Abaco
ActiveDaucus carota L. · Carrot
SVS HOLLAND BV , NL
NL
4 records
Diseases
Powdery mildew
Erysiphales
Powdery mildew is a fungal disease manifesting as a white web-like coating on plant organs, leading to tissue necrosis, fruit deformation, and significant crop losses.
Mentioned in descriptions 33 570 varieties reference book.
Powdery mildew is caused by ectoparasitic fungi of the order Erysiphales, which develop primarily on the surface of leaves, shoots, and fruits. The initial white web-like coating eventually densifies into "powdery" cushions, upon which fungal fruiting bodies may form as dark spots. As a result of the infection, tissues turn yellow and become necrotic, fruits may crack, and leaves drop prematurely.
The intensity of disease development depends on a complex of factors: high relative humidity, moderate temperatures, the presence of dense canopy, and excessive nitrogen nutrition. Risks increase with alternating dry and wet weather. The harmfulness of the disease is expressed in a reduction of the leaf assimilation area, deterioration of crop quality, and a decrease in the general winter hardiness of crops.
Assessment of variety resistance is conducted under field conditions at various stages of vegetation, most often during the full heading phase. To classify the degree of infection, scoring systems or intensity scales in percentages are used, where varieties with up to 10% infection are considered highly resistant (R), 11 to 40% as moderately resistant (M), and more than 41% as susceptible (S). Variety resistance is ensured by genetic mechanisms that prevent colonization by the pathogen or limit the development of its mycelium.
Breakdown by crop
Powdery Mildew of Soft Wheat
1 157
Apple Powdery Mildew
1 127
Powdery mildew of cucumber
1 031
Powdery mildew of rose
785
Powdery Mildew of Barley
758
Powdery mildew of melon
670
Tomato powdery mildew
351
Powdery mildew of zucchini
333
Powdery mildew of strawberry
281
Powdery mildew of pea
268
Powdery mildew of triticale
241
Powdery mildew of lettuce
231
Powdery mildew — sugar beet
186
Powdery mildew of pepper
185
Gooseberry powdery mildew
176
Powdery mildew of oats
176
Apple powdery mildew
153
Powdery mildew — durum wheat
151
Powdery Mildew of Black Currant
143
Grape Powdery Mildew
110
Peach Powdery Mildew
81
Powdery mildew of rye
76
Powdery Mildew of Bigleaf Hydrangea
73
Verbena powdery mildew
69
Found in these crops
Varieties that feature this in their description
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
Aberglen
Protection expiredAvena sativa L. · Oat
WELSH PLANT BREEDING AND ENVIRONMENTAL RESEARCH
IE
6 records
Adriatic
ActiveTriticum aestivum L. · Bread wheat
LEMAIRE DEFFONTAINES S.A.S.
FR
5 records
Vertis
TerminatedVerbena L. · Vervain
Stemkens, H.
Verscan
ActivePhlox paniculata L. · Garden phlox
Verschoor Janus
Vallis Clausa
ActivePlatanus x hispanica Mill. ex Münchh. · London plane
Marion Guillou c/o INRA
Ven
TerminatedHordeum vulgare L. · Barley
Graminor AS, N-2322 Ridabu
Touch Of Pink
ActiveAstilbe Buch.-Ham. ex D. Don · False goat's beard
WIN VAN VEEN
Versde
ActivePhlox paniculata L. · Garden phlox
Verschoor Janus
VLR001
ActiveRosa L. · Rose
Rumen Conev, Canada/Parminderjit Sandhu, Canada
Togano
ActiveTriticum aestivum L. · Bread wheat
Michael Winzeler
TAN98485
ActiveRosa L. · Rose
Hans-Juergen Evers
TAHI61
ActiveHibiscus moscheutos L. · Crimson-eyed rose mallow
Alain Tan
Table Mountain
Application submittedHelianthus salicifolius A. Dietr. · Willow-leaf Sunflower
Keith R.W. Hammett
SY Dolomite
ActiveHordeum vulgare L. · Barley
Syngenta Participations AG
Tunpetti
ActiveAcer pseudoplatanus L.
Paul Gagnon, Barbara Ann Gagnon
Sunmaribisu
Protection expiredVerbena L. · Vervain
Yomo Yasunori|Murakami Yasuyuki
Sunblu
Protection expiredPetunia Juss. · Petunia
Ushio Sakazaki Suntory Flowers Limited
Sugratwelve
Application submittedVitis L. · Grapevine
Newby, Harry J. Jr.
SMNPOTWG
ActivePhysocarpus opulifolius (L.) Maxim. · Ninebark
Wood Timothy D
Sunvivaro
Application submittedVerbena L. · Vervain
YOMO, YASUNORI / MIYAZAKI, KIYOSHI / YOMO, YASUNORI / MIYAZAKI, KIYOSHI
SMNSHBBL
ActiveSyringa L. · Lilac
Wood Timothy D
SAKIMP026
ActiveImpatiens New Guinea Group · New Guinea Impatiens
Sakata Seed Corporation (SCC)
Super Galena
ActiveHumulus lupulus L. · Common hop
Roger D Jeske, Joe Brulotte