Diseases

Scab

Scab is a group of crop diseases caused by fungi, actinomycetes, or plasmodiophoromycetes, manifesting as spots, ulcers, and deformations on vegetative and generative plant organs.

Mentioned in descriptions 12 064 varieties reference book.

Apple and pear scab affects leaves, flowers, ovaries, and fruits, manifesting as olive-colored spots with a velvety coating, which leads to fruit cracking and yield loss. In potatoes, several types of scab are distinguished: common scab, where ulcers appear on tubers, and powdery scab, characterized by the formation of warts that rupture into powdery ulcers, as well as root damage.

The development of the disease depends on environmental conditions: for fruit scab, high humidity and rainfall are favorable, while for potatoes, it depends on soil specifics (pH, temperature, and moisture). Varietal resistance is ensured by breeding based on major genes or their combinations. Absolutely immune varieties do not exist, so resistance often manifests as field resistance and depends on the climatic zone.

In variety trials, resistance is assessed visually using a scoring scale or in percentages under natural and artificial infection backgrounds. To increase the accuracy of breeding, molecular genetic marking is used, which allows for the detection of resistance genes by genotype, minimizing phenotypic evaluation errors.

Sources10

Breakdown by crop

Apple Scab 1 949 Potato Scab 1 000 Pear Scab 489 Apple Scab 238 Cucumber scab 197 Common Scab of Sugar Beet 34 Plum Scab 10 Peach Scab 9 Olive Leaf Spot 9 Pear Scab 8 Common Scab — Table Beet 8 Apricot Scab 7 Pear scab — Asian pear 7 Citrus Scab 5 Pear Scab — Asian Pear 5 Citrus Scab 3 Pecan Scab 3

Found in these crops

Apple 1 942 Potato 980 European pear 489 Cucumber 266 Apple 236 Sugar beet 33 European plum 10 Peach 9 Garden beet 8 Pear 8 Apricot 7 Japanese pear 7

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.

Schöne Helene

Terminated

Pyrus L. · Pear

Dr. Helmut Jacob

1 record

Schedryk F1

Terminated

Cucumis sativus L. · Cucumber

Shevkunov Valerii Mykolaiovych, Prutens`ka Nataliia Oleksiivna, Shamshyna Anna Viacheslavovna, Portiankin Alieksiei IEvhenovych, Havrysh Serhii Fedorovych,

1 record

SAPHIR

Terminated

Solanum tuberosum L. · Potato

KRAFFT (DE)

1 record

Scarlet Staymared

Protection expired

Malus domestica (Suckow) Borkh. · Apple

DICKEY J.M. (US)

1 record

Santarka

Terminated

Solanum tuberosum L. · Potato

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

2 records

SAPNIS

Terminated

Malus domestica (Suckow) Borkh. · Apple

Rudolfs Dumbravs

1 record

Sander F1

Active

Cucumis sativus L. · Cucumber

Andzhei Rostvorovskyi

2 records

SALITRE

Application submitted

Cucumis sativus L. · Cucumber

IBEROSEEDS COMPAÑIA IBERICA DE SEMILLAS, S.L.

1 record

Saint Edmund's Russet

Active

Malus domestica (Suckow) Borkh. · Apple

Information not available - Contact NL authorities

1 record

Royal Red Delicious

Protection expired

Malus domestica (Suckow) Borkh. · Apple

INCONNU (FR)

1 record

rosica

Terminated

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GBR

1 record

RØD AROMA

Terminated

Malus Mill. · Apple

SVERIGES LANTBRUKSUNIVERSITÄTET

1 record

RumianaSavanna

Terminated

Solanum tuberosum L. · Potato

Kupreichuk Viktor Petrovych, Dan`ko Heorhii Vasyl`ovych, Kolontai Hryhorii Mykolaiovych, Khomenko Larysa Dmytrivna, Petrenko Kateryna Oleksandrivna, Onyshcenko Oleh Fedorovych,

2 records

Rodničiok

Terminated

Cucumis sativus L. · Cucumber

FGUP ,,Volgogradsortsemovošč"

1 record

Rooja

Withdrawn

Malus domestica (Suckow) Borkh. · Apple

ROJA spółka z o.o. w upadłości likwidacyjnej

2 records

Rosmerta

Active

Malus domestica (Suckow) Borkh. · Apple

Toth Magdolna / Bodor Peter

2 records

Rosalia

Terminated

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GBR

1 record

Röd Gråsten

Active

Malus domestica (Suckow) Borkh. · Apple

Information not available - Contact NL authorities

1 record

Rugold

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

2 records

Romy

Active

Solanum tuberosum L. · Potato

Kweek- en Researchbedrijf Agrico B.V.

2 records

Red Szampion

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

2 records

Red Pigeon

Active

Malus domestica (Suckow) Borkh. · Apple

Information not available - Contact NL authorities

1 record

REGINE

Terminated

Malus Mill. · Apple

Fischer, C. / Murawski, H.

1 record

Redrok

Application submitted

Malus domestica (Suckow) Borkh. · Apple

Gospodarstwo Szkółkarskie Andrzej i Szymon Nowakowscy

2 records

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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
Grey mold 7 316

All terms →

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.