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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.

JFS-KW207

Active

Malus Mill. · Apple

Warren Keith S.

6 records

E756-36

Active

Malus domestica (Suckow) Borkh. · Apple

Katherine M. Evans

3 records

SUM 405

Active

Zea mays L. · Maize

Mario Lo Pinto

IT UA
5 records

UEB-3366/1

Active

Malus domestica (Suckow) Borkh. · Apple

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

CZ
4 records

POVIN'

Active

Solanum tuberosum L. · Potato

OSIPChUK ALLA ANDREEVNA / OSIPChUK ANDREJ ANTONOVICh / NAZAR STEFANIYa GRIGOR'EVNA / GRITSENKO EKATERINA PETROVNA / GAJDUK PETR PAVLOVICh / DMITROShchUK VALERIYa EVGEN'EVNA / KUChKO ANATOLIJ ANDREEVICh / MITSKO VLADIMIR NIKOLAEVICh / RAZKEVICh NIKOLAJ FIL

UA
3 records

PICOL 1

Active

Malus domestica (Suckow) Borkh. · Apple

Prof. Dr. Christa Fischer / Dr. Andreas Peil im Inst. f. ZF an gartenb. Kulturen und Obst -Julius-Kühn-Institut-

DE
3 records

Reinette Baumann

Active

Malus domestica (Suckow) Borkh. · Apple

VAN MONS (FR)

FR
3 records

RAXINA 8

Active

Malus domestica (Suckow) Borkh. · Apple

INIA/SERIDA

ES
2 records

RAXINA 30

Active

Malus domestica (Suckow) Borkh. · Apple

SERIDA

ES
4 records

LIMON MONTES

Active

Malus domestica (Suckow) Borkh. · Apple

SERIDA

ES
3 records

KW 915

Terminated

Beta vulgaris Sugar Beet Group · Sugar beet

KWS SAAT SE & CO.KGAA

DE
2 records

Gala 0502

Application submitted

Malus Mill. · Apple

COLA GIACOMO

IT
2 records

DE LA RIEGA

Active

Malus domestica (Suckow) Borkh. · Apple

SERIDA

ES
3 records

JFS-KW5

Active

Malus Mill. · Apple

Warren Keith S.

3 records

JFS-KW5

Active

Malus x purpurea x Malus transitoria

Keith S Warren

3 records

Co-op 29

Active

Malus domestica (Suckow) Borkh. · Apple

Purdue Research Foundation (PRF)

3 records

KANDIL' ORLOVSKIJ

Active

Malus domestica (Suckow) Borkh. · Apple

SEDOV EVGENIJ NIKOLAEVICh / SEROVA ZOYa MIHAJLOVNA / ZhDANOV VLADILEN VASIL'EVICh / DOLMATOV EVGENIJ ALEKSEEVICh

3 records

Agria

Active

Solanum tuberosum L. · Potato

AT BE BG CZ DE DK +15
38 records

Remarka

Active

Solanum tuberosum L. · Potato

AT BE BG CZ DE DK +13
38 records

Impala

Active

Solanum tuberosum L. · Potato

AT BE BG CZ DE DK +11
27 records

Ditta

Active

Solanum tuberosum L. · Potato

AT CZ DE DK EE ES +6
28 records

Bintje

Active

Solanum tuberosum L. · Potato

AT DK ES FI FR HR +7
20 records

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