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.

SJCA38R6A74

Active

Malus domestica (Suckow) Borkh. · Apple

Shahrokh Khanizadeh

3 records

Zdabytak

Active

Solanum tuberosum L. · Potato

ZUJKOV ANDREJ EVGEN'EVICh / PISKUN GEORGIJ IVANOVICh / ZhUROMSKIJ GENNADIJ KONSTANTINOVICh / KOLYaDKO OL'GA MATVEEVNA / DEMIDKO YaNINA DAVYDOVNA

4 records

Zen

Active

Solanum tuberosum L. · Potato

GROCEP SICA

5 records

Yukon Gold

Active

Solanum tuberosum L. · Potato

UNIVERSITY OF GUELPH

3 records

X9589

Active

Malus domestica (Suckow) Borkh. · Apple

Jean-Luc Carrieres

5 records

Yanka

Active

Solanum tuberosum L. · Potato

RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NACZIONALNOJ AKADEMII NAUK BELARUSI PO KARTOFELEVODSTVU I PLODOOVOSHHEVODSTVU»

5 records

Vysocina

Active

Solanum tuberosum L. · Potato

Vesa Velhartice a.s.

4 records

Vortice

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Verline

Active

Malus domestica (Suckow) Borkh. · Apple

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

5 records

Vedras

Active

Cucumis sativus L. · Cucumber

Yuksel Tohum, TR

3 records

Valle

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Valfi

Active

Solanum tuberosum L. · Potato

Výzkumný ústav bramborářský Havlíčkův Brod, s.r.o. (CZ)

5 records

Val Blue

Active

Solanum tuberosum L. · Potato

VYZKUMNY USTAV BRAMBORAřSKY HAVLIčKůV BROD, S.R.O.

4 records

Vermont

Active

Solanum tuberosum L. · Potato

Kuipers Potato V.O.F.

5 records

Vitalia

Active

Solanum tuberosum L. · Potato

Stet Holland B.V./WUR Depart. Plantwetenschap Leerstoel Plantenveredeling

5 records

Unistars

Active

Cucumis sativus L. · Cucumber

Bayer Holland B.V.

4 records

Uta

Active

Pyrus L. · Pear

FISCHER MANFRED| Prof. Dr. Manfred Fischer / MILDENBERGER| Gisela Mildenberger

3 records

Travatore

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

4 records

Treladine

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

UEB 481

Active

Malus domestica (Suckow) Borkh. · Apple

Institute of Experimental Botany AS CR v.v.i.

4 records

Touareg

Active

Solanum tuberosum L. · Potato

Station de Recherche du Comité Nord G.I.E.

4 records

Topaz

Active

Cucumis sativus L. · Cucumber

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

4 records

Tolstoj

Active

Cucumis sativus L. · Cucumber

MORAVOSEED

3 records

Tinca

Active

Solanum tuberosum L. · Potato

Danespo A/S

4 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

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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.