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Diseases

Late blight

Phytophthora infestans

Late blight is a dangerous disease of solanaceous crops caused by an oomycete, which manifests as the appearance of spots on leaves, stems, and tubers. The development of the disease is triggered by high humidity and moderate temperatures, which can lead to significant crop losses.

Mentioned in descriptions 6 798 varieties reference book.

Affected plants develop dirty-brown spots, often accompanied by a whitish mold on the underside of the leaf, while elongated dark-brown spots appear on the stems. Tubers show hard, sunken brown spots, and the internal tissue exhibits a characteristic rust-brown discoloration upon cutting.

Epiphytotics develop under conditions of high air humidity around 90% and alternating warm days with cool nights. The presence of free moisture, such as dew or fog, is a critical factor for rapid spore germination, which allows the infection to spread across the field in 10–15 days.

In breeding, a distinction is made between specific vertical resistance, controlled by R-genes, and field horizontal resistance, which is considered more reliable due to its polygenic nature and ability to slow down pathogen development. Varieties are evaluated using a 9-point scale; however, the resistance level of the foliage does not always coincide with that of the tubers, requiring comprehensive analysis during variety testing.

Sources10

Breakdown by crop

Potato late blight 1 396 Tomato Late Blight 273 Phytophthora root rot of strawberry 99 Phytophthora Root and Stem Rot of Soybean 61 Phytophthora Root Rot of Alfalfa 41 Phytophthora blight of pepper 41 Apple Phytophthora Rot 24 Phytophthora Root Rot of Raspberry 21 Apple Phytophthora Rot 20 Tomato Late Blight 17 Citrus Phytophthora 17 Plum Phytophthora root rot 15 Phytophthora blight — hybrids between Citrus x aurantium L. x Citrus trifoliata L. 13 Strawberry Phytophthora root rot 13 Phytophthora Root Rot of Blueberry 11 Phytophthora root rot of sweet chestnut 9 Phytophthora blight — Leek 7 Phytophthora root rot of sour cherry 6 Phytophthora root rot of paradise apple 6 Avocado Phytophthora Root Rot 6 Peach Phytophthora Root Rot 5 Phytophthora root rot of Vaccinium 5 Late Blight of Eggplant 4 Phytophthora root rot of Prunus amygdalus x Prunus persica 4

Found in these crops

Potato 1 394 Tomato 276 Garden strawberry 124 Soybean 64 Bell pepper 56 Alfalfa 41 Red raspberry 34 Apple 26 Sweet chestnut 25 Citrus 22 Apple 19 Tomato 16

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.

Avimag

Active

Prunus persica (L.) Batsch · Peach

JEAN-CLAUDE BOUSSET|ELISABETH KALLAY

ES FR HU IT
8 records

Anaïs

Active

Solanum tuberosum L. · Potato

GROCEP SICA

BG FR HR MT
11 records

Cara

Active

Solanum tuberosum L. · Potato

Teagasc

ES IE LU MT
11 records

Avanti

Active

Solanum tuberosum L. · Potato

STET Holland B.V.

FR IT NL
11 records

Zorba

Active

Solanum tuberosum L. · Potato

STOVER PRODUKTION GMBH

DE ES IT
9 records

Tebina

Active

Solanum tuberosum L. · Potato

Temmerman Jacques C.M.J.

BE LU SI
7 records

Royata KWS

Active

Solanum tuberosum L. · Potato

Peter Leonard Oldenkamp

HR NL UA
10 records

Sunshine

Active

Solanum tuberosum L. · Potato

Solana, D

FR NL UA
10 records

Mustang

Active

Solanum tuberosum L. · Potato

NIEDEROSTERREICHISCHE SAATBAUGENOSSENSCHAFT, AT

HR NL UA
13 records

Patriot

Active

Vaccinium corymbosum L. · Highbush blueberry

Szkola Glowna Gospodarstwa Wiejskiego

NL PL UA
13 records

Melanie

Active

Solanum tuberosum L. · Potato

Grocep (FR)

DE FR NL
11 records

Marta

Active

Solanum tuberosum L. · Potato

SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4

CZ DE PL
10 records

Fakse

Active

Solanum tuberosum L. · Potato

Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel

DK EE PL
10 records

Elodie

Active

Solanum tuberosum L. · Potato

JEAN MARC ABHIVEN_

BG FR UA
8 records

Bellini

Active

Solanum tuberosum L. · Potato

Stet Holland BV (NL)

HR NL SI
10 records

Adretta

Active

Solanum tuberosum L. · Potato

NORIKA NORDRING-KARTOFFELZUCHTUND VERMEHRUNGS GmbH

DE LV SK
9 records

Barna

Active

Solanum tuberosum L. · Potato

Teagasc Oak Park Research Centre

ES IE NL
10 records

Agila

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE LT LU
9 records

Amigo

Active

Solanum tuberosum L. · Potato

Station de Recherche du Comité Nord G.I.E.

DE FR NL
12 records

Alpha

Active

Solanum tuberosum L. · Potato

FRIESE MIG V.LANDBOU.

ES IT MT
7 records

Wendy

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE UA
11 records

Rosagold

Active

Solanum tuberosum L. · Potato

Sjefke Allefs

NL UA
11 records

Saviola

Active

Solanum tuberosum L. · Potato

Lantmännen Seed B.V.

NL UA
9 records

Sissi

Active

Solanum tuberosum L. · Potato

Bavaria Saat GbR

DE FR
8 records

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