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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.

Solist

Active

Solanum tuberosum L. · Potato

YaShINA IZOL'DA MAKSIMOVNA / RUSAKOVA IRINA GENNAD'EVNA / KALYaGIN YuRIJ NIKOLAEVICh / KABUNIN ALEKSANDR ANATOL'EVICh / KONDAKOVA NATAL'Ya NIKOLAEVNA / ALEKSANDROVA LYuBOV' ALEKSANDROVNA

CZ DE FR LT LV
13 records

Rocket

Active

Solanum tuberosum L. · Potato

Thomson, Allan J.

ES FI FR IE SE
12 records

Granada

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DE IT NL UA
16 records

Belana

Active

Solanum tuberosum L. · Potato

Hergen Berding

CZ DE LU SK UA
13 records

Bettina

Active

Solanum tuberosum L. · Potato

Nordostbayer. Saatbauverband GmbH

AT CZ DE HR SI
10 records

Marine

Active

Solanum tuberosum L. · Potato

UNICOPA (FR)/Clause Semences SA (FR)

BG FR HR IT
11 records

Red Anna

Active

Solanum tuberosum L. · Potato

VIKTOR KOPACKA

CZ SK UA
13 records

Natascha

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE HR UA
14 records

Kiebitz

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE HR UA
13 records

Faluka

Active

Solanum tuberosum L. · Potato

Private (NL)

HR NL UA
13 records

Anuschka

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm Inh. Gebrüder Böhm K.G.

AT LU UA
11 records

Ronaldo

Active

Solanum tuberosum L. · Potato

Ytzen Pieter van der Werff

NL UA
14 records

Malou

Active

Solanum tuberosum L. · Potato

Germicopa SAS, FR

FR PT
12 records

Lucinda

Active

Solanum tuberosum L. · Potato

Maurice Schehr c/o HZPC Holland B.V.

NL UA
14 records

Loane

Active

Solanum tuberosum L. · Potato

GERMICOPA SAS

MT PT
11 records

Karelia

Active

Solanum tuberosum L. · Potato

Heinrich Böhm

DE UA
11 records

Laudine

Active

Solanum tuberosum L. · Potato

NIEDEROSTERREICHISCHE SAATBAUGENOSSENSCHAFT, AT

NL UA
12 records

Hermosa

Active

Solanum tuberosum L. · Potato

Rocus Pieter Graveland, Herre Kingma, Erven Kingma, Henderika Kingma-Krottje, Jarig Herre Kingma,

NL UA
12 records

G.935

Active

Malus Mill. · Apple

NL UA
12 records

Edison

Active

Solanum tuberosum L. · Potato

SOLANA GMBH & CO KG

NL UA
12 records

Connect

Active

Solanum tuberosum L. · Potato

Jacob Eising

NL UA
12 records

Divaa

Active

Solanum tuberosum L. · Potato

Jan Boer

MT NL
11 records

Crisper

Active

Solanum tuberosum L. · Potato

Van Rijn France

NL UA
16 records

Bernina

Active

Solanum tuberosum L. · Potato

Saatzucht Hergen Berding

NL UA
14 records

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