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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.

Folva

Active

Solanum tuberosum L. · Potato

Lars Bach

AT BG CZ DE DK EE +8
25 records

Marabel

Active

Solanum tuberosum L. · Potato

VEREDELINGSBEDRIJF BV

BE BG CZ DE DK ES +7
25 records

Mozart

Active

Solanum tuberosum L. · Potato

RIAN STEKELENBURG / MARTIN F. W. JANSEN KLOMP / W. SANDERS / B. BORKHUIS

CZ HR IT NL PL SK +1
26 records

Markies

Active

Solanum tuberosum L. · Potato

Veredelingsbedrijf B.V.

BG CZ NL PL SI SK
29 records

Chérie

Active

Solanum tuberosum L. · Potato

GERMIMCOPA BREEDING (GERMICOPA SAS)

DE FR HU PL SK UA
28 records

Sifra

Active

Solanum tuberosum L. · Potato

Rocus Pieter Graveland, Cornelus Johannus Biemond.

HR IT MT NL UA
25 records

Nicoter

Active

Malus domestica (Suckow) Borkh. · Apple

Yokhan Nikolai

NL UA
25 records

Challenger

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

NL UA
29 records

Inored

Active

Malus domestica (Suckow) Borkh. · Apple

Telisa Grille

FR
25 records

Ukama

Active

Solanum tuberosum L. · Potato

Trip, J.

AT BE CZ DE DK ES +9
23 records

Saturna

Active

Solanum tuberosum L. · Potato

STADER| Stader Saatzucht eG

AT CZ DE EE FI FR +7
21 records

Vital

Active

Solanum tuberosum L. · Potato

VOOR DEN DAG ADRIAN

BE CZ DE DK EE ES +7
20 records

Carlita

Active

Solanum tuberosum L. · Potato

JA Crebas (NL)

BE BG DE DK EE FR +6
20 records

Crisps4all

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

FR NL UA
28 records

Arizona

Active

Solanum tuberosum L. · Potato

Sjefke Allefs

MT NL UA
27 records

Picasso

Active

Solanum tuberosum L. · Potato

KWEEEKBEDRYJF ROPTA-ZPC

BG DK EE ES FR IE +5
22 records

Jaerla

Active

Solanum tuberosum L. · Potato

ZPC Portugal

AT DE DK ES FR GR +7
22 records

Cleopatra

Active

Solanum tuberosum L. · Potato

ZPC

BE DE DK ES FR HR +6
19 records

Rosara

Active

Solanum tuberosum L. · Potato

VON KAMEKE KARTZ

CZ DE ES HR HU LT +5
24 records

Red Scarlett

Active

Solanum tuberosum L. · Potato

Y.P. van der Werff/ZPC

CZ EE HR HU IT LT +4
20 records

Lady christl

Active

Solanum tuberosum L. · Potato

MUIJSERS| J. Muijsers c/o C. Meijer B.V.

CZ DE FI FR NL PL +2
24 records

Sagitta

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

CZ IT NL PL UA
27 records

Sylvana

Active

Solanum tuberosum L. · Potato

W R L SCHOLTENS

HR IT NL UA
26 records

Flamenco

Active

Solanum tuberosum L. · Potato

ZPC

ES FR NL UA
27 records

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