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 Pear 8 Garden beet 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.

Golden Millennium

Terminated

Solanum tuberosum L. · Potato

SCRI / DAFS

3 records

Gala Surf

Active

Malus domestica (Suckow) Borkh. · Apple

GFA BRISSET

4 records

Excalibur

Active

Solanum tuberosum L. · Potato

CYGNET POTATO BREEDERS

4 records

Eden

Active

Malus domestica (Suckow) Borkh. · Apple

Agriculture & Agri-Food Canada, Saint-Jean-sur-Richelieu

4 records

Belorusskij Sinap

Active

Malus domestica (Suckow) Borkh. · Apple

RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE DOCHERNEE UNITARNOE PREDPRITIE «INSTITUT PLODOVODSTVA»

4 records

Rudeninis dryžuotasis

Active

Malus domestica (Suckow) Borkh. · Apple

Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas

EE LT

2 records

SINAEDA

Terminated

Solanum tuberosum L. · Potato

Kweekbedrijf-Zpc (NL)

ES FR

2 records

Selena

Active

Malus Mill. · Apple

BLAZEK J.

IT SK

3 records

Rubin

Application submitted

Malus Mill. · Apple

SEMPRA CARLO

IT SK

3 records

Rea Agata

Active

Malus domestica (Suckow) Borkh. · Apple

Prof. Dr. Christa Fischer / Dr. Andreas Peil im Inst. f. ZF an gartenb. Kulturen und Obst -Julius-Kühn-Institut-

DE UA

5 records

Nabella

Active

Malus Mill. · Apple

BLAZEK J.

IT SK

2 records

National

Active

Cucumis sativus L. · Cucumber

Domaine Public (FR)

FR SI

2 records

Mutsu NK

Active

Malus domestica (Suckow) Borkh. · Apple

Information not available - Contact NL authorities

NL PL

2 records

Felicita

Active

Malus domestica (Suckow) Borkh. · Apple

APP Darzkopibas instituts

CZ LV

3 records

Fendeca

Active

Malus Mill. · Apple

Reinhard Kaneppele - Termeno (IT)

BG IT

2 records

Gemini 7 hybrid

Protection expired

Cucumis sativus L. · Cucumber

Harris Moran Seed (US)

IT SI

2 records

Frontier Russet

Terminated

Solanum tuberosum L. · Potato

MEYER WILHELM| Wilhelm Meyer in Fa. Golden Geest Kartoffel Erzeuger-gesellschaft mbH

DE NL

2 records

Baujade

Terminated

Malus Mill. · Apple

CADIC| Alain Cadic

DE IT

2 records

BTS 7635

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Margaret Rekoske

DE UA

2 records

César

Terminated

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)

FR NL

2 records

Carmen

Terminated

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm GmbH & Co. KG

ES NL

2 records

BTS Smart 3525

Active

Beta vulgaris Sugar Beet Group · Sugar beet

Henning Friehe

DE UA

2 records

VB Aista

Active

Solanum tuberosum L. · Potato

Lietuvos agrarinių ir miškų mokslų centras

2 records

Wiarus

Terminated

Cucumis sativus L. · Cucumber

SPÓJNIA Hodowla i Nasiennictwo Ogrodnicze sp. z o.o.

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.