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 Japanese pear 7 Apricot 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.

Belami

Active

Solanum tuberosum L. · Potato

Station de Recherche du ComitÚ Nord

7 records

Bohemia

Active

Solanum tuberosum L. · Potato

Vesa Velhartice a.s.

5 records

Atos

Active

Cucumis sativus L. · Cucumber

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

4 records

Annalisa

Active

Solanum tuberosum L. · Potato

SICA GROCEP

8 records

Annaglo

Active

Malus domestica (Suckow) Borkh. · Apple

The Wislang Family Trust (NZ)

6 records

Andromeda KWS

Active

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

4 records

Alizee

Terminated

Solanum tuberosum L. · Potato

Station de Recherche du Comite Nord, F-76110

5 records

Aisha

Active

Solanum tuberosum L. · Potato

IPR B.V.

7 records

Zouk 32

Active

Malus domestica (Suckow) Borkh. · Apple

ZOUK bvba, BE3800 Sint-Truiden

5 records

Safiyah

Active

Solanum tuberosum L. · Potato

Mr Anto Beets, Anto Beets of Maatschap Beets- Siertsema

5 records

Pike

Protection expired

Solanum tuberosum L. · Potato

Plaisted, PL

4 records

Pachafdare

Active

Pelargonium peltatum (L.) L'Hér. · Ivy-leaf geranium

Martin Geibel c/o Elsner pac Jungpflanzen GbR

4 records

Minnewashta

Active

Malus domestica (Suckow) Borkh. · Apple

Luby, James / University of Minnesota

5 records

Mondial Gala

Active

Malus domestica (Suckow) Borkh. · Apple

5 records

Eve Balfour

Terminated

Solanum tuberosum L. · Potato

SCOTTISH CROP RESEARCH INSTITUTE

5 records

Cabp Fuji

Active

Malus domestica (Suckow) Borkh. · Apple

CHRIS LEE BRIAN EDWARDS ALLAN DELUGAR

8 records

Alpine Russet

Active

Solanum tuberosum L. · Potato

University of Idaho

4 records

Stayman Winesap

Active

Malus domestica (Suckow) Borkh. · Apple

STAYMAN (US)

ES FR

4 records

Heisei Fuji

Active

Malus domestica (Suckow) Borkh. · Apple

Yahagi Ryozo

FR NL

8 records

UEB 26002

Active

Malus domestica (Suckow) Borkh. · Apple

Prof. Jaroslav Tupy c/o Institute of Experimental Botany

4 records

Xenia.

Active

Pyrus communis L. · European pear

RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE DOCHERNEE UNITARNOE PREDPRITIE «INSTITUT PLODOVODSTVA»

4 records

Douce de l Avent

Active

Malus domestica (Suckow) Borkh. · Apple

Institut Français des Productions Cidricoles (I.F.P.C.), Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)

5 records

DEL'FIN

Active

Solanum tuberosum L. · Potato

ZUJKOV ANDREJ EVGEN'EVICh / NEZAKONOVA LYuDMILA VASIL'EVNA / IGNATOVA NADEZhDA MAKSIMOVNA / MAHAN'KO LEONID ARKAD'EVICh / SChASLENOK EVA MAKSIMOVNA / BUS'KO IVAN IVANOVICh

6 records

Merbeingold 2336

Active

Citrus L. · Citrus

Sykes Stephen Richard|Mildura, AU

3 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.