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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.

Sources10

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

Bread wheat 1 186 Apple 1 130 Cucumber 1 080 Grapevine 980 Rose 785 Barley 762 Melon 681 Common grape vine 512 Tomato 361 Field pumpkin 335 Garden strawberry 280 Pea 279

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.

Betulia New Pink

Terminated

Begonia x hiemalis Fotsch · Elatior Begonia

LUBBERTUS H.KOPPE

1 record

Balsukafus

Active

Phlox paniculata L. · Garden phlox

Grace H Kim

1 record

Balkaposin

Withdrawn

Phlox paniculata L. · Garden phlox

Christa Kievit^^^Karl F. Batschke

2 records

Balangdeum

Terminated

Angelonia Bonpl. · Angelonia

SCOTT C TREES

1 record

1LI

Withdrawn

Lagerstroemia indica L. · Crape myrtle

James Berry^^^Capstone Plants Inc.

1 record

#18LI

Active

Lagerstroemia indica L. · Crape myrtle

James Berry^^^Capstone Plants Inc.

1 record

Balazlipi

Terminated

Verbena L. · Vervain

SCOTT C TREES

1 record

Balazgagic

Terminated

Verbena L. · Vervain

SCOTT C TREES

1 record

Atomic Pink Ray

Terminated

Veronica L. · Speedwell

A. VERSCHOOR HORTICULTURE IMPORT-EXPORT B.V

1 record

Atomic Amethyst Ray

Terminated

Veronica L. · Speedwell

A. VERSCHOOR HORTICULTURE IMPORT-EXPORT B.V

1 record

Akoya

Active

Humulus lupulus L. · Common hop

Alexander Feiner

1 record

ACPETDEL

Terminated

Monarda L. · Bee balm

COLLICUT LYNN M.^^^Campbell G. Davidson

1 record

09PHL0703

Terminated

Phlox L. · Phlox

Ushio Sakazaki

1 record

17-100-06

Application submitted

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Flevo Berry Holding B.V.

1 record

Livius

Withdrawn

Triticum aestivum L. · Bread wheat

Semundo B.V.

NL
2 records

Shulyndinska

Terminated

Triticum durum Desf. · Durum wheat

Leonov Oleh IUriiovych, Cherednychenko Viktor Mykolaiovych, Riabchun Nataliia Ivanivna, Chernobab Raisa Andriivna, Suvorova Kkateryna IUriivna, Shcypak Hennadii Vasylovych,

UA
2 records

OLBENA

Withdrawn

Avena sativa L. · Oat

SEMILLAS BATLLE, S.A.

ES
1 record

Jole

Application submitted

Triticum aestivum L. · Bread wheat

GENETIC SERVICES S.R.L.

IT
1 record

Bilotserkivska yuvileina

Active

Triticum aestivum L. · Bread wheat

Makarenko Nataliia Mykolaivna, Chaika Anatolii Mykolaiovych, Dubova Oksana Anatoliivna, Burdeniuk-Tarasevych Larysa Antonivna,

UA
2 records

Faktor odeskyi

Active

Triticum durum Desf. · Durum wheat

Vasyliev Oleksii Anatoliiovych, Rybalka Oleksandr Illich, Albul Anatolii Oleksiiovych, Avsenin Viacheslav Ivanovych, Fait Viktor Ivanovych, Palamarchuk Anatolii Ivanovych,

UA
2 records

Zorepad bilotserkivs`kyi

Active

Triticum aestivum L. · Bread wheat

Chaika Anatolii Mykolaiovych, Dubova Oksana Anatoliivna, Burdeniuk-Tarasevych Larysa Antonivna,

UA
2 records

Zhizel`

Active

Triticum durum Desf. · Durum wheat

Fomaniuk Valentyna Andriivna, Koliuchyi Vasyl` Trokhymovych, Fedchenko Hanna Vasylivna, Solona Valentyna Iosypivna, Vlasenko Volodymyr Anatoliiovych,

UA
2 records

Zenit

Active

Triticum L. · Wheat

BORASIO ERCOLE

IT
1 record

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