Peronospora pulveracea. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
The Netherlands ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Republic Of Georgia ◽  
Entire Plant ◽  
Rain Splash

Abstract A description is provided for Peronospora pulveracea. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Helleborus caucasicus, H. corsicus (= H. argutifolius), H. foetidus, H. niger, H. purpurascens, H. viridis. DISEASE: Downy mildew of Helleborus species. May develop to cover the entire plant, aborting flowering and leaving the foliage, small, crisped and uniformly grey-brown. The fungus has been reported to destroy whole stands of plants. GEOGRAPHICAL DISTRIBUTION: Asia-Temperate: Azerbaijan, Republic of Georgia. Europe: Austria, Denmark, Eire, France, Germany, Italy, The Netherlands, Poland, Portugal, Romania, Switzerland, UK (England), Yugoslavia. TRANSMISSION: By conidia which are dispersed by wind or rain-splash, and by perennation as mycelium in the rhizome.

Peronospora chlorae. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
The Netherlands ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Disease Transmission ◽  
Republic Of Georgia ◽  
Rain Splash

Abstract A description is provided for Peronospora chlorae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Blackstonia (=Chlora) imperfoliata, B. perfoliata, B. serotina, Centaurium pulchellum, Erythraea centaureum, E. roxburghii, Eustoma russelianum (=Lisianthus russelianus). DISEASE: Downy mildew of Blackstonia and Eustoma. GEOGRAPHICAL DISTRIBUTION: Asia-Temperate: Abkhasiya, Azerbaijan, Republic of Georgia. Asia-Tropical: India. Europe: Denmark, France, Hungary, Italy, The Netherlands, Portugal, Spain, Switzerland, Ukraine, UK (England, Guernsey, Jersey), Yugoslavia. TRANSMISSION: By conidia dispersed by wind or rain-splash. The role of oospores in disease transmission is unknown, but they may act as perennating structures.

Peronospora digitalis. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
Downy Mildew ◽  
Geographical Distribution ◽  
Republic Of Georgia ◽  
Rain Splash

Abstract A description is provided for Peronospora digitalis. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Digitalis ferruginea, D. grandiflora (= D. ambigua), D. lutea, D. purpurea. DISEASE: Downy mildew of Digitalis species. Leaf lesions are hypophyllous, dark brown, spherical, initially 1-2 cm diam., eventually coalescing. GEOGRAPHICAL DISTRIBUTION: Asia-Temperate: Azerbaijan, Republic of Georgia. Europe: Czechoslovakia, France, Germany, Lithuania, Norway, Poland, Romania, Switzerland, Ukraine, UK (England, Scotland, Wales). TRANSMISSION: By conidia dispersed by wind or rain-splash.

Peronospora rumicis. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
South Africa ◽  
New Zealand ◽  
Geographical Distribution ◽  
Dense Layer ◽  
Republic Of Georgia ◽  
Rumex Acetosa ◽  
Polygonum Convolvulus ◽  
Plant Remains ◽  
Rain Splash ◽  
Roll Back

Abstract A description is provided for Peronospora rumicis. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Emex spinosa, Polygonum convolvulus, Rumex acetosa, R. acetosella, R. alpestris (= R. arifolius), R. auriculatus, R. aviculare, R. hastatus, R. lunaria, R. longifolius, R. montanus, R. patienta, R. polyanthemus, R. repens, R. scutatus, R. thyrsifolius, R. tuberosus, R. vesicarius. DISEASE: Downy mildew of Rumex. Both leaves and flowers are infected. On R. acetosella, the plant remains upright following infection and the upper leaves crumple. In other Rumex species, infected leaves become covered in a very dense layer of violet-coloured felt on their undersurface, whereas a grey felt layer develops on flowers. Leaves become yellowish and their margins roll back (39, 159). GEOGRAPHICAL DISTRIBUTION: Africa: Libya, Morocco, South Africa. Asia-Temperate: Azerbaijan, Republic of Georgia, Israel, Kazakhstan, Kirghizistan, Stavropol. Asia-Tropical: India. Australasia: New Zealand. Europe: Austria, Cyprus, Czechoslovakia, Denmark, Eire, Estonia, Faeroes, Finland, France, Germany, Hungary, Italy, Latvia, Norway, Poland, Romania, Russia (Novgorod, St. Petersburg, Smolensk, Yaroslavl), Serbia, Sweden, Switzerland, Ukraine, UK (England, Scotland), Yugoslavia. TRANSMISSION: By conidia which are dispersed by wind or rain-splash. Mycelium perennates in the root.

Peronospora oerteliana. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
Downy Mildew ◽  
Geographical Distribution ◽  
Disease Transmission ◽  
Rain Splash

Abstract A description is provided for Peronospora oerteliana. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Primula acaulis, P. algida, P. elatior, P. juliae, P. officinalis, P. veris, P. vulgaris. DISEASE: Downy mildew of Primula species. GEOGRAPHICAL DISTRIBUTION: Asia-Temperate: Kazakhstan. Europe: Czechoslovakia, Denmark, Eire, France, Germany, Poland, Romania, Sweden, Switzerland, Yugoslavia, UK (England, Scotland). TRANSMISSION: By conidia which are dispersed by wind or rain-splash. The role of oospores in disease transmission is unknown, but they may have a perennating function.

Peronospora sordida. [Descriptions of Fungi and Bacteria].

1991 ◽  
Author(s):  
G. Hall
Keyword(s):  
New York ◽  
North America ◽  
Northern Ireland ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Plant Pathogen ◽  
Disease Transmission ◽  
Channel Islands ◽  
Rain Splash

Abstract A description is provided for Peronospora sordida. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Scrophularia altaica, S. aquatica, S. auriculata, S. bosniaca, S. californica, S. heterophylla, S. lanceolata, S. marylandica, S. nodosa, S. scopolii, S. umbrosa (=S. alata), Verbascum banaticum, V. blattaria, V. densiflorum (=V. thapsiforme), V. glabratum subsp. glabratum, V. lychnitis, V. nigrum, V. phlomoides, V. phoenicum, V. speciosum, V. thapsus, V. thapsus subsp. crassifolium (=V. montanum), V. virgatum. DISEASE: Downy mildew of Scrophularia and Verbascum, some species of which may be cultivated commercially for their medicinal or ornamental value; an obligately necrotrophic plant pathogen. GEOGRAPHICAL DISTRIBUTION: Asia; USSR (Kirghizia, Turkmenia, Uzbekistan). Europe; Austria, Belgium, France, Czechoslovakia, Denmark, Eire, Finland, Germany, Hungary, Italy, Netherlands, Norway, Poland, Rumania, USSR (Byelorussia, Estonia, Latvia, Lithuania, RSFSR, Ukraine), Sweden, Switzerland, UK (England, Channel Islands, Northern Ireland, Scotland, Wales), Yugoslavia. North America; USA (California, Illinois, Indiana, Iowa, Kansas, Kentucky, Missouri, Nebraska, New York, Ohio, Wisconsin, Virginia). TRANSMISSION: By spores ('conidia') dispersed by wind or rain-splash. The role of oospores (if they are usually formed) in disease transmission is unknown.

Pseudocercospora kaki. [Descriptions of Fungi and Bacteria].

2000 ◽  
Author(s):  
J. C. David
Keyword(s):  
Hong Kong ◽  
North America ◽  
South America ◽  
Geographical Distribution ◽  
Leaf Spot ◽  
Minas Gerais ◽  
Republic Of Georgia ◽  
Rain Splash

Abstract A description is provided for Pseudocercospora kaki. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Leaf spot of persimmon. HOSTS: Diospyros hispida, D. kaki, D. lotus, D. texana, D. tupru (Ebenaceae). GEOGRAPHICAL DISTRIBUTION: NORTH AMERICA: USA (Louisiana), Bermuda. SOUTH AMERICA: Brazil (São Paolo, Minas Gerais). ASIA: China (Hong Kong, other provinces also, see GUO & HSIEH, 1995), Republic of Georgia (BRAUN & MEL'NIK, 1997), India, Iran (56: 5475), Japan, Nepal, Taiwan. EUROPE: Russia (BRAUN & MEL'NIK, 1997). TRANSMISSION: Conidia are dispersed by rain splash (ZHU et al., 1996).

Peronospora knautiae. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
Downy Mildew ◽  
Geographical Distribution ◽  
Leaf Spots ◽  
Rain Splash

Abstract A description is provided for Peronospora knautiae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Cephalaria transylvanica, Knautia arvensis, K. carpatica, K. caucasica, K. drymeia subsp. drymeia, K. integrifolia, K. godeti, K. montana, K. silvatica, Pterocephalus plumosus, Scabiosa columbaria, S. lucida, S. ochroleuca, Succisa pratensis. DISEASE: Downy mildew of Knautia and Scabiosa species. Leaf spots are violet or brown and sparse. GEOGRAPHICAL DISTRIBUTION: Asia-Temperate: Azerbaijan, Stavropol, Turkmenistan. Europe: Austria, Czechoslovakia, Denmark, Estonia, France, Germany, Italy, Latvia, Lithuania, Norway, Poland, Romania, Russia (Novgorod, Pskov, St. Petersburg, Yaroslavl), Sweden, Switzerland, Ukraine. TRANSMISSION: By conidia which are dispersed by wind or rain-splash.

Ramularia onobrychidis. [Descriptions of Fungi and Bacteria].

2004 ◽  
Author(s):  
J. C. David
Keyword(s):  
Great Britain ◽  
Geographical Distribution ◽  
Arachis Hypogaea ◽  
Leaf Spot ◽  
Republic Of Georgia ◽  
Leaf Fall ◽  
Splash Dispersal ◽  
Rain Splash

Abstract A description is provided for Ramularia onobrychidis. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Leaf spot of sainfoin. HOSTS: Arachis hypogaea, Onobrychis altissima, O. arenaria, O. hajastana, O. hohenhackeriana, O. miniata, O. oxyodonta, O. pulchella, O. sintenisii, O. transcaucasica, O. vaginalis, O. viciifolia (BRAUN, 1998) (Fabaceae). GEOGRAPHICAL DISTRIBUTION: ASIA: Armenia, Azerbaijan (EIBATOVA, 1958), Republic of Georgia, Kabardino-Balkariya, Kazakhstan, Kirgistan, Tadzhikistan (OSIPYAN, 1975), Turkmenistan, Uzbekistan. EUROPE: Austria, Belarus (OSIPYAN, 1975), Bulgaria, Denmark, Estonia, France, Germany, Great Britain, Hungary, Italy, Latvia, Lithuania, Moldova (OSIPYAN, 1975), Romania (BONTEA, 1985), Russia, Sweden, Turkey, Ukraine, Serbia. TRANSMISSION: By wind and rain-splash dispersal of conidia. HUGHES (1949) stated that sclerotia are formed in the lesions: the leaflets are readily detached and in moist conditions the sclerotia can develop after leaf fall, they can also be blown around aiding dispersal of the fungus.

Septoria oenotherae. [Descriptions of Fungi and Bacteria].

1999 ◽  
Author(s):  
T. V. Andrianova
Keyword(s):  
Geographical Distribution ◽  
Infected Plant ◽  
Far East ◽  
Republic Of Georgia ◽  
Plant Debris ◽  
Oenothera Biennis ◽  
Evening Primrose ◽  
Apparent Infection Rate ◽  
Rain Splash ◽  
Chemical Fungicides

Abstract A description is provided for Septoria oenotherae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Leaf spot. In seed stocks, conidiomata are usually encountered on fragments of pods, stems or leaves, and only rarely on the seeds (SIMPSON et al., 1995). Development of S. oenotherae leads to severe blight, with drying of all the leaves starting from the bottom of the plant. This reduces vitality of the plant, and may cause its death. HOSTS: Calylophus sp., Camissonia sp., Gaura sp., Godetia grandiflora, Ludwigia sp., Oenothera biennis (syn. : Onagra biennis), Oenothera decumbens, O. lamarkiana, O. muricata, O. odorata, O. sinuata (Onagraceae). [Type host - Oenothera biennis.] GEOGRAPHICAL DISTRIBUTION: Asia: Armenia, Azerbaijan, Republic of Georgia, Kazakhstan, Korea, Russia (Far East). Australasia: New Zealand. Europe: Belgium, Czech Republic, Denmark, Estonia, Germany, Italy, Hungary, Latvia, Lithuania, Moldova, Netherlands, Poland, Portugal, Romania, Russia, UK, Ukraine. North America: Canada (Ontario), USA. TRANSMISSION: By air-borne or splash dispersed conidia from infected plant débris and seed stocks. Septoria oenotherae can be transmitted by infected débris in evening primrose seed stock; disease progress may then be influenced by variety, sanitation and chemical fungicides; further, the low rL (apparent infection rate) values can be taken as indicative of a primarily rain-splash spread disease (SIMPSON et al, 1999).

Peronospora euphorbiae. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
South Africa ◽  
North America ◽  
South Dakota ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Disease Transmission ◽  
Rain Splash

Abstract A description is provided for Peronospora euphorbiae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Euphorbia dulcis, E. paralias, E. peploides, E. peplus, E. platyphylla, E. prostrata, E. serpens, E. serpyllifolia, E. serratula (= E. stricta). DISEASE: Downy mildew of Euphorbia species. Leaf lesions are hypophyllous, but superficial in E. paralias, as it has stomata on the upper surface of its leaves, which curl upwards. GEOGRAPHICAL DISTRIBUTION: Africa: South Africa. Asia-Temperate: Japan. Europe: France, Italy, Majorca, Poland, Romania, Spain, Switzerland, UK (England). North America: USA (South Dakota, Texas). TRANSMISSION: By conidia which are dispersed by wind or rain-splash. The role of oospores in disease transmission is unknown, but they may serve as perennating structures.

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