Uncinula necator. [Descriptions of Fungi and Bacteria].

1967 ◽  
Author(s):  
J. N. Kapoor
Keyword(s):  
Powdery Mildew ◽  
Vitis Vinifera ◽  
Geographical Distribution ◽  
World Wide ◽  
Uncinula Necator

Abstract A description is provided for Uncinula necator. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Vitis spp., chiefly Vitis vinifera; also on Parthenocissus spp., Ampelopsis spp. DISEASE: Powdery mildew of vine. GEOGRAPHICAL DISTRIBUTION: World-wide. TRANSMISSION: Conidia and mycelium overwinter in diseased buds, fallen berries or on overwintered stems. Cleistothecia, when formed, are capable of overwintering (Blumer, 1967).

Erysiphe pisi. [Descriptions of Fungi and Bacteria].

1967 ◽  
Author(s):  
J. N. Kapoor
Keyword(s):  
Powdery Mildew ◽  
Geographical Distribution ◽  
Lens Culinaris ◽  
World Wide ◽  
Erysiphe Pisi ◽  
Lens Esculenta

Abstract A description is provided for Erysiphe pisi. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Papilionaceae, chiefly on Pisum, Dorcynium, Medicago and Vicia; also on Lupinus spp., Lens esculenta[Lens culinaris], Trifolium dubium and? Astragalus alpinus (Blumer, 1967). DISEASE: Powdery mildew of pea. GEOGRAPHICAL DISTRIBUTION: World-wide. TRANSMISSION: Internally seed borne (15: 338).

Microsphaera penicillata. [Descriptions of Fungi and Bacteria].

1968 ◽  
Author(s):  
K. G. Mukerji
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
Geographical Distribution ◽  
World Wide ◽  
Late Summer ◽  
Erysiphe Pisi ◽  
Temperature And Humidity ◽  
Young Leaves ◽  
Dry Seasons

Abstract A description is provided for Microsphaera penicillata. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On species of Alnus, Betula, Syringa, Lathyrus, sweet peas and numerous other hosts (Saknon, 1900; Stevens, 1925; 39: 739; 41: 175) DISEASES: Powdery mildew of alder and lilac. Forms a white to grey floury appearance on the surface of broad leaves of many hard wood trees. It is more prevalent on sweet peas than Erysiphe pisi (CMI Descript. 155) in North America in spring when temperature and humidity are fluctuating. The foliage may be malformed, dropping prematurely or drying out and shrivelling. It is also prevalent on lilac in late summer and autumn, sometimes in dry seasons almost completely covering the foliage, but generally too late in the season to cause serious damage. Young leaves are more susceptible. GEOGRAPHICAL DISTRIBUTION: World-wide on alder and lilac and occasionally occurring on numerous other hosts. Distributed generally in North America and Europe, also reported from Chile, China, India and Japan (Salmon, 1900, 39: 739; 41: 175). TRANSMISSION: Spores wind borne.

Sphaerotheca fuliginea. [Descriptions of Fungi and Bacteria].

1967 ◽  
Author(s):  
J. N. Kapoor
Keyword(s):  
Glycine Max ◽  
Powdery Mildew ◽  
Geographical Distribution ◽  
World Wide ◽  
Solanum Melongena ◽  
Sphaerotheca Fuliginea ◽  
Hibiscus Esculentus

Abstract A description is provided for Sphaerotheca fuliginea. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On numerous genera of Compositae, Cucurbitaceae and Scrophulariaceae. Also on Helianthemum spp. (Cistaceae); Arabis spp., Braya spp., Capscila spp., Cardaminc spp., Draba spp., Parrya spp. (Cruciferae); Dipsacus spp. (Dipsacaceae); Astragalu, spp., Glycine max, Phascolus spp., Rhynchosia spp., Vigna spp.(Leguminosae); Plantago spp. (Plantaginaceae); Hibiscus esculentus (Malvaceae); Hyoscyarnus niger, Mandragora officinalis, Petunia spp., Physalis spp., Solanum melongena (Solanaceae). (Blumer, 1967; Hirata, 1966). DISEASE: Powdery mildew of cucurbits. GEOGRAPHICAL DISTRIBUTION: World-wide. TRANSMISSION: Not known.

Leveillula taurica. [Descriptions of Fungi and Bacteria].

1968 ◽  
Author(s):  
K. G. Mukerji
Keyword(s):  
Powdery Mildew ◽  
Geographical Distribution ◽  
Central Europe ◽  
Mediterranean Region ◽  
World Wide ◽  
Near East ◽  
Gossypium Barbadense ◽  
Cyamopsis Tetragonoloba ◽  
Leveillula Taurica ◽  
Trees And Shrubs

Abstract A description is provided for Leveillula taurica. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Gossypium barbadense, G. hirsutum and Cyamopsis psoraloides[Cyamopsis tetragonoloba]. Also on many other trees and shrubs belonging to the Leguminoseae, Malvaceae and Euphorbiaceae (Salmon, 1900; Blumer, 1933; Tarr, 1955; 37: 521). DISEASES: Powdery mildew of cotton and guar. The host becomes completely covered with the fungus which mostly forms conidia and rarely cleistothecia. Severe attacks cause defoliation. Komarov (1895) reported that in Seravschan-Turkestan every plant of the steppes up to 1219-1524 m is attacked. The fungus does not occur beyond 1829 m. GEOGRAPHICAL DISTRIBUTION: World wide but mainly in the mediterranean region, Central Europe and the Near East (Dennis, 1960; CMI Map 217; 37: 400). TRANSMISSION: Wind borne. In the Sudan the pathogen over-summers on Euphorbia heterophylla, a common weed (37: 521).

Release, germination, and pathogenicity of ascospores of Uncinula necator under controlled conditions

1998 ◽  
Vol 76 (5) ◽  
pp. 777-781 ◽  
Author(s):  
F Jailloux ◽  
T Thind ◽  
M Clerjeau
Keyword(s):  
Powdery Mildew ◽  
Vitis Vinifera ◽  
Storage Conditions ◽  
Vitis Vinifera L ◽  
Uncinula Necator ◽  
Grapevine Powdery Mildew ◽  
Germination Ability ◽  
Ascospore Release ◽  
Probable Role ◽  
Leaf Disks

A laboratory technique was standardized for studying the release, maturation, germination, and pathogenicity of ascospores of Uncinula necator (Schw.) Burr. Surface disinfestation and wetting of grape (Vitis vinifera L.) leaf disks bearing cleistothecia collected in the vineyard before incubation in a humid chamber for 48 h at 20°C were found essential for obtaining the release of ascospores (8 ascospores/cm2). Storage conditions involving periodic wetting treatments of cleistothecia at 5°C during 110 days were necessary to induce both ascospore release (80 ascospores/cm2) and germination ability (62%). The matured ascospores were pathogenic on healthy leaf disks at 20°C indicating their probable role as a primary inoculum source. This technique can be helpful in studying the inheritance of characteristics such as pathogenicity and fungicidal resistance.Key words: cleistothecia, ascospores, maturation, germination, pathogenicity, Uncinula necator, grapevine, powdery mildew.

Development of SCAR markers linked to powdery mildew (Uncinula necator) resistance in grapevine (Vitis vinifera L. and Vitis sp.)

2006 ◽  
Vol 19 (2) ◽  
pp. 103-111 ◽  
Author(s):  
Murat Akkurt ◽  
Leocir Welter ◽  
Erika Maul ◽  
Reinhard Töpfer ◽  
Eva Zyprian
Keyword(s):  
Powdery Mildew ◽  
Vitis Vinifera ◽  
Vitis Vinifera L ◽  
Uncinula Necator ◽  
Scar Markers ◽  
Vitis Sp

scholarly journals Foliar Sprays of Clay Reduce the Severity of Powdery Mildew on Long English Cucumber and Wine Grapes

HortScience ◽  
2001 ◽  
Vol 36 (5) ◽  
pp. 934-936 ◽  
Author(s):  
David L. Ehret ◽  
Carol Koch ◽  
Jim Menzies ◽  
Peter Sholberg ◽  
Tim Garland
Keyword(s):  
Powdery Mildew ◽  
Vitis Vinifera ◽  
Cucumis Sativus ◽  
Disease Severity ◽  
Fruit Quality ◽  
Leaf Surface ◽  
Uncinula Necator ◽  
Sphaerotheca Fuliginea ◽  
Wine Grapes ◽  
Foliar Sprays

Foliar sprays of a nonswelling chlorite mica clay were applied to leaves of greenhouse-grown long English cucumber (Cucumis sativus L.) plants, either before or after an artificial inoculation with powdery mildew [Sphaerotheca fuliginea (Schlech.:Fr.) Poll.] and to field-grown wine grapes (Vitis vinifera L.) before natural inoculation with powdery mildew [Uncinula necator (Schwein.) Burrill]. In all cases, the clay sprays did not eradicate the pathogen, but resulted in significant reductions in disease severity. In cucumber, a single spray of 0.5% clay reduced colony numbers on leaves by up to 60%. Spraying after inoculation was generally more effective than spraying before inoculation. In grapes, repeated sprays of either 2% or 4% clay were applied through the season to `Reisling' and `Chancellor' vines. Four percent clay reduced the amount of leaf surface covered by mildew by 22% in `Reisling' and 51% in `Chancellor'. Both concentrations reduced the incidence of mildew on clusters and canes. No treatment effects were observed on fruit quality. Our results demonstrate that foliar sprays of clay can reduce the severity of Sphaerotheca fuliginea and Uncinula necator on cucumbers and grapes, respectively.

scholarly journals Suppression of Grapevine Powdery Mildew by a Mycophagous Mite

Plant Disease ◽  
2005 ◽  
Vol 89 (12) ◽  
pp. 1331-1338 ◽  
Author(s):  
Heather S. Melidossian ◽  
Robert C. Seem ◽  
Greg English-Loeb ◽  
Wayne F. Wilcox ◽  
David M. Gadoury
Keyword(s):  
Powdery Mildew ◽  
Vitis Vinifera ◽  
Uncinula Necator ◽  
Laboratory Studies ◽  
Rapid Loss ◽  
Infection Efficiency ◽  
Grapevine Powdery Mildew ◽  
Grape Powdery Mildew

Orthotydeus lambi reduced the severity of grape powdery mildew (Uncinula necator) on fruit and foliage of Vitis vinifera ‘Chardonnay’ and ‘Riesling’ in repeated field and laboratory trials. Vines were infested with O. lambi at two densities (5 or 30 mites per leaf) at each of two times (2 to 3 weeks prebloom and 1 week postbloom). Overall, powdery mildew on the berries and foliage was suppressed by early (prebloom) mite releases at both densities, but only by the higher density in late (postbloom) releases. In a separate trial, when foliage was infested at 30 mites per leaf but mites were excluded from certain fruit clusters, severity of powdery mildew was significantly reduced on the mite-free clusters of mite-infested shoots. Thus, O. lambi may suppress powdery mildew on the fruit by reducing inoculum from foliar infections. In laboratory studies, both immature and mature mites reduced infection efficiency, colony expansion, and sporulation of the mildew colonies; but immature mites were more voracious feeders, consuming more pathogen biomass per unit of mite biomass. Mites tore at the mycelium and conidia with their palps during feeding, leading to leakage, rapid loss of hyphal turgor, and collapse of hyphae.

Erysiphe polygoni. [Descriptions of Fungi and Bacteria].

1976 ◽  
Author(s):  
A. Sivanesan
Keyword(s):  
Powdery Mildew ◽  
Geographical Distribution ◽  
World Wide ◽  
Initial Infection ◽  
Erysiphe Polygoni

Abstract A description is provided for Erysiphe polygoni. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Polygonum and Rumex. DISEASE: Powdery mildew. GEOGRAPHICAL DISTRIBUTION: World-wide. TRANSMISSION: Initial infection is perhaps by persistent mycelium and wind-borne conidia. Ascospores from overwintered cleistothecia may also start new infections.

Erysiphe cruciferarum. [Descriptions of Fungi and Bacteria].

1970 ◽  
Author(s):  
T. J. Purnell
Keyword(s):  
Powdery Mildew ◽  
Geographical Distribution ◽  
World Wide ◽  
Erysiphe Cruciferarum ◽  
White Mycelium

Abstract A description is provided for Erysiphe cruciferarum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Chiefly on members of the Cruciferae but also reported on Papaveraceae (Junell, 1961). DISEASE: Powdery mildew of swedes and tumips. The first signs of mildew consist of small patches of a thin white mycelium arising at various places on the leaf, often appearing first on the under surface. These soon merge forming larger areas of mycelium. The leaves of the swede, B. napus, may support heavy mildew growth for many weeks before they become chlorotic and die. GEOGRAPHICAL DISTRIBUTION: World-wide. TRANSMISSION: Wind-borne conidia. The method of ovewintering is uncertain but myelium may be able to survive on winter Brassica spp. in the form of 'subinfections' (Searle, 1919).

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