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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.

Cykada

Terminated

Solanum tuberosum L. · Potato

Stacja Hodowli Roslin Plochocin

PL
6 records

Cordula

Active

Solanum tuberosum L. · Potato

LANGE WINFRIED| Dr. Winfried Lange

DE
4 records

Crokini

Active

Solanum lycopersicum L. · Tomato

HM.Clause S.A.S.

NL
3 records

Defiant

Terminated

Solanum lycopersicum L. · Tomato

Johnny's Selected Seeds

NL
2 records

Coco

Active

Solanum tuberosum L. · Potato

Saka Pflanzenzucht GmbH Co KG

DE
3 records

Cyprian

Terminated

Solanum tuberosum L. · Potato

Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie

PL
4 records

Coval

Active

Solanum tuberosum L. · Potato

MIKE LUIZANUCSI EVA

RO
3 records

Christian

Active

Solanum tuberosum L. · Potato

CHIRU SORIN CLAUDIU

RO
3 records

Cezarina

Active

Solanum tuberosum L. · Potato

HERMEZIU RADU

RO
3 records

Consuelo

Active

Solanum lycopersicum L. · Tomato

Indus & Burpee Private Ltd

NL
2 records

Chantal

Terminated

Solanum tuberosum L. · Potato

Winfried Lange, Frank Lange, Lange Wolf

DE
3 records

Cassandra

Active

Solanum tuberosum L. · Potato

Germicopa Breeding S.A.S

NL
3 records

COLT

Application submitted

Prunus cerasus L. · Sour cherry

EAST MALLING RESEARCH ST. (GB)

FR
2 records

Cocktail Crush

Active

Solanum lycopersicum L. · Tomato

BURPEE EUROPE LIMITED

NL
2 records

Cleopatra WB

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Masiá Ciscar S.L.

ES
3 records

Camillo

Active

Solanum tuberosum L. · Potato

Johannes M.H. van den Oord

NL
4 records

Callisto

Withdrawn

Solanum tuberosum L. · Potato

HZPC Holland B.V.

NL
2 records

Cilady

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Mr P. Roudeillac (FR)

FR
4 records

Chrobry

Active

Solanum lycopersicum L. · Tomato

PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.

PL
2 records

C 35

Active

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

ES
2 records

Christian

Terminated

Solanum lycopersicum L. · Tomato

WESTERN SEED ESPAÑA, S.A.

ES
2 records

Buffalosun

Active

Solanum lycopersicum L. · Tomato

HM.Clause S.A.S.

FR
3 records

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