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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.

Brave Heart

Active

Lactuca sativa L. · Lettuce

Seminis Vegetable Seeds

NL
2 records

ARGENFOR 180 FS

Application submitted

Sorghum x drummondii (Steud.) Millsp. & Chase · Sudangrass

Argenetics Semillas

IT
2 records

Ruby Ann

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

ABZ Aardbeien uit Zaad Holding B.V.

3 records

89-001

Active

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

Kees Reinink

UA
3 records

12002 R

Terminated

Helianthus annuus L. · Sunflower

Dobroudja Agricultural Institute - General Toshevo (BG)

BG
2 records

BTS 1915

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Betaseed

DE
2 records

B 815

Terminated

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

PIONEER HI-BRED INTERNATIONAL

ES
2 records

89-004

Active

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

Kees Reinink

UA
3 records

10023 R

Terminated

Helianthus annuus L. · Sunflower

Dobroudja Agricultural Institute - General Toshevo (BG)

BG
2 records

PAL - 0117

Active

Helianthus annuus L. · Sunflower

PARVI NIKOLAJ

UA
3 records

LG 56.65

Active

Helianthus annuus L. · Sunflower

Limagrain Europe, Saint Beauzire (FR)

HR
2 records

AS-87

Active

Helianthus annuus L. · Sunflower

Jocie Sinisa

UA
5 records

Merlot

Active

Vitis vinifera L. · Common grape vine

BG DE ES FR MT SK
10 records

Monterey

Protection expired

Brassica oleracea L. (Broccoli Group) · Broccoli

CZ HR HU NL PL
9 records

Ugni blanc

Active

Vitis vinifera L. · Common grape vine

BG ES FR MT
8 records

Cardinal

Active

Vitis vinifera L. · Common grape vine

BG ES FR MT
8 records

Merlot

Active

Vitis L. · Grapevine

CZ HU RO SI
7 records

Italia

Active

Vitis vinifera L. · Common grape vine

BG ES FR MT
7 records

Chardonnay

Active

Vitis L. · Grapevine

CZ HU RO SI
6 records

Salinas

Active

Cucumis sativus L. · Cucumber

CZ HU NL SK
6 records

Pinot gris

Active

Vitis vinifera L. · Common grape vine

BG ES FR MT
7 records

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