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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.

Vigo

Application submitted

Solanum lycopersicum L. · Tomato

Vreugdenhil Breeding & Seeds B.V.

NL
2 records

Viola Calabrese

Withdrawn

Solanum tuberosum L. · Potato

UNIVERSITA' DEGLI STUDI DI FIRENZE - DIPARTIMENTO DI SCIENZE AGRONOMICHE E GESTIONE DEL TERRITORIO AGROFORESTALE

IT
1 record

Vilnia

Protection expired

Solanum tuberosum L. · Potato

Lietuvos agrarinių ir miškų mokslų centro Vokės filialas

LT
1 record

WL 311

Terminated

Medicago sativa L. · Alfalfa

WATERMAN LOOMIS

ES
1 record

Varrone

Application submitted

Solanum lycopersicum L. var. lycopersicum · Tomato

Universita Politecnica delle Marche

IT
1 record

Venta

Terminated

Solanum tuberosum L. · Potato

Lietuvos agrarinių ir miškų mokslų centro Vokės filialas

LT
1 record

Ultimus

Terminated

Solanum tuberosum L. · Potato

VEENHUIZEN (FR)

FR
1 record

Twilight

Terminated

Gerbera jamesonii Bolus ex Hook. f. · Barberton daisy

Piet Schreurs Holding B.V.

PL
1 record

Vaiva

Terminated

Solanum tuberosum L. · Potato

Lietuvos agrarinių ir miškų mokslų centro Vokės filialas

LT
1 record

Tyras

Terminated

Solanum tuberosum L. · Potato

Andriienko Ivan Ivanovych, Mel`nyk Pavlo Oleksiiovych, Pysarenko Nataliia Vasylivna, Honcharenko Ol`ha Petrivna, Sydorchuk Svitlana Volodymyrivna, Popereshniuk Valentyna Mykolaivna, Dems`ka Anastasiia Kyrylivna, Muzyka Lidiia Ivanivna, Sydorchuk Vasyl Iva

UA
1 record

Tommy Toe

Terminated

Solanum lycopersicum L. · Tomato

Domaine Public (FR)

FR
1 record

Ultra Butternut

Terminated

Cucurbita moschata Duchesne · Butternut squash

Domaine Public (FR)

FR
1 record

Tiasmins`kyi

Terminated

Solanum lycopersicum L. · Tomato

Lysak Serhii Anatoliiovych, Lysak Zoia Volodymyrivna,

UA
2 records

Topaz

Terminated

Medicago sativa L. subsp. sativa · Alfalfa

AGRIPRO SEEDS

IT
1 record

THYNIA

Terminated

Solanum tuberosum L. · Potato

J.A. Crebas (NL)

FR
1 record

TANJA

Withdrawn

Solanum tuberosum L. · Potato

Geertsema Zaden BV (NL)

FR
1 record

SYNHAIVKA

Active

Solanum tuberosum L. · Potato

Hunchak Volodymyr Mykhailovych, Kozun` Ihor Ivanovych, Tymko Liudmyla Volodymyrivna, Abdurahimova Tamara Volodymyrivna, Andriienko Tetiana Mykhailivna, Pysarenko Nataliia Vasylivna, Lysak Olena Andriivna, Tymko Mykola Hryhorovych, Sydorchuk Vasyl` Ivanovy

UA
2 records

Svitoch

Terminated

Solanum tuberosum L. · Potato

Zelia Avreliia Heorhiivna, Voitseshyna Nataliia Ivanivna, Taktaiev Borys Anatoliiovych, Osypchuk Alla Andriivna, Bondarchuk Anatolii Andriiovych, Nazar Stefaniia Hryhorivna, Osypchuk Andrii Antonovych,

UA
2 records

SW3407

Application submitted

Medicago sativa L. subsp. sativa · Alfalfa

S&W SEED COMPANY

IT
1 record

SVX23T00S47

Active

Glycine max (L.) Merr. · Soybean

Mark MacDuff

UA
2 records

Sviatkova

Terminated

Solanum tuberosum L. · Potato

Razkevych Mykola Pylypovych, Kostiuk Ivan Ivanovych, Buhaiova Izabella Pavlivna, Zelia Aureliia Heorhiivna, Taraschenko Nadiia Ivanivna, Ostrenko Mykhailo Volodymyrovych, Taktaiev Borys Anatoliiovych, Osypchuk Alla Andriivna, Nazar Stefaniia Hryhorivna, O

UA
2 records

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