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

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.

Lylia

Withdrawn

Solanum lycopersicum L. · Tomato

Domaine Public (FR)

1 record

M9 T337.1

Active

Malus Mill. · Apple

Matsenko Maksym Oleksandrovych

2 records

Lybid

Active

Solanum tuberosum L. · Potato

Haistruk, Hennadii Shkurko, Ihor

2 records

Lietana

Active

Solanum tuberosum L. · Potato

Mel`nyk Pavlo Oleksiiovych, Bondarchuk Anatolii Andriiovych, Kozun` Ihor Ivanovych, Tymko Liudmyla Volodymyrivna, Pysarenko Nataliia Vasylivna, Lysak Olena Andriivna, Andriienko Tetiana Mykhailivna, Tymko Mykola Hryhorovych, Sydorchuk Vasyl Ivanovych,

4 records

Lyon

Active

Castanea sativa Mill. · Sweet chestnut

Information not available - Contact NL authorities

2 records

Lehenda

Active

Solanum tuberosum L. · Potato

Pylypenko Liliia Aminivna, Il`chuk Roman Vasyl`ovych, Il`chuk Lidiia Andriivna,

2 records

Lime digitée d'Australie

Active

Citrus australasica F. Muell. · Australian finger-lime

INCONNU (FR)

1 record

Lena

Terminated

Solanum tuberosum L. · Potato

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

2 records

L447HD

Active

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

Legacy Seeds, Inc., 16-18 th Ave. South Nampa, Idaho 83651, USA

1 record

Konsuelo F1

Terminated

Solanum lycopersicum L. · Tomato

Dubova Oleksandra Fedorivna, Hnatiuk Hanna Hryhorivna,

2 records

KWS C 909

Active

Solanum tuberosum L. · Potato

Stet Holland B.V.

1 record

Kniahynia

Active

Solanum tuberosum L. · Potato

Siharova Dina Dmytrivna, Panasiuk Oleksandr Vasyl`ovych, Sadivs`kyi Myron Vasyl`ovych, Lischak Ivan Oleksiiovych, Loik Mariia Vasylivna, Zaviriukha Petro Danylovych, Tymoshenko Ivan Ivanovych, Snityns`kyi Volodymyr Vasyl`ovych,

3 records

Krymsk 86

Active

Prunus L. · Plum

Information not available - Contact NL authorities

1 record

Khoriv

Terminated

Solanum lycopersicum L. · Tomato

Kovbasenko Raisa Vasylivna, Kovbasenko Kateryna Opanasivna, Kovbasenko Vasyl` Mykhailovych, Hubar Mykola Ivanovych, Horkutsenko Oleksandr Vasyl`ovych,

2 records

Katia F1

Terminated

Solanum lycopersicum L. · Tomato

Aleksieiev IUrii Borysovych

2 records

Kolibri

Terminated

Rhododendron simsii Planch. · Indica azalea

MUSSIG| Kay Muessig

1 record

Kniazha

Terminated

Solanum tuberosum L. · Potato

Dudar Ivan Frankovych, Lytvyn Ol`ha Fedorivna, Vlokh Volodymyr Hryhorovych,

2 records

Kalcyt

Terminated

Solanum lycopersicum L. · Tomato

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

1 record

Irys BOZ

Terminated

Solanum tuberosum L. · Potato

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

1 record

Idol

Protection expired

Solanum lycopersicum L. · Tomato

KLEINHANNS| Christoph Kleinhanns / DEIKE| Helmut Deike - Saatzuchtstation Eisleben -

2 records

HIGAMA

Terminated

Prunus persica (L.) Batsch · Peach

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

1 record

Heline

Terminated

Solanum lycopersicum L. · Tomato

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

2 records

Isis Candy Cherry

Terminated

Solanum lycopersicum L. · Tomato

Domaine Public (FR)

1 record

Honeoye MAR

Terminated

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

Szkółka Markiewicz Agnieszka Markiewicz-Januszewska

1 record

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Diseases

Powdery mildew 33 570
Fusarium wilt and blight 29 887
Viral mosaic diseases 22 022
Downy mildew 16 384
Leaf spot diseases 15 926
Rust 14 859
Verticillium wilt 12 175
Scab 12 064

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.