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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.

1202

Active

Solanum lycopersicum L. · Tomato

PLANTENKWEKERIJ VREUGDENHIL B.V.

NL
3 records

ADAFUEL

Active

Prunus amygdalus x Prunus persica

C.S.I.C.-AULA DEI

ES
3 records

Akacja

Active

Solanum tuberosum L. · Potato

Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR

PL
4 records

Wei-Rula

Active

Rubus idaeus L. · Red raspberry

5 records

Whitebolwi

Active

Skimmia japonica Thunb. · Japanese skimmia

Albert L.C. Bolwijn

2 records

Troll

Active

Solanum tuberosum L. · Potato

Landbruks- og matdepartementet, N - 0030 Oslo

2 records

Victory Red

Active

Catharanthus roseus (L.) G. Don · Madagascar periwinkle

Sakata Seed Corporation (SCC)

2 records

Tami

Active

Persea americana Mill. · Avocado

Ya'Akov Avraham Ben / Silberstein Miriam / Irihimovitch Vered

4 records

Sophia

Active

Calluna vulgaris (L.) Hull · Common heather

Edens Creations B.V.

2 records

Sarpo Extra

Terminated

Solanum tuberosum L. · Potato

SARPO KFT

2 records

Siris

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

NICOLA TUFARO

3 records

Sunbeam

Active

Solanum tuberosum L. · Potato

ROBERT JOHN CHERRY

4 records

Sarpo Peak

Terminated

Solanum tuberosum L. · Potato

SARPO KFT

2 records

Sarpo Current

Terminated

Solanum tuberosum L. · Potato

SARPO KFT

2 records

Red Star

Active

Pyracantha coccinea M. Roem. · Firethorn

Van der Sar - Vermaat

2 records

Pixie

Terminated

Solanum tuberosum L. · Potato

Zella J. Doig

3 records

Porotan

Active

Castanea crenata Siebold & Zucc. · Japanese chestnut

Toshio Hirabayashi^^^Kazuo Kotobuki^^^Toshihiro Saito^^^Yutaka Sawamura^^^OSAMU TERAI^^^MORIYUKI SHODA^^^Kazuyuki Abe^^^YOSHIHIKO SATO^^^Norio Takada^^^Akihiko Sato^^^TOYOHIDE NISHIBATA^^^YOSHIKI KASHIMURA^^^Katsuyuki Suzuki^^^TAKESHI KIHARA^^^Makoto Uchi

3 records

Paru

Terminated

Solanum tuberosum L. · Potato

The James Hutton Institute

2 records

Peik

Active

Solanum tuberosum L. · Potato

Landbruks- og matdepartementet, N - 0030 Oslo

2 records

Phoebe

Terminated

Erica x darleyensis Bean · Darley heath

David Edge

2 records

Orange Star

Active

Pyracantha coccinea M. Roem. · Firethorn

Van der Sar V.O.F.

2 records

Milagro

Terminated

Solanum tuberosum L. · Potato

Agri-food and Biosciences Institute (AFBI Belfast)

2 records

MERENSKY 6

Application submitted

Persea americana Mill. · Avocado

Zelda van Rooyen^^^Sylvie Kremer-Kohne

2 records

Malling Supreme

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

NIAB EMR

2 records

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