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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 Plum 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.

INX 1624

Active

Solanum lycopersicum L. · Tomato

Khaled Kazzaz

UA
1 record

Horodenkivs`ka

Application submitted

Solanum tuberosum L. · Potato

Zelia Avreliia Heorhiivna, Fedoriuk Mariia Dmytrivna, Ravlyk Dmytro Vasyl`ovych,

UA
2 records

Grizzly

Application submitted

Glycine max (L.) Merr. · Soybean

AGENZIA REGIONALE PER LO SVILUPPO RURALE (ERSA)

IT
1 record

GOSOLO

Active

Solanum lycopersicum L. · Tomato

ZETA SEEDS S.L.

ES
1 record

GM 61-1

Terminated

Prunus cerasus L. · Sour cherry

Centre de Recherches Agronomiques de Gembloux (BE)

FR
1 record

GM 9

Terminated

Prunus cerasus L. · Sour cherry

Centre de Recherches Agronomiques de Gembloux (BE)

FR
2 records

GF 677

Protection expired

Prunus persica (L.) Batsch · Peach

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

FR
1 record

Geneva 202

Active

Malus Mill. · Apple

Information not available - Contact NL authorities

NL
1 record

Geneva 16

Active

Malus Mill. · Apple

Information not available - Contact NL authorities

NL
1 record

Genaros F1

Terminated

Solanum lycopersicum L. · Tomato

Maren Shurmans

UA
1 record

GM 79

Terminated

Prunus cerasus L. · Sour cherry

Centre de Recherches Agronomiques de Gembloux (BE)

FR
2 records

Furor

Application submitted

Solanum tuberosum L. · Potato

Haistruk, Hennadii Shkurko, Ihor

UA
2 records

FORNER ALCAIDE V41

Withdrawn

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

VARIOS OBTENTORES

ES
1 record

GISELA 5

Terminated

Hybrids between Prunus fruticosa Pall. and Prunus cerasus L.

GRUPPE WERNER

RO
1 record

FSG408DP

Active

Medicago sativa L. nothosubsp. varia (Martyn) Arcang. · Bastard Medic

Mike Velde

EE
1 record

Fotyniia

Active

Solanum tuberosum L. · Potato

BORIVSKYI ANATOLII, BONDARCHUK ANATOLII, FURDYHA MYKOLA, KUPRIIANOVA TETIANA, TAKTAIEV BORYS, TOMASH ANATOLII, ZAKHARCHUK NATALIIA, SOBRAN IVAN, HUNCHAK VOLODYMYR, CHEREDNYCHENKO LIUBOV

UA
2 records

Flourball

Active

Solanum tuberosum L. · Potato

INCONNU (FR)

FR
1 record

Fantini

Application submitted

Solanum tuberosum L. · Potato

J.M. Kannegieter

NL
2 records

FANTASIA

Withdrawn

Solanum lycopersicum L. · Tomato

Tezier SA (FR)

FR
1 record

Fabiola

Terminated

Pelargonium grandiflorum (Andrews) Willd. · Regal pelargonium

VAVRA| Mirco Vavra

DE
1 record

FR Strong

Terminated

Lagenaria siceraria (Molina) Standl. · Calabash

Seminis Vegetable Seeds

NL
1 record

Feltar

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Uniwersytet Przyrodniczy w Lublinie

PL
2 records

FANTANGO

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

HORTICULTURE RESEARCH I.

ES
2 records

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