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.

Pompadour

Active

Solanum tuberosum L. · Potato

ZPC

DE DK ES FR IE

13 records

Rewena

Active

Malus domestica (Suckow) Borkh. · Apple

Prof. Dr. Manfred Fischer / Heinz Murawski + im Institut für Obstforschung Dresden-Pillnitz / Prof. Dr. Christa Fischer

DE HU NL PL UA

16 records

Rajka

Active

Malus domestica (Suckow) Borkh. · Apple

Ústav experimentální botaniky AV ČR, v.v.i. (CZ)

CZ HU NL PL SK

19 records

Leonarda

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE and CO KGAA

BE DK LT PL UA

7 records

Jersey Mac

Active

Malus domestica (Suckow) Borkh. · Apple

ES FR HU LT SI

13 records

Elise

Active

Malus domestica (Suckow) Borkh. · Apple

VERHAEGH| Jacobus Johannes Verhaegh

BE DE FR NL PL

18 records

Darina

Active

Cucumis sativus L. · Cucumber

Seminis SVS Holland, NL

CZ FR HU SI SK

7 records

Delorgue

Active

Malus domestica (Suckow) Borkh. · Apple

Pepinieres et Roseraies Georges Delbard| FR

BE DE ES FR NL

12 records

Sava

Active

Solanum tuberosum L. · Potato

Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel

DK NL PL SE

10 records

Estima

Active

Solanum tuberosum L. · Potato

SELECTIEBEDRIJF LUIDENBURG BV

FR IE IT NL

11 records

Crowngold

Active

Malus domestica (Suckow) Borkh. · Apple

National Fruit Trials (R. Stapleton)

BE DE FR NL

11 records

Crebella

Active

Solanum tuberosum L. · Potato

J.A. Crebas (NL)

BE ES FR NL

8 records

Anaïs

Active

Solanum tuberosum L. · Potato

GROCEP SICA

BG FR HR MT

11 records

Cara

Active

Solanum tuberosum L. · Potato

Teagasc

ES IE LU MT

11 records

Avanti

Active

Solanum tuberosum L. · Potato

STET Holland B.V.

FR IT NL

11 records

Zorba

Active

Solanum tuberosum L. · Potato

STOVER PRODUKTION GMBH

DE ES IT

9 records

Tebina

Active

Solanum tuberosum L. · Potato

Temmerman Jacques C.M.J.

BE LU SI

7 records

Sunshine

Active

Solanum tuberosum L. · Potato

Solana, D

FR NL UA

10 records

Melanie

Active

Solanum tuberosum L. · Potato

Grocep (FR)

DE FR NL

11 records

Marta

Active

Solanum tuberosum L. · Potato

SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4

CZ DE PL

10 records

Fakse

Active

Solanum tuberosum L. · Potato

Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel

DK EE PL

10 records

Elodie

Active

Solanum tuberosum L. · Potato

JEAN MARC ABHIVEN_

BG FR UA

8 records

Barna

Active

Solanum tuberosum L. · Potato

Teagasc Oak Park Research Centre

ES IE NL

10 records

Agila

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE LT LU

9 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.