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.

Melia

Active

Solanum tuberosum L. · Potato

Dr. Sieber und Forster GbR (ForKa)

3 records

Mammut

Active

Malus domestica (Suckow) Borkh. · Apple

Staatliche Lehr- und Versuchsanstalt für Wein- und Obstbau Weinsberg

4 records

Maïwen

Active

Solanum tuberosum L. · Potato

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

3 records

Mac Intosh

Active

Malus domestica (Suckow) Borkh. · Apple

INTOSH MAC (GB)

2 records

Mazur

Active

Solanum tuberosum L. · Potato

Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie

3 records

Lukasówka

Active

Pyrus communis L. · European pear

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

3 records

Marie Ménard

Active

Malus domestica (Suckow) Borkh. · Apple

Domaine Public (FR)

2 records

Marcel

Active

Cucumis sativus L. · Cucumber

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

2 records

Mammut

Active

Solanum tuberosum L. · Potato

Bavaria Saat GbR

3 records

Longinus

Active

Solanum tuberosum L. · Potato

NIEDEROESTERREICHISCHE SAATBAUGENOSSENSCHAFT

3 records

Lochbuie

Active

Malus domestica (Suckow) Borkh. · Apple

William Turner (NZ)

2 records

Manon

Active

Pyrus communis L. · European pear

VÝZKUMNÝ A ŠLECHTITELSKÝ ÚSTAV OVOCNÁŘSKÝ HOLOVOUSY s.r.o. (CZ)/Prof. Dr. Manfred Fischer (DE)

7 records

Lisbeth

Active

Solanum tuberosum L. · Potato

Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.

3 records

Lipno

Active

Malus domestica (Suckow) Borkh. · Apple

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

8 records

Ligol Redspur

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

4 records

Law Red Rome Beauty

Active

Malus domestica (Suckow) Borkh. · Apple

Gillet (US)

2 records

Lembitu

Active

Malus domestica (Suckow) Borkh. · Apple

Estonian University of Life Sciences Institute of Agricultural and Environmental Sciences Polli Horticultural Research Centre

4 records

Lech

Terminated

Solanum tuberosum L. · Potato

Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR

3 records

Lukas

Terminated

Cucumis sativus L. · Cucumber

SPÓJNIA Hodowla i Nasiennictwo Ogrodnicze sp. z o.o.

2 records

Lawenda

Active

Solanum tuberosum L. · Potato

Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR

5 records

Lawina

Active

Solanum tuberosum L. · Potato

Olsztyńska Hodowla Ziemniaka i Nasiennictwo OLZNAS-CN sp. z o.o.

6 records

Lakeland

Active

Malus domestica (Suckow) Borkh. · Apple

University of Minnesota (US)

2 records

Lafayette

Terminated

Cucumis sativus L. · Cucumber

SUNSEEDS

2 records

Ligol Spur

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

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

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.