seasonal and climatic.Ross, D.,''Rose-growing for Pleasure'', Lothian Publishing, Melbourne, 1985, pp. 27 Some varieties of roses are naturally more resistant or immune than others to certain pests and diseases. Cultivation requirements of individual rose species and cultivars, when observed, often assist in the prevention of pests, diseases and disorders.Botanica's Organic Gardening, Random House Publishing, Sydney, 2002, Pests Insects that affect roses are often considered pests. * Aphids (greenfly) (order Hemiptera family Aphididae) ''Macrosiphum rosae'' – Likely to be found on new shoots and buds, aphids are soft bodied insects 1-2 mm long. Often green but occasionally light brown, and sometimes with wings, they may cover (in a colony) the complete growing tip of the plant. Aphids are most active in spring and summer and multi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Podosphaera
''Podosphaera'' is a genus of fungi in the family Erysiphaceae. Species in this genus are plant pathogens, causing powdery mildew. Species *'' Podosphaera aphanis'' *'' Podosphaera balsaminae'' * ''Podosphaera clandestina'' var. ''aucupariae'' * ''Podosphaera clandestina'' var. ''clandestina'' *'' Podosphaera dipsacacearum'' *'' Podosphaera euphorbiae'' *'' Podosphaera euphorbiae-hirtae'' *'' Podosphaera ferruginea'' *'' Podosphaera filipendulae'' *'' Podosphaera fugax'' *'' Podosphaera fuliginea'' *'' Podosphaera fusca'' *'' Podosphaera helianthemi'' *'' Podosphaera leucotricha'' *''Podosphaera macularis'' *''Podosphaera mors-uvae'' *'' Podosphaera myrtillina'' *'' Podosphaera pannosa'' *'' Podosphaera parietariae'' *'' Podosphaera plantaginis'' *'' Podosphaera polemonii'' *'' Podosphaera spiraeae'' *'' Podosphaera thalictri'' *'' Podosphaera tridactyla'' *'' Podosphaera volkartii'' *''Podosphaera xanthii ''Podosphaera fuliginea'' (also known as ''Podosphaera xanthii'') is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
