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.

Balglimite

Active

Impatiens walleriana Hook. f. · Busy Lizzie

SIMONE E. CRAIN

2 records

Balchryite

Active

Buddleja L. · Buddleia

Trees Scott C

2 records

20-40-26

Active

Ocimum basilicum L. · Basil

Rutgers, The State University of New Jersey / Rutgers, The State University of New Jersey / Rutgers, The State University of New Jersey

2 records

Apulia

Active

Vitis L. · Grapevine

Stefano Somma

2 records

Anastazia

Active

Diplotaxis tenuifolia (L.) DC. · Perennial wall-rocket

Enza Zaden Beheer B.V.

2 records

Amaze

Terminated

Lactuca sativa L. · Lettuce

VILMORIN-MIKADO USA

2 records

Admiral

Active

Humulus lupulus L. · Common hop

Peter Darby

3 records

ES Foximis CL

Withdrawn

Helianthus annuus L. · Sunflower

EURALIS SEMILLAS, S.A.

BG ES

2 records

Sofiia

Active

Fagopyrum esculentum Moench · Buckwheat

Lyubov Taranenko c/o Antaria GmbH / Oleg Yatsyshen c/o Antaria GmbH / Pavio Taranenko c/o Antaria GmbH / Oksana Drozd c/o Antaria GmbH

DE UA

3 records

Teo

Active

Helianthus annuus L. · Sunflower

Frederic Poujaud

IT UA

3 records

MAS 87F

Withdrawn

Helianthus annuus L. · Sunflower

Maisadour Semences, FR

CZ FR

2 records

Faraon AM

Active

Helianthus annuus L. · Sunflower

Hostiev IEvhen IUriiovych

3 records

Zysk

Active

Triticum aestivum L. · Bread wheat

Lyfenko Lina Semenivna, Bosakovska Nataliia IUriivna, Nakonechnyi Mykola IUriiovych, Narhan Tetiana Pavlivna, Fedchenko Volodymyr Pavlovych, Yeryniak Mykola Ivanovych, Lyfenko Savelii Pylypovych,

3 records

Zlatson

Active

Helianthus annuus L. · Sunflower

Borovs`ka Iryna IUriivna, Petrenkova Vira Pavlivna, Brahin Oleksandr Mykolaiovych, Tymchuk Serhii Mykhailovych, Satarov Oleksandr Zainulovych, Syvenko Oleksandr Anatoliiovych, Popova Ol`ha Andriivna, Kolomatska Valeriia Pavlivna, Syvenko Valentyna Ivanivn

3 records

Skh 1008 A kh Kh 1007 B

Terminated

Helianthus annuus L. · Sunflower

Shepilov Borys Petrovych, Popova Ol`ha Andriivna, Petrenkova Vira Oleksandrovych, Veselyi Vitalii Oleksandrovych, Kuz`myshena Nadiia Viktorovna, Syvenko Valentyna Ivanivna, Alad`ina Zoia Kyrylivna, Makliak Kateryna Mykolaivna, Kyrychenko Viktor Vasylovych

3 records

Status

Active

Helianthus annuus L. · Sunflower

GORBAChENKO FEDOR IVANOVICh / GORBAChENKO OLEG FEDOROVICh / USATENKO TAT'YaNA VASIL'EVNA / LUChKIN NIKOLAJ SERGEEVICh / BURLYaEVA EVGENIYa GRIGOR'EVNA / ZhITNIK NADEZhDA ALEKSANDROVNA / GORBAChENKO VALENTINA DANILOVNA

4 records

SKh 1008 A

Application submitted

Helianthus annuus L. · Sunflower

Kryvosheieva Olena Vatslavivna, Brahin Oleksandr Mykolaiovych, Veselyi Vitalii Oleksandrovych, Kuzmyshena Nadiia Viktorivna, Syvenko Valentyna Ivanivna, Makliak Kateryna Mykolaivna, Alad`ina Zoia Kyrylivna, Kyrychenko Viktor Vasyl`ovych,

5 records

Redstoun

Active

Brassica napus var. napus · Rapeseed

Breus Oksana Serhiivna, Davydiuk Ihor Mykolaiovych, Koval`chuk Zoreslava Volodymyrivna, Parii IUliia Oleksandrivna, Parii Myroslav Fedorovych, Parii IAroslav Fedorovych, Parii Fedir Mykytovych,

3 records

Poltava

Active

Glycine max (L.) Merr. · Soybean

Militsa Khrustich, Ihor Miladinovich,

3 records

Parker

Active

Brassica napus var. napus · Rapeseed

Solomenko Andrii Ivanovych, Breus Oksana Serhiivna, Parii IUliia Oleksandrivna, Koval`chuk Zoreslava Volodymyrivna, Parii Myroslav Fedorovych, Parii IAroslav Fedorovych,

3 records

NS H 8001

Active

Helianthus annuus L. · Sunflower

Terzic Sreten, Radeka Ilija, Jockovic Milan, Cvejic Sandra, Jocic Sinisa,

3 records

NS H 6342

Active

Helianthus annuus L. · Sunflower

Dusanic Nenad, Miklic Vladimir, Malidza Goran, Cvejic Sandra, Jocic Sinisa,

3 records

NS H 978

Active

Helianthus annuus L. · Sunflower

Dusanic Nenad, Miladinovic Dragana, Cvejic Sandra, Cvejic Sandra, Jocic Sinisa,

3 records

NS H 2649

Active

Helianthus annuus L. · Sunflower

Miklic Vladimir, Dusanic Nenad, Malidza Goran, Cvejic Sandra, Jocic Sinisa,

3 records

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Diseases

Powdery mildew 33 570
Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064
Grey mold 7 316

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.