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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.

Fianna

Active

Solanum tuberosum L. · Potato

EE HR IE LV NL PL +1
20 records

Gala

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR HU NL PL +3
25 records

Galaxy

Active

Malus domestica (Suckow) Borkh. · Apple

BE DE ES FR HU NL
24 records

Idared

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR HU NL PL +2
22 records

Hertha

Active

Solanum tuberosum L. · Potato

DE EE FI HR IE NL +2
12 records

Mutsu

Active

Malus domestica (Suckow) Borkh. · Apple

ES FR HU NL PL RO +1
23 records

Braeburn

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR HU NL SK
19 records

Sirtema

Active

Solanum tuberosum L. · Potato

AT DK FR HR IT LU +1
12 records

Melrose

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR NL PL SI
19 records

Caudle

Active

Malus domestica (Suckow) Borkh. · Apple

CZ FR HU PL
13 records

Luresweet

Active

Malus domestica (Suckow) Borkh. · Apple

FR NL
13 records

Cardinal

Active

Solanum tuberosum L. · Potato

ES FR HR NL
11 records

Reglindis

Active

Malus domestica (Suckow) Borkh. · Apple

DE HU NL PL UA
14 records

Cilena

Active

Solanum tuberosum L. · Potato

DE FR IT LU NL
8 records

Discovery

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL PL SI
14 records

Zonga

Active

Malus domestica (Suckow) Borkh. · Apple

NL
9 records

Rubinstar

Active

Malus domestica (Suckow) Borkh. · Apple

BE DE FR NL PL
12 records

Freedom

Active

Malus domestica (Suckow) Borkh. · Apple

FR HU LT NL PL
13 records

Curé

Active

Pyrus communis L. · European pear

ES FR RO SI
12 records

Beurré Hardy

Active

Pyrus communis L. · European pear

FR NL SI
12 records

Dalinbel

Active

Malus domestica (Suckow) Borkh. · Apple

FR NL
10 records

UEB 6581

Active

Malus domestica (Suckow) Borkh. · Apple

CZ
10 records

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