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.

Čačanska rana

Active

Prunus domestica L. · European plum

CZ HU NL PL SI SK

15 records

Regina

Active

Cucumis sativus L. · Cucumber

SEMO a.s

BG CZ FR NL SK

8 records

Finka

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm GmbH & Co. KG (DE)

BG CZ DE SK UA

13 records

Concurrent

Protection expired

Solanum tuberosum L. · Potato

Kweekbedrijf-Zpc (NL)

BE ES FR IT NL

11 records

Fiesta

Active

Malus domestica (Suckow) Borkh. · Apple

THE KENT INCORPORATED SOCIETY

BE DE FR NL PL

14 records

Telamon

Active

Malus Mill. · Apple

Tobutt, Kenneth R.|Maidstone, England

DK IT NL SE

8 records

Simply Red

Active

Solanum tuberosum L. · Potato

Van Rijn B.V.

HR NL PL UA

12 records

Ranger Russet

Active

Solanum tuberosum L. · Potato

Wilhelm Meyer in Fa. Golden Geest Kartoffel Erzeuger- gesellschaft mbH

DE ES IT NL

9 records

Pentland Dell

Active

Solanum tuberosum L. · Potato

SASA

ES IE IT NL

9 records

Red pontiac

Active

Solanum tuberosum L. · Potato

WESTON JW (US)

ES FR LU NL

9 records

Navan

Active

Solanum tuberosum L. · Potato

PBI Cambridge (GB)

CZ HU IE SI

12 records

Lobo

Active

Malus domestica (Suckow) Borkh. · Apple

RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE DOCHERNEE UNITARNOE PREDPRITIE «INSTITUT PLODOVODSTVA»

LT NL PL SI

14 records

Soprano

Active

Solanum tuberosum L. · Potato

Sloots Aardappelkweekbedrijf B.V.

13 records

Piccolo star

Active

Solanum tuberosum L. · Potato

VAN RIJN-KWS B.V.

NL UA

13 records

Toscana

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE HR UA

12 records

Sensation

Active

Solanum tuberosum L. · Potato

Temmerman Handels

IT NL UA

15 records

Emanuelle

Active

Solanum tuberosum L. · Potato

R.P.GRAVELAND

FR LU NL

11 records

Beo

Active

Solanum tuberosum L. · Potato

Walter Wolfgang

DE LU UA

11 records

Setanta

Active

Solanum tuberosum L. · Potato

Teagasc Crops Research Centre

IE UA

12 records

Orla

Active

Solanum tuberosum L. · Potato

TEAGASC OAK PARK RESEARCH CENTRE,CARLOW, CO-CARLOW

IE UA

12 records

Panther

Active

Solanum tuberosum L. · Potato

R.P.GRAVELAND

FR NL

12 records

Lady Amarilla

Active

Solanum tuberosum L. · Potato

GUUS HESELMANS

NL UA

13 records

Kestrel

Active

Solanum tuberosum L. · Potato

Jack Dunnett

IE NL

10 records

Harmony

Active

Solanum tuberosum L. · Potato

Dr Jack Dunnett, Caithness Potato Breeders Ltd

MT NL

12 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.