Peronospora farinosa: Difference between revisions
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'''''Peronospora farinosa''''' is a |
'''''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 ([https://imafungus.biomedcentral.com/articles/10.5598/imafungus.2017.08.01.12 see report 20 from the Nomenclature Committee for fungi)] as the orignal 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'',<ref name="Holliday">{{cite book|author=Holliday P|title=A Dictionary of Plant Pathology|publisher=Cambridge University Press|year=2001|isbn=978-0-521-59458-5|edition=2nd}}</ref> notably ''[[Peronospora farinosa f.sp. betae|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 subdevisions, are distinct species<ref>{{Cite journal|last=Choi|first=Young-Joon|last2=Klosterman|first2=Steven J.|last3=Kummer|first3=Volker|last4=Voglmayr|first4=Hermann|last5=Shin|first5=Hyeon-Dong|last6=Thines|first6=Marco|date=2015-05|title=Multi-locus tree and species tree approaches toward resolving a complex clade of downy mildews (Straminipila, Oomycota), including pathogens of beet and spinach|url=https://linkinghub.elsevier.com/retrieve/pii/S1055790315000585|journal=Molecular Phylogenetics and Evolution|language=en|volume=86|pages=24–34|doi=10.1016/j.ympev.2015.03.003|pmc=PMC5736102|pmid=25772799}}</ref>, most of which already have previously published scientific names<ref name=Brandenburger>{{cite book | author = Brandenburger W | title = Parasitische Pilze an Gefässpflanzen in Europa | publisher = Gustav Fischer Verlag | year = 1985 | isbn = 978-3-437-30433-0}}</ref> (see ''Index Fungorum''). Such host specialization possibly also exists with respect to the various wild amaranthaceous species given as hosts of ''P. farinosa''. |
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Downy mildew is a moderately important disease of [[sugar beet]] (''Beta vulgaris'').<ref name=Smith /> The pathogen persists as [[oospore]]s 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.<ref name=EPPO12>{{cite book | author = OEPP | author2 = EPPO | title = ''Beet''. EPPO Standards PP2 Good Plant Protection Practice, no. 12 | publisher = European and Mediterranean Plant Protection Organization | year = 1997}}</ref> |
Downy mildew is a moderately important disease of [[sugar beet]] (''Beta vulgaris'').<ref name=Smith /> The pathogen persists as [[oospore]]s 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.<ref name=EPPO12>{{cite book | author = OEPP | author2 = EPPO | title = ''Beet''. EPPO Standards PP2 Good Plant Protection Practice, no. 12 | publisher = European and Mediterranean Plant Protection Organization | year = 1997}}</ref> |
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Revision as of 22:32, 6 December 2020
| Peronospora farinosa | |
|---|---|
.jpg)
| |
| Pseudoperonospora farinosa f.sp. spinaciae at Spinacia oleracea 'Breedblad scherpzaad' | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Clade: | Stramenopiles |
| Phylum: | Oomycota |
| Order: | Peronosporales |
| Family: | Peronosporaceae |
| Genus: | Peronospora |
| Species: | P. farinosa
|
| Binomial name | |
| Peronospora farinosa (Fr.) Fr. (1849)
| |
| Forma specialis | |
| Synonyms | |
|
Botrytis effusa Grev. (1824) | |
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 orignal 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,[1] 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 subdevisions, are distinct species[2], most of which already have previously published scientific names[3] (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).[4] 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.[5]
Downy mildew has more direct importance on spinach (Spinacia oleracea),[4] 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.
References
- ^ Holliday P (2001). A Dictionary of Plant Pathology (2nd ed.). Cambridge University Press. ISBN 978-0-521-59458-5.
- ^ Choi, Young-Joon; Klosterman, Steven J.; Kummer, Volker; Voglmayr, Hermann; Shin, Hyeon-Dong; Thines, Marco (2015-05). "Multi-locus tree and species tree approaches toward resolving a complex clade of downy mildews (Straminipila, Oomycota), including pathogens of beet and spinach". Molecular Phylogenetics and Evolution. 86: 24–34. doi:10.1016/j.ympev.2015.03.003. PMC 5736102. PMID 25772799.
{{cite journal}}: Check date values in:|date=(help)CS1 maint: PMC format (link) - ^ Brandenburger W (1985). Parasitische Pilze an Gefässpflanzen in Europa. Gustav Fischer Verlag. ISBN 978-3-437-30433-0.
- ^ a b Smith IM, Dunez J, Lelliott RA, Phillips DH, Archer SA, eds. (1988). European Handbook of Plant Diseases. Blackwell Scientific Publications. ISBN 978-0-632-01222-0.
- ^ OEPP; EPPO (1997). Beet. EPPO Standards PP2 Good Plant Protection Practice, no. 12. European and Mediterranean Plant Protection Organization.
Further reading
- Yamauchi, Norihito; Horinouchi, Hayato; Sakai, Kazuhiko (July 2011). "First report of spinach downy mildew caused by race Pfs:8 of Peronospora farinosa f. sp. spinaciae in Japan". Journal of General Plant Pathology. 77 (4): 260–262. doi:10.1007/s10327-011-0313-2.
