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 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.

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.

Peronospora potentillae. [Descriptions of Fungi and Bacteria].

1991 ◽  
Author(s):  
G. Hall
Keyword(s):  
British Columbia ◽  
North America ◽  
Downy Mildew ◽  
Geographical Distribution ◽  
Plant Pathogen ◽  
Disease Transmission ◽  
Washington State ◽  
Fragaria Vesca ◽  
Rain Splash

Abstract A description is provided for Peronospora potentillae. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Potentilla argentea, P. aurea subsp. aurea, P. aurea subsp. chrysocraspeda (=P. ternata), P. crantzii, P. pabelliformis, P. gracilis subsp. nuttallii (=P. nuttallii), P. grandiflora, P. nepalensis, P. norvegica, P. norvegica var. hirsuta, P. pulcherrima, P. sterilis. Possibly Fragaria vesca and F. moschata, but see below. DISEASE: Downy mildew of Potentilla species; an obligately necrotrophic plant pathogen. GEOGRAPHICAL DISTRIBUTION: Asia; India, USSR (Uzbekistan). Europe; Czechoslovakia, Denmark, Eire, Finland, France, Germany, Italy, Norway, Poland, Rumania, Sweden, Switzerland, UK (England, Wales, Scotland), USSR (Latvia; RSFSR). North America; USA (Arkansas, Colorado, Idaho, Indiana, Iowa, Kansas, Michigan, New Jersey, Oregon, Texas, Washington State, Wisconsin, Wyoming), Canada (British Columbia, Saskatchewan) TRANSMISSION: By spores ('conidia') dispersed by wind or rain-splash. The role of oospores (if they are usually formed) in disease transmission is unknown.

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 conglomerata. [Descriptions of Fungi and Bacteria].

1994 ◽  
Author(s):  
G. Hall
Keyword(s):  
Geographical Distribution ◽  
Disease Transmission ◽  
Leaf Size ◽  
Washington State ◽  
Republic Of Georgia ◽  
Leaf Fall ◽  
State Transmission ◽  
Rain Splash ◽  
Light Green

Abstract A description is provided for Peronospora conglomerata. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Erodium ciconium, E. cicutarium, E. hoefftianum, Geranium collinum, G. columbinum, G. dissectum, G. lucidum, G. macrorhizum, G. molle, G. ocellatum, G. phaeum, G. pratensis, G. purpureum, G. pusillum, G. pyrenaicum, G. robertianum, G. rotundifolium, G. solanderi, G. sylvaticum, G. transversale. DISEASE: Downy mildew of Geranium species. Conidiophores occur over the entire undersurface of the leaf, which remains small and becomes crinkled and yellowish. In G. pusillum, a weak infection creates only light green patches on affected leaves, but a heavy infection reduces leaf size, and the blade often turns up, causing much tissue damage and subsequent leaf fall (39, 159). GEOGRAPHICAL DISTRIBUTION: Africa: Canary Isles. Asia-Temperate: Armenia, Azerbaijan, Republic of Georgia, Israel, Kazakhstan, Kirgizistan, Uzbekistan, Stravropol, Turkmenistan. Asia-Tropical: India. Australasia: Australia (Qld), New Zealand. Europe: Austria, Czechoslovakia, Denmark, Eire, Finland, France, Germany, Hungary, Italy, Latvia, Lithuania, The Netherlands, Norway, Poland, Portugal, Romania, Russia (Krym, Smolensk, Pskov, Perm, Tatariya), Serbia, Spain, Sweden, Switzerland, Ukraine, UK (England, Scotland), Yugoslavia. North America: Canada (British Columbia), USA (Idaho, Washington State). 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.

Arthrocladiella mougeotii. [Descriptions of Fungi and Bacteria].

1998 ◽  
Author(s):  
V. P. Heluta
Keyword(s):  
Czech Republic ◽  
Geographical Distribution ◽  
Disease Transmission ◽  
Russian Far East ◽  
Far East ◽  
Republic Of Georgia ◽  
Lycium Barbarum ◽  
Initial Stage ◽  
High Infection

Abstract A description is provided for Arthrocladiella mougeotii. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Powdery mildew of Lycium species only. The mycelium, conidiophores, conidia and ascomata form first white, then dirty-grey patches on damaged green parts of the host. Infected parts are deformed slightly and, in cases of high infection, plants can lose their ornamental qualities. Damaged leaves can fall prematurely. HOSTS: Lycium barbarum (= L. europaeum), L. chinense, L. dasystemum, L. halimifolium, L. ovatum, L. potaninii, L. rhombifolium, L. ruthenicum. [Type host - Lycium barbarum] GEOGRAPHICAL DISTRIBUTION: Africa: Canary Islands. Asia (temperate areas only): Armenia, Azerbaijan, China, Republic of Georgia, Israel, Japan, Kazakhstan, Kirghizistan, Korea, Russia (Russian far east), Tadzhikistan, Taiwan, Turkey, Turkmenistan, Uzbekistan. Australasia: New Zealand (introduced). Europe: Austria, Belgium, Bulgaria, Czech Republic, Estonia, France, Germany, Hungary, Italy, Netherlands, Norway, Poland, Rumania, Slovakia, Sweden, Switzerland, UK, Ukraine (southern), former Yugoslavia. North America: USA (introduced). TRANSMISSION: By wind-dispersed conidia. The rôle of ascospores in disease transmission is unknown, although it has been supposed that they can cause the initial stage of the disease.

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 sparsa. [Descriptions of Fungi and Bacteria].

1981 ◽  
Author(s):  
S. M. Francis
Keyword(s):  
Downy Mildew ◽  
Geographical Distribution ◽  
Disease Transmission ◽  
Unknown Origin ◽  
Northern Europe ◽  
Flower Buds ◽  
Rosa Canina ◽  
Necrotic Spots ◽  
One Year

Abstract A description is provided for Peronospora sparsa. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Cultivated roses and the following species, Rosa californica, R. centifolia, R. canina, R. chinensis, R. rubiginosa. DISEASE: Downy mildew of rose. Bright red to purple or, less frequently, brown spots develop on the leaves which fall very readily especially if the bushes are shaken gently. A non-parasitic defoliation of unknown origin termed a 'false mildew' has been reported from France (Tramier, 1962). The necrotic spots formed on the leaves are similar at a certain stage to those caused by P. sparsa. Conidiophores and conidia develop on the under surface of the downy mildew spots in high relative humidity. In Europe their production is sparse but in California it is reported as copious (Baker, 1953). In heavy infections stems and flowers (both calyx and petals) become diseased and badly infected and young stems often die back. Flowers and flower buds can be retarded and malformed by the pathogen without visible damage to the leaves (53, 3523). GEOGRAPHICAL DISTRIBUTION: Africa (Egypt, Morocco, S. Africa, Zimbabwe); Asia (Brunei, Iran, Israel, Japan, Mauritius, Philippines); Australasia (Australia, New Zealand); Europe (Austria, Britain (incl. Jersey), Bulgaria, Czechoslovakia, Estonia, France, Germany, Greece, Iceland, Italy, Latvia, Netherlands, Portugal, Poland, Romania, Sweden, Switzerland, Yugoslavia, USSR); N. America (Canada, USA); S. America (Argentina, Brazil). TRANSMISSION: As dormant mycelium in cuttings and plants. It is reported that mycelium can overwinter within infected stems both from warmer countries such as Australia (57, 2154) and Brazil (19, 98) and also from Northern Europe (53, 3523). The role of oospores in disease transmission is less certain. They have been found in leaves and stems (Baker, 1953; Fraymouth, 1956) and flowers (Cuboni, 1888) but their occurrence seems to be sporadic and they do not appear to be of great importance in carrying over the pathogen. The possibility that the disease may be seed borne was suggested by a worker in Poland (7, 325). In 1926 downy mildew was discovered in a commercial nursery near Lublin on one-year-old seedlings of Rosa canina. The seedlings had been raised from seed imported from Vienna and the inference was that the disease came with the seed especially as all seedlings of local origin were healthy. Peronospora sparsa is not listed as a seed pathogen by Neergaard (1977).

Erysiphe convolvuli. [Descriptions of Fungi and Bacteria].

1998 ◽  
Author(s):  
V. P. Heluta
Keyword(s):  
Geographical Distribution ◽  
Disease Transmission ◽  
Ipomoea Batatas ◽  
European Part ◽  
Republic Of Georgia ◽  
North Caucasus ◽  
Convolvulus Arvensis ◽  
Initial Stage ◽  
Almost All

Abstract A description is provided for Erysiphe convolvuli. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Powdery mildew of members of the Convolvulaceae only. Mycelium, conidiophores, conidia and ascomata form first white, then dirty-grey layers on damaged leaves. Erysiphe convolvuli can be used as an agent of biocontrol against any Convolvulus species which are malicious weeds. HOSTS: Calystegia hederacea, C. sepium, C. silvatica, C. soldanella, Convolvulus althaeoides, C. ammanii, C. arvensis, C. askabadensis (incl. C. pseudocantabrica), C. divaricatus, C. fruticosus, C. galaticus, C. hamadae, C. hirsutus, C. lineatus, C. pilosellaefolius, C. sagittaefolius, C. scammonia, C. siculus, C. subhirsutus, C. tricolor, Ipomoea batatas (?), I. cymosa (?). [Type host - Convolvulus arvensis] GEOGRAPHICAL DISTRIBUTION: Africa: Canary Islands, Egypt, Libya, Morocco. Asia (temperate areas only): Afghanistan, Armenia, Azerbaijan, China, Cyprus, Republic of Georgia, India, Iran, Iraq, Israel, Jordan, Kazakhstan, Kirghizistan, Korea, Lebanon, Mongolia, Pakistan, Russia (north Caucasus, south and southwest Siberia), Saudi Arabia, Turkey, Turkmenistan, Uzbekistan. Europe (almost all): Austria, Bulgaria, Belarus, Czech Republic, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Moldova, Poland, Portugal, Rumania, Russia (European part), Slovakia, Spain, Sweden, Switzerland, Turkey (European part), UK, Ukraine, former Yugoslavia. North America (introduced). South America: Argentina, Brazil (introduced). TRANSMISSION: By wind-dispersed conidia. The rôle of ascospores in disease transmission is unknown, although it has been supposed that they can cause the initial stage of the disease.

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