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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.

Sirius

Active

Malus domestica (Suckow) Borkh. · Apple

Zima Jan, Louda Otto, Tupy Jaroslav,

CZ HU NL UA
20 records

Sound

Active

Solanum tuberosum L. · Potato

Meijer C. BV (NL)

FR NL UA
18 records

Laperla

Active

Solanum tuberosum L. · Potato

Jacob Eising

HR NL UA
18 records

Lanorma

Active

Solanum tuberosum L. · Potato

Tjerk Krijthe

FR NL UA
19 records

Gwenne

Active

Solanum tuberosum L. · Potato

Germicopa SAS, FR

FR MT UA
15 records

Ranomi

Active

Solanum tuberosum L. · Potato

MARIEN WINTERS

NL UA
17 records

Ludmilla

Active

Solanum tuberosum L. · Potato

SAKA PFLANZENZUCHT GMBH AND CO KG

DE UA
22 records

Lady Jane

Active

Solanum tuberosum L. · Potato

GUUS HESELMANS

NL UA
19 records

Fandango

Active

Solanum tuberosum L. · Potato

Teagasc Crops Research Centre

IE MT
16 records

Fuji Fubrax

Active

Malus domestica (Suckow) Borkh. · Apple

Thomas Braun

FR NL
20 records

Canberra

Active

Solanum tuberosum L. · Potato

REITSMA BARTEL / JANSEN KLOMP MARTIN F.W.

HR NL
18 records

Alouette

Active

Solanum tuberosum L. · Potato

Mr. J.J.H.M. Allefs

NL UA
18 records

Acoustic

Active

Solanum tuberosum L. · Potato

HESELMANS GUUS

NL UA
18 records

Thimo

Active

Pyrus communis L. · European pear

WOLFGANG MULLER,BAUM-UND RUSENSCHULE

NL
17 records

Scilate

Active

Malus domestica (Suckow) Borkh. · Apple

White Allan

FR
15 records

Maritiema

Active

Solanum tuberosum L. · Potato

MR.E.A.BOERHAVE

BE CZ DE DK ES FR +4
14 records

Ostara

Active

Solanum tuberosum L. · Potato

OFFEREINS (NL)

AT CZ ES FI FR HR +3
14 records

Golden Delicious

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR HU NL PL +2
27 records

Jonagold

Active

Malus domestica (Suckow) Borkh. · Apple

Station de Geneva (US)

CZ ES FR HU NL PL +2
22 records

Bartina

Active

Solanum tuberosum L. · Potato

P.I.J. VAN DER WERFF & COOP. DE Z.P.C.

DK ES FR HR IE IT +2
14 records

Rafzubin

Active

Malus domestica (Suckow) Borkh. · Apple

Walter Hauenstein-Roschli

BE CZ DE ES FR NL +1
22 records

Granola

Active

Solanum tuberosum L. · Potato

SAKA-RAGIS PFLANZENZUCHT GBR

CZ DE ES HR IE NL +1
16 records

Romano

Active

Solanum tuberosum L. · Potato

Veredelingsbedrijf B.V.

HR HU IE NL SI UA
15 records

Artemis

Active

Solanum tuberosum L. · Potato

M. WINTENS_

BG CZ HR NL SK
15 records

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