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 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.

Romina

Active

Solanum tuberosum L. · Potato

NIEDERSTERREICHISCHE SAATBAUGENOSSENSCHT

AT DK EE ES FR HR +4

18 records

Fresco

Active

Solanum tuberosum L. · Potato

WOLF & WOLF B.V.

BE CZ DE EE FR HR +6

16 records

Oleva

Active

Solanum tuberosum L. · Potato

Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel

DE DK EE ES FI FR +4

19 records

Kennebec

Active

Solanum tuberosum L. · Potato

USDA MAINE

ES FR GR HR IT LU +3

15 records

Satina

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DE HR HU LT PL +2

20 records

Milva

Active

Solanum tuberosum L. · Potato

VANDEL POTATOES I/S

BG CZ DE DK EE HR +2

22 records

Cicero

Active

Solanum tuberosum L. · Potato

Mme R.M. Schouten (NL)/J.A. Crebas (NL)

CZ DE FR GR HU IT +3

21 records

Courage

Active

Solanum tuberosum L. · Potato

VAN DER LEEST B^^^NAUTA J.G.

CZ EE GR HR HU IT +3

16 records

Caesar

Active

Solanum tuberosum L. · Potato

KWEEKBEDRIJF ROPTA ZPC

BG DE DK ES FR IE +2

17 records

Vivaldi

Active

Solanum tuberosum L. · Potato

van der Zee, G. / van der Zee, Pieter

CZ FR HR IT LT NL +1

21 records

Cecile

Active

Solanum tuberosum L. · Potato

IPR B.V.

CZ FR HR HU IT NL +1

17 records

Miranda

Active

Solanum tuberosum L. · Potato

SOLANA DEUTSCHLAND GmbH

CZ DK IT SI UA

20 records

Juliette

Active

Solanum tuberosum L. · Potato

GERMIMCOPA BREEDING (GERMICOPA SAS)

DE FR HU PL SK

21 records

Ariane

Active

Malus domestica (Suckow) Borkh. · Apple

YVES LESPINASSE

FR NL UA

18 records

Scifresh

Active

Malus domestica (Suckow) Borkh. · Apple

White Allan

FR NL

17 records

Trajan

Active

Malus domestica (Suckow) Borkh. · Apple

THE KENT INCORPORATED SOCIETY

BE DE ES FR HU IE +2

18 records

Princess

Active

Solanum tuberosum L. · Potato

Solana Agrarproducte GmbH & Co

CZ DE EE HR LT NL +3

16 records

Marfona

Active

Solanum tuberosum L. · Potato

P.G. KONSTZWAANSHOGK (AGRICO)

ES FR GR HR IE LU +2

18 records

Telamon

Active

Malus domestica (Suckow) Borkh. · Apple

THE KENT INCORPORATED SOCIETY

BE DE ES FR HU IE +2

18 records

Provento

Active

Solanum tuberosum L. · Potato

WOLF&WOLF

BG CZ ES FR HR NL +2

19 records

Kondor

Active

Solanum tuberosum L. · Potato

ROSEFIELD FARM

BG ES HR HU IE LU +2

19 records

Savanna

Active

Solanum tuberosum L. · Potato

Teagasc Oak Park Research Centre

IE IT MT NL UA

18 records

Red Lady

Active

Solanum tuberosum L. · Potato

Solana Agrar Proukte GmBH & Co.

CZ GR HR LT UA

16 records

Atlantic

Active

Solanum tuberosum L. · Potato

Wbbetal USDA Beltsville ARC

DE FR HU PL PT

15 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.