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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.

SH C 1010

Active

Solanum tuberosum L. · Potato

Stet Holland Research

NL
9 records

Sanjava

Active

Solanum tuberosum L. · Potato

DR. LUDWIG SIMON

CZ
8 records

Sababa

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

NL
10 records

Papageno

Active

Solanum tuberosum L. · Potato

SOLANA GMBH & CO KG

DE
12 records

La Flamboyante

Active

Malus domestica (Suckow) Borkh. · Apple

STATION FEDERALE RAC

FR
9 records

Florice

Active

Solanum tuberosum L. · Potato

Station Recherche du Comité Nord (GIE)

FR
9 records

Clearwater Russet

Active

Solanum tuberosum L. · Potato

University of Idaho, Office of Technology Transfer

NL
9 records

Bonnata KWS

Active

Solanum tuberosum L. · Potato

STET HOLLAND

NL
10 records

Andean Sunside

Active

Solanum tuberosum L. · Potato

Kweek- en Researchbedrijf Agrico BV

NL
10 records

Cabaret

Active

Solanum tuberosum L. · Potato

PLANT BREEDING INTERNATIONAL

8 records

Goldstar

Active

Malus domestica (Suckow) Borkh. · Apple

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

CZ HU NL PL SK
15 records

Vanda

Active

Malus domestica (Suckow) Borkh. · Apple

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

CZ DE FR NL SK
13 records

Marketmore 70

Active

Cucumis sativus L. · Cucumber

Sativa coop (IT)

CZ ES IT SI UA
7 records

Linzer delikatess

Active

Solanum tuberosum L. · Potato

Saatbau Linz OÖ. Landes-Saatbaugen.reg.Gen.m.b.H.

AT BE FR LU NL
8 records

Hansa

Active

Solanum tuberosum L. · Potato

VEREINIGTE SAATZUCHTEN (DE)

DE DK FR LU NL
8 records

Astra

Active

Solanum tuberosum L. · Potato

DANESPO A/S

DE DK HR NL SK
10 records

Allstar

Active

Solanum tuberosum L. · Potato

Jan Lucas Spijkman, Johanna Maria Spijkman-Vergeer

EE LV NL PT SE
8 records

Tyria

Active

Cucumis sativus L. · Cucumber

Enza Zaden Beheer B.V.

CZ NL PL SK
6 records

Thunder

Active

Cucumis sativus L. · Cucumber

Seminis Vegetables (NL)

ES NL SI SK
7 records

Stroma

Active

Solanum tuberosum L. · Potato

Dunnet, J.

DK FR IE SE
10 records

Record

Active

Solanum tuberosum L. · Potato

Potato Marketing Board Edinbourgh Maner Place (UK)

FI HR IE SE
6 records

Red Melba

Active

Malus domestica (Suckow) Borkh. · Apple

CZ FR NL SI
10 records

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