Ditosse
ActivePhlox paniculata L. · Garden phlox
Tonies Hubertus Josephus|Noordwijkerhout, NL
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.
Early Joy
ActiveEuphorbia pulcherrima Willd. ex Klotzsch · Poinsettia
OGLEVEE LTD
Flavia
ActiveFragaria x ananassa Duchesne ex Rozier · Garden strawberry
Michelangelo Leis^^^Alessio Martinelli
Dumka
ActiveLactuca sativa L. · Lettuce
WASILEWSKA IRENA
Duealkomidbu
ActiveCalibrachoa Cerv. · Calibrachoa
Tobias Dümmen
Florence
ActiveAstrantia major L. · Masterwort
Oudshoorn Hubertus Gerardus|Rijpwetering, NL
DAVROU01
ActiveSpiraea japonica L. f. · Japanese meadowsweet
Jean-Paul Davasse
Fantasia
ActiveHibiscus L. · Hibiscus
FLEMING DAVID W.^^^Gretchen Zwetzig
Cosmopolitan
ActivePhlox paniculata L. · Garden phlox
Verschoor Jan|Haarlem, NL
Doroforgowed
ActiveRosa L. · Rose
PHILIPPE VEYS
Evipo003
ActiveClematis L. · Clematis
Poulsen Roser A/S^^^EVISON RAYMOND J. LTD
Crown Jewels
ActiveHibiscus L. · Hibiscus
FLEMING DAVID W.^^^Gretchen Zwetzig
Festival
ActiveFragaria x ananassa Duchesne ex Rozier · Garden strawberry
UNIVERSITY OF FLORIDA, GULF COAST RESEARCH STATION
Dixie Sun
ActiveEchinacea Moench. · Coneflower
Korlipara Harini
Ditosdre
ActivePhlox paniculata L. · Garden phlox
Tonies Hubertus Josephus|Noordwijkerhout, NL
Ditomsur
ActivePhlox paniculata L. · Garden phlox
Tonies Hubertus Josephus|Noordwijkerhout, NL
Dilago
ActiveTriticum aestivum L. · Bread wheat
Agroscope
Columbus
ActiveHumulus lupulus L. · Common hop
Lewis, Gregory K.|Yakima, WA / Zimmermann, Charles E.|Prosser, WA / Hazenberg, Henry|Kennewick, WA (Rule 47)
Dark Eyes
ActiveVerbascum L. · Mullein
Korlipara Harini|Canby, OR, US
Casana
TerminatedTriticum aestivum L. · Bread wheat
Michael Winzeler Agroscope
Cadlimo
ActiveTriticum aestivum L. · Bread wheat
Agroscope
Doromomtum
ActiveRosa L. · Rose
Silvan Kamstra
Crystal
Application submittedPisum sativum L. · Pea
CRITES-MOSCOW GROWERS INC.
Duempflabu
ActiveVerbena L. · Vervain
Tobias Dümmen