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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 Hybrids between Citrus x aurantium L. x Citrus trifoliata L. 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.

Pyros

Active

Solanum lycopersicum L. · Tomato

CLAUSE, S.A.

ES FR NL SI
5 records

Saint-Pierre

Active

Solanum lycopersicum L. · Tomato

Semenarna Ljubljana, SI

BG FR HR SI
5 records

O'sirene

Active

Solanum tuberosum L. · Potato

Federation des Syndicats Bretons (FR)

DK ES FR NL
7 records

Prevalent

Protection expired

Solanum tuberosum L. · Potato

PRUMMEL (NL)

FR LV NL SE
6 records

Kartel

Terminated

Solanum tuberosum L. · Potato

Kweekinstituut KARNA (NL)

DE FR NL PL
5 records

Favorita

Protection expired

Solanum tuberosum L. · Potato

MEVR. A.G. EDZES-TILMA /J. ELZINGA

BE FR IT NL
6 records

Ackersegen

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm Ing. Gebrüder Böhm K.G.

AT DE FR SK
5 records

Eldorado

Active

Solanum tuberosum L. · Potato

Van Rijn France

FR HR NL
8 records

Defender

Active

Solanum tuberosum L. · Potato

University of Idaho

BE NL
6 records

Wotan

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

AT DK FR
7 records

Wilja

Active

Solanum tuberosum L. · Potato

SOLTAU| Raiffeisen Centralheide eG

DE IE NL
7 records

St. Julien A

Active

Prunus domestica L. · European plum

CZ NL SK
8 records

Stine 07P32

Active

Glycine max (L.) Merr. · Soybean

STINE SEED CO.

PL RO UA
6 records

Vindika

Active

Solanum tuberosum L. · Potato

VERENIGDE KWEEKBEDRIJVEN (NL)

DE FR IE
10 records

Titan

Active

Solanum lycopersicum L. · Tomato

Dutch American Plantbreeders Corp.

CZ PL SK
6 records

Rubis

Active

Solanum tuberosum L. · Potato

Federation des Syndicats Bretons (FR)

ES FR PT
7 records

Seresta

Active

Solanum tuberosum L. · Potato

SLOOTS| R.H. Sloots

DE FI NL
7 records

Safrane

Active

Solanum tuberosum L. · Potato

Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

BG ES FR
8 records

Pr55v48

Active

Medicago sativa L. · Alfalfa

Tomasich Josef

BG RO UA
8 records

Magda

Active

Solanum tuberosum L. · Potato

SAATZUCHT FRITZ LANGE KG, DE

CZ LV SK
7 records

Kuba

Active

Solanum tuberosum L. · Potato

Instytut Hodowli i Aklimatyzacji Roslin Panstwowy Instytut Badawczy

DE PL UA
10 records

Evita

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

AT CZ EE
11 records

Ilona

Protection expired

Solanum tuberosum L. · Potato

ZIMMERMANN (DE)/INCONNU (FR)

DE FR NL
6 records

Fabiola

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

AT HR NL
6 records

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