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.

Piros

Active

Malus domestica (Suckow) Borkh. · Apple

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

BE DE FR HU NL PL +1

17 records

Pamina

Active

Solanum tuberosum L. · Potato

UNICOPA/CLAUSE

BE DE DK ES FR IE +1

10 records

Frieslander

Protection expired

Solanum tuberosum L. · Potato

Selectiebedrijf KOOI (NL)

AT BE DE DK FR NL +1

11 records

Verdi

Active

Pyrus communis L. · European pear

VERHAEGH JACOBUS JOHANNES

BE FR HU IT NL PL

17 records

Elvira

Active

Solanum tuberosum L. · Potato

Soltau-Bergen eG

BE ES FR IE IT NL

12 records

Charlotte

Active

Solanum tuberosum L. · Potato

UNICOPA (FR)/Clause Semences SA (FR)

BE DE DK FR LU NL

12 records

Charlotte

Active

Malus domestica (Suckow) Borkh. · Apple

TOBUTT| K.R. Tobutt c/o Horticultural Research International

BE DE FR IE NL PL

16 records

Solist

Active

Solanum tuberosum L. · Potato

YaShINA IZOL'DA MAKSIMOVNA / RUSAKOVA IRINA GENNAD'EVNA / KALYaGIN YuRIJ NIKOLAEVICh / KABUNIN ALEKSANDR ANATOL'EVICh / KONDAKOVA NATAL'Ya NIKOLAEVNA / ALEKSANDROVA LYuBOV' ALEKSANDROVNA

CZ DE FR LT LV

13 records

Kalunga

Active

Cucumis sativus L. · Cucumber

Enza Zaden, NL

BG CZ NL PL SK

9 records

Granada

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DE IT NL UA

16 records

Colonel

Active

Raphanus sativus L. var. oleiformis Pers. · Oil radish

PHP PETERSEN

CZ DE NL PL UA

13 records

Conference

Active

Pyrus communis L. · European pear

RUP «GRODNENSKIJ ZONALNYJ INSTITUT RASTENIEVODSTVA NAN BELARUSI»

FR HU NL RO SI

21 records

Belana

Active

Solanum tuberosum L. · Potato

Hergen Berding

CZ DE LU SK UA

13 records

Bettina

Active

Solanum tuberosum L. · Potato

Nordostbayer. Saatbauverband GmbH

AT CZ DE HR SI

10 records

Amour

Active

Cucumis sativus L. · Cucumber

Bejo Zaden, NL

BG CZ NL PL SK

12 records

Rubinia

Active

Solanum tuberosum L. · Potato

Potato Seed Solutions

AT ES FR NL

17 records

Marine

Active

Solanum tuberosum L. · Potato

UNICOPA (FR)/Clause Semences SA (FR)

BG FR HR IT

11 records

Borwina

Active

Solanum tuberosum L. · Potato

Wolfgang Walter

DE HR LT LU

10 records

Natascha

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE HR UA

14 records

Faluka

Active

Solanum tuberosum L. · Potato

Private (NL)

HR NL UA

13 records

Anuschka

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm Inh. Gebrüder Böhm K.G.

AT LU UA

11 records

Xeleven

Active

Malus domestica (Suckow) Borkh. · Apple

Red Moon, I

FR UA

14 records

Ronaldo

Active

Solanum tuberosum L. · Potato

Ytzen Pieter van der Werff

NL UA

14 records

Queen Anne

Active

Solanum tuberosum L. · Potato

Solana, D

DE UA

14 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.