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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.

Rossula bianca

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Rossettina

Application submitted

Lactuca sativa L. var. crispa L. · Leaf lettuce

CORA SEEDS S.R.L

PL
1 record

Rypariia x Rupestrys 4923

Active

Vitis vinifera L. · Common grape vine

Maliukina Nina Anatoliivna, Mazurenko Liudmyla Stepanivna, Kovalova Iryna Anatoliivna, Chysnikov Vitalii Stepanovych, Tulaieva Maiia Ivanivna,

UA
4 records

RIMISOL 2

Withdrawn

Helianthus annuus L. · Sunflower

INST.FIELD VEGETABLE CROP

ES
1 record

Rivairenc

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Rivairenc gris

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

RINO

Terminated

Allium cepa L. var. cepa · Onion

ZETA SEEDS S.L.

ES
1 record

Riminèse

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Royal Carpet POL

Terminated

Lobularia maritima (L.) Desv. · Sweet alyssum

Krakowska Hodowla i Nasiennictwo Ogrodnicze POLAN sp. z o.o.

PL
1 record

RM 37

Terminated

Sorghum bicolor (L.) Moench subsp. bicolor · Sorghum

Sud Cereales (FR)

FR
1 record

Regina d'estate 2

Terminated

Lactuca sativa L. · Lettuce

MINISTERO DELLE POLITICHE AGRICOLE E FORESTALI - DIREZIONE GENERALE DELLE POLITICHE AGRICOLE ED AGROINDUSTRIALI NAZIONALI

IT
1 record

Romantyk

Terminated

Helianthus annuus L. · Sunflower

Molodchenkova Olha Olehivna, Babich Valerii Ivanovych, Hanzhelo Mykola Hryhorovych, Libenko Mykola Oleksandrovych, Varenyk Borys Fedorovych, Krut`ko Vasyl` Ivanovych,

UA
2 records

Remil

Protection expired

Helianthus annuus L. · Sunflower

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

FR
2 records

Regale

Application submitted

Lactuca sativa L. · Lettuce

Gautier Semences SAS (FR)

FR
1 record

Rheinfelder

Active

Vitis vinifera L. · Common grape vine

Otto Schätzel c/o DLR Rheinhessen-Nahe-Hunsrück Dienstsitz Oppenheim

DE
1 record

Red shake

Application submitted

Lactuca sativa L. · Lettuce

MARALDI SEMENTI S.r.l.

IT
1 record

Rivairenc blanc

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

FR
1 record

Ravat blanc

Active

Vitis L. · Grapevine

INCONNU (FR)

FR
1 record

Reberger

Active

Vitis vinifera L. · Common grape vine

Dr. Rudolf Eibach / Prof. Dr. Reinhard Töpfer

DE
2 records

Réselle

Active

Vitis L. · Grapevine

Blattner Valentin (CH)

FR
1 record

RHA 46

Terminated

Helianthus annuus L. · Sunflower

PACIFICO

ES
1 record

Reichensteiner

Active

Vitis vinifera L. · Common grape vine

Hochschule Geisenheim Institut fuer Rebenzuechtung

DE
2 records

Ranok Podillia

Terminated

Brassica napus var. napus · Rapeseed

Sytnyk Ihor Danylovych, Bihun IUliia Ilinichna, Vyshnevs`kyi Pavlo Ivanovych,

UA
1 record

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