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Diseases

Downy mildew

Peronosporaceae

Downy mildew is a dangerous plant disease caused by oomycetes under high humidity conditions. It manifests as a characteristic growth on the underside of leaves and spotting, which leads to rapid death of vegetative mass and yield reduction.

Mentioned in descriptions 16 384 varieties reference book.

Downy mildew is a group of diseases caused by specialized oomycetes. The disease manifests as the appearance of yellowish or brown angular spots on the upper side of the leaves, delimited by veins. On the underside of the leaf, under humid conditions, a characteristic grey-violet, white, or bluish fuzzy growth forms. Pathogen development leads to yellowing and drying of leaves, stunting of plants, and deformation of fruits, which, in the case of high pathogen aggressiveness, can lead to crop death in a short period.

Disease development depends directly on meteorological conditions and agronomic practices. The pathogen prefers a cool, humid environment, with critical risk factors being heavy dew, fog, prolonged rain, high air humidity, and crop density. Optimal conditions for infection include nighttime temperatures in the range of +13…+20°C and the presence of droplet moisture on the leaf surface for more than 6 hours.

Assessment of variety resistance during variety testing is based on phytopathological recording of the degree of leaf damage, specialized screening of collection samples, and molecular analysis methods using DNA markers to find genetic donors of resistance. In production, a distinction is made between genetically resistant varieties possessing specific Dm-genes and tolerant forms capable of maintaining yield under infection due to active vegetative mass formation. Since new pathogen races can overcome genetic resistance, varieties require regular monitoring and renewal.

Sources10

Breakdown by crop

Downy mildew of lettuce 2 007 Downy mildew of sunflower 905 Downy Mildew of Cucumber 394 Downy mildew of spinach 387 Downy Mildew of Pea 159 Downy Mildew (Peronospora) — Soybean 65 Downy Mildew of Hops 60 Downy mildew — Onion 59 Downy Mildew of Grapevine 58 Downy Mildew of Melon 48 Downy mildew — bulb onion 48 Downy mildew of radish 47 Downy mildew of basil 46 Downy mildew — broccoli 43 Downy Mildew of Grapevine 33 Downy mildew — New Guinea impatiens 32 Downy mildew of rapeseed 24 Downy mildew of zucchini 20 Downy mildew of wall rocket 19 Downy mildew — cauliflower 18 Downy mildew — lettuce 18 Downy mildew — head lettuce 18 Downy Mildew — Impatiens walleriana 18 Downy mildew — cabbage 17

Found in these crops

Lettuce 2 054 Grapevine 1 066 Sunflower 920 Common grape vine 514 Cucumber 414 Spinach 405 Pea 168 Common hop 77 Soybean 71 Onion 61 Onion 51 Melon 51

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.

Savagnin blanc

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

SC 529

Terminated

Helianthus annuus L. · Sunflower

SEMILLAS CARGILL, S.A.

ES
1 record

Savvatiano

Application submitted

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Saphir

Active

Humulus lupulus L. · Common hop

Herbert Ehrmaier

DE
1 record

SERELIA

Active

Helianthus annuus L. · Sunflower

Joel Meunier

UA
1 record

Saphira

Active

Vitis vinifera L. · Common grape vine

Hochschule Geisenheim University Institut für Pflanzenzüchtung Herrn Prof. Dr. Ernst Rühl

DE
2 records

Selenor

Active

Vitis L. · Grapevine

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

FR
1 record

Sander F1

Active

Cucumis sativus L. · Cucumber

Andzhei Rostvorovskyi

UA
2 records

Samorodok F1

Terminated

Cucumis sativus L. · Cucumber

Muzhylko Viktor Valentynovych, Neporozhnia IEvheniia Oleksiivna, Pluzhnikova Liudmyla IEhorivna, Lisitsina Rima Petrivna, Lisitsyn Volodymyr Mykolaiovych,

UA
1 record

Safrane F1

Active

Allium cepa L. · Onion

Ger Bimsdeboer

UA
1 record

Rusensko bez seme

Active

Vitis vinifera L. · Common grape vine

Zdravko Zankov, Ivan Todorov, Kunyu Stoev

BG
1 record

Saturno F1

Terminated

Daucus carota L. · Carrot

Robert Prieur

UA
1 record

Russkii stil` F1

Terminated

Cucumis sativus L. · Cucumber

Havrysh Serhii Fedorovych, Dubinin Serhii Volodymyrovych,

UA
2 records

RUSALKA 1

Withdrawn

Vitis vinifera L. · Common grape vine

MINCHO GUENCHEV KONDAREV

ES
1 record

RS185

Terminated

Helianthus annuus L. · Sunflower

GROAGRI SEED CO

ES
2 records

RP 521

Terminated

Helianthus annuus L. · Sunflower

RHONE POULENC AGROCHIMIE (FR)

FR
1 record

Rubin tairovs`kyi

Active

Vitis vinifera L. · Common grape vine

Ovchynnikov Hryhorii Petrovych, Tarakhtii Liudmyla Ivanivna, Abliazova Aia Pavlivna, Tulaieva Maia Ivanivna, Dokuchaieva IEvheniia Mykolaivna,

UA
1 record

Rondo

Active

Vitis vinifera L. · Common grape vine

Prof. Dr. H. Becker

DE
2 records

Romulus

Withdrawn

Vitis L. · Grapevine

R.Gilg et Succ. SA (FR)

FR
1 record

Rumours

Active

Lactuca sativa L. var. capitata L. · Head lettuce

Ger Beemsterboer

UA
1 record

Rodničiok

Terminated

Cucumis sativus L. · Cucumber

FGUP ,,Volgogradsortsemovošč"

LT
1 record

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