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.

HA 232CMS

Terminated

Helianthus annuus L. · Sunflower

DAKOTA UNIV.

1 record

Gringet

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

GRANISOL

Withdrawn

Helianthus annuus L. · Sunflower

LES GOURGUES-G-CARGILL

1 record

Gros Courbu

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

Gervaso

Active

Ocimum basilicum L. · Basil

GENESIS SEED LTD

1 record

Granite

Terminated

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

Paul Degreef

2 records

Grateful Red F1

Terminated

Allium cepa L. · Onion

Scott Hendricks

2 records

Genius

Active

Vicia faba L. var. equina St.-Amans · Horse bean

Norddeutsche Pflanzenzucht Hans-Georg Lembke KG

1 record

Gouais blanc

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

Fundaxy F1

Terminated

Brassica oleracea L. (White Cabbage Group) · White cabbage

P.J. Struik

2 records

Gascon

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

Garantos

Active

Vitis vinifera L. · Common grape vine

Dr. Norbert Becker im Staatl. Weinbauinstitut

1 record

Floks

Active

Helianthus annuus L. · Sunflower

Burlov Viktor Viktorovych, Burlov Viktor Vasylovych,

2 records

Fuella nera

Active

Vitis vinifera L. · Common grape vine

INCONNU (FR)

1 record

FRILICE

Terminated

Lactuca sativa L. · Lettuce

Royal Sluis Vegetables BV (NL)

1 record

Frecciaverde

Active

Lactuca sativa L. · Lettuce

MARALDI SEMENTI S.r.l.

1 record

FLORIX

Terminated

Pisum sativum L. · Pea

Nunhems Zaden BV (NL)

1 record

FLORIMI

Active

Helianthus annuus L. · Sunflower

Burlov Viktor Vasylovych

2 records

Flintstone

Withdrawn

Spinacia oleracea L. · Spinach

KWS VEGETABLES B.V.

2 records

FEREDEU

Terminated

Vitis vinifera L. · Common grape vine

DUMA MIHAIILLE IONATANOANA MARIADUMA TIBERIUDUMA MARINVANC FILIPLUCA MIRELAPOPI MORODAN CORNELIU

1 record

Galante

Active

Vitis vinifera L. · Common grape vine

Dr. Norbert Becker im Staatl. Weinbauinstitut

1 record

Funtime F1

Terminated

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

Peter Kraan

1 record

Filippok F1

Terminated

Cucumis sativus L. · Cucumber

Kyrylov Mykhailo Ivanovych, Dubinin Serhii Volodymyrovych,

2 records

Fantasol OR

Terminated

Helianthus annuus L. · Sunflower

Filipp Dzhouv

1 record

1 2 ... 204 205 206 207 208 209 210 ... 272 273 Next

Jump to page 39 78 107 117 156 195 197 217 234

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

All terms →

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.