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Peronospora farinosa is a species name that has been widely applied to downy mildew on leaves of wild and cultivated Amaranthaceae: Amaranthus, Atriplex, Bassia, Beta, Chenopodium, Halimione, Salsola, Spinacia, etc. However, the species name has been taxonomically rejected (see report 20 from the Nomenclature Committee for fungi) as the original description contained reference to multiple species and could not unequivocally be attributed to a species of Peronospora. In the past, some of the species on important crop plants have been given names as formae speciales, notably f.sp. betae on sugar beet (= P. schachtii) and f.sp. spinaciae on spinach (= P. effusa). However, phylogentic reconstructions have revealed that these "forms" of Peronospora on different genera and their subdivisions, ar

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  • Peronospora farinosa es un protista oomiceto, patógeno de plantas, llamado comúnmente mildiu de la espinaca, aunque puede infectar otras plantas, cultivadas o espontáneas de varios géneros de la familia Amaranthaceae. En el pasado, algunas formas que afectan a plantas de interés económico eran clasificadas en diferentes especies,​ pero ahora se sabe que estas formas de mildiu son generalmente producidas por una única especie P. farinosa. Por ejemplo, P. farinosa sp. betae afecta a la remolacha azucarera Beta vulgaris, y P. farinosa sp. spinaciae a la espinaca Spinacia oleracea​ Como en otros mildius, el patógeno persiste durante el invierno en forma de oosporas en el suelo del cultivo, en las semillas o sobre la propia planta.​ En el caso de la remolacha la infección se realiza durante el estadio de germinación y la formación de la plántula. Los cotiledones son sistemáticamente infectados, resultando en una decoloración y deformación. La infección es menos efectiva en las hojas maduras de la remolacha. El control de la enfermedad se realiza tratando las semillas y retirando aquellas plantas que han sido infectadas. Por lo general no es necesario el uso de fungicidas. En las espinacas ataca las hojas desarrolladas, y el tratamiento requiere el uso de fungicidas específicos. (es)
  • Peronospora farinosa is a species name that has been widely applied to downy mildew on leaves of wild and cultivated Amaranthaceae: Amaranthus, Atriplex, Bassia, Beta, Chenopodium, Halimione, Salsola, Spinacia, etc. However, the species name has been taxonomically rejected (see report 20 from the Nomenclature Committee for fungi) as the original description contained reference to multiple species and could not unequivocally be attributed to a species of Peronospora. In the past, some of the species on important crop plants have been given names as formae speciales, notably f.sp. betae on sugar beet (= P. schachtii) and f.sp. spinaciae on spinach (= P. effusa). However, phylogentic reconstructions have revealed that these "forms" of Peronospora on different genera and their subdivisions, are distinct species, most of which already have previously published scientific names (see Index Fungorum). Such host specialization possibly also exists with respect to the various wild amaranthaceous species given as hosts of P. farinosa. Downy mildew is a moderately important disease of sugar beet (Beta vulgaris). The pathogen persists as oospores in the soil, or on beet seed crops, or on overwintered volunteer beet plants. Attacks are most important at the seedling stage. The cotyledons are systemically infected, becoming discoloured and distorted. Loss of seedlings causes uneven crop development. Beet leaves are less affected, so a crop can to a substantial effect recover from an attack on seedlings. Control relies on adequate crop rotation and avoidance of sources of infection (e.g. adequate control of the disease on beet seed crops), as oospores survive only 2–3 years in the soil. Individual infected plants may also be removed. It is not generally necessary to apply fungicides. Downy mildew has more direct importance on spinach (Spinacia oleracea), since it affects the harvested part (leaves). Yellow lesions appear on the older leaves. If rotating crops and removing individual infected plants fails, fungicide treatments are effective, and resistant cultivars are available. (en)
  • Wolf (Pseudoperonospora farinosa f.sp. spinaciae syn. Peronospora farinosa f.sp. spinaciae) is een valse meeldauw en de belangrijkste schimmelziekte bij spinazie. Het vormt een grijs schimmelpluis op de onderkant en soms ook op de bovenkant van de bladeren. Alleen bij de vroege teelt van spinazie met zaai in december komt wolf niet voor. De oösporen blijven 2-3 jaar levensvatbaar in de grond. De oöspore kan na kieming een sporangium vormen. * Wolf op Breedblad scherpzaad * Wolf op Breedblad scherpzaad enkele dagen later * Sporangiofoor en sporangiën * Sporangiofoor met sporangium * Sporangiën en sporangiosporen * Sporangium De sporen uit het sporangium van de schimmel dringen de plant binnen en vormen intercellulaire, vingervormige haustoria. Vervolgens vormt de schimmel voor verdere verspreiding sporangioforen met grijze sporangiën. (nl)
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  • (en)
  • Rabenh. (en)
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  • Peronospora (en)
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  • Pseudoperonospora effusa onSpinacia oleracea 'Breedblad scherpzaad' (en)
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  • effusa (en)
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  • (en)
  • Botrytis effusa (Grev. ) (en)
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  • Peronospora farinosa es un protista oomiceto, patógeno de plantas, llamado comúnmente mildiu de la espinaca, aunque puede infectar otras plantas, cultivadas o espontáneas de varios géneros de la familia Amaranthaceae. En el pasado, algunas formas que afectan a plantas de interés económico eran clasificadas en diferentes especies,​ pero ahora se sabe que estas formas de mildiu son generalmente producidas por una única especie P. farinosa. Por ejemplo, P. farinosa sp. betae afecta a la remolacha azucarera Beta vulgaris, y P. farinosa sp. spinaciae a la espinaca Spinacia oleracea​ (es)
  • Peronospora farinosa is a species name that has been widely applied to downy mildew on leaves of wild and cultivated Amaranthaceae: Amaranthus, Atriplex, Bassia, Beta, Chenopodium, Halimione, Salsola, Spinacia, etc. However, the species name has been taxonomically rejected (see report 20 from the Nomenclature Committee for fungi) as the original description contained reference to multiple species and could not unequivocally be attributed to a species of Peronospora. In the past, some of the species on important crop plants have been given names as formae speciales, notably f.sp. betae on sugar beet (= P. schachtii) and f.sp. spinaciae on spinach (= P. effusa). However, phylogentic reconstructions have revealed that these "forms" of Peronospora on different genera and their subdivisions, ar (en)
  • Wolf (Pseudoperonospora farinosa f.sp. spinaciae syn. Peronospora farinosa f.sp. spinaciae) is een valse meeldauw en de belangrijkste schimmelziekte bij spinazie. Het vormt een grijs schimmelpluis op de onderkant en soms ook op de bovenkant van de bladeren. Alleen bij de vroege teelt van spinazie met zaai in december komt wolf niet voor. De oösporen blijven 2-3 jaar levensvatbaar in de grond. De oöspore kan na kieming een sporangium vormen. * Wolf op Breedblad scherpzaad * Wolf op Breedblad scherpzaad enkele dagen later * Sporangiofoor en sporangiën * Sporangiofoor met sporangium * * Sporangium (nl)
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  • Peronospora farinosa (es)
  • Wolf (plantenziekte) (nl)
  • Peronospora farinosa (en)
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