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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 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.

Bonita

Active

Malus domestica (Suckow) Borkh. · Apple

CZ
8 records

Mitchgla

Active

Malus domestica (Suckow) Borkh. · Apple

ES FR HU NL
10 records

Saskia

Protection expired

Solanum tuberosum L. · Potato

FR HR IT SK
5 records

Svatava

Active

Malus domestica (Suckow) Borkh. · Apple

CZ FR NL SK
11 records

Marcona

Active

Prunus dulcis (Mill.) D. A. Webb · Almond

ES FR SI
12 records

Raider

Active

Cucumis sativus L. · Cucumber

HR NL SI
5 records

Early rose

Active

Solanum tuberosum L. · Potato

FR HR SE
6 records

Alkmene

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL SI
11 records

Tramin

Active

Malus domestica (Suckow) Borkh. · Apple

DE UA
9 records

Beurré Bosc

Active

Pyrus communis L. · European pear

FR NL SI
9 records

Rafzubex

Active

Malus domestica (Suckow) Borkh. · Apple

FR NL
10 records

Condo

Active

Pyrus communis L. · European pear

CZ ES NL
13 records

Shalimar

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL
15 records

Melba

Active

Malus domestica (Suckow) Borkh. · Apple

EE LT
10 records

Mantet

Active

Malus domestica (Suckow) Borkh. · Apple

CZ SI
8 records

Redspring

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL
10 records

Harrow Sweet

Active

Pyrus communis L. · European pear

FR NL
12 records

Admiral

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL
14 records

B3F45

Active

Malus domestica (Suckow) Borkh. · Apple

NL
8 records

Reanda

Active

Malus domestica (Suckow) Borkh. · Apple

DE HU UA
7 records

BTS 7160

Active

Beta vulgaris Sugar Beet Group · Sugar beet

CZ DE UA
4 records

Coscia

Active

Pyrus communis L. · European pear

FR NL SI
13 records

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