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.

Santiago

Active

Solanum tuberosum L. · Potato

Teagasc

5 records

Seiber

Active

Cucumis sativus L. · Cucumber

Nunhems B.V.

5 records

Santera

Active

Solanum tuberosum L. · Potato

Plantera Seed B.V.

5 records

Saireline

Active

Malus domestica (Suckow) Borkh. · Apple

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

5 records

Roxanna

Application submitted

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Roadie

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Rissoletto

Active

Solanum tuberosum L. · Potato

Semences Innovation Protection Recherche et Environnement (SIPRE) S.A.R.L. Unipersonnelle

6 records

Rilana

Active

Solanum tuberosum L. · Potato

Europlant Pflanzenzucht GmbH

6 records

Rocha

Active

Pyrus communis L. · European pear

Pedro Antonio Rocha

7 records

Rambo

Active

Solanum tuberosum L. · Potato

Stephan Berger

4 records

Quarto

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

3 records

Rea Juice

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-

6 records

Redsleeves

Active

Malus domestica (Suckow) Borkh. · Apple

THE KENT INCORPORATED SOCIETY

4 records

Purple Rain

Active

Solanum tuberosum L. · Potato

Wageningen UR Plant Breeding

6 records

Puccini

Active

Cucumis sativus L. · Cucumber

RIJK ZWAAN WELVER GmbH, DE

3 records

Redfield

Active

Malus domestica (Suckow) Borkh. · Apple

TGL Field & Son (NZ)

4 records

Primarosa

Active

Solanum tuberosum L. · Potato

Vesa Velhartice a.s.

4 records

Pradera

Active

Cucumis sativus L. · Cucumber

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

5 records

Pomdor

Active

Solanum tuberosum L. · Potato

Bretagne-Plants S.C.I.C.A.

4 records

Picobello

Active

Solanum tuberosum L. · Potato

Thijs Jippes

5 records

Pepe

Active

Cucumis sativus L. · Cucumber

Syngenta Seeds B.V.

5 records

Paradox

Active

Solanum tuberosum L. · Potato

Teagasc Crops Research Department

6 records

Orlik

Active

Malus domestica (Suckow) Borkh. · Apple

TROFIMOVA TAISIYa ANDREEVNA / SEDOV EVGENIJ NIKOLAEVICh

6 records

Orlovim

Active

Malus domestica (Suckow) Borkh. · Apple

SEDOV EVGENIJ NIKOLAEVICh / SEROVA ZOYa MIHAJLOVNA / ZhDANOV VLADILEN VASIL'EVICh

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.