Diseases
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.
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.
Solanum tuberosum L. · Potato
Germicopa SAS, FR
Solanum tuberosum L. · Potato
Maurice Schehr c/o HZPC Holland B.V.
Solanum tuberosum L. · Potato
GERMICOPA SAS
Solanum tuberosum L. · Potato
MOELLER| Dr. Karl Heinz Moeller im Institut f.Kartoffelforschung- Abt. Kartoffelzuechtung - / PAPENHAGEN| Dr. Friedrich Papenhagen / TAENDLER| Dr. Karl Taendler
Solanum tuberosum L. · Potato
NIEDEROSTERREICHISCHE SAATBAUGENOSSENSCHAFT, AT
Solanum tuberosum L. · Potato
Rocus Pieter Graveland, Herre Kingma, Erven Kingma, Henderika Kingma-Krottje, Jarig Herre Kingma,
Solanum tuberosum L. · Potato
SOLANA GMBH & CO KG
Solanum tuberosum L. · Potato
Jacob Eising
Solanum tuberosum L. · Potato
Jan Boer
Solanum tuberosum L. · Potato
PLANT BREEDING INTERNATIONAL CAMBRIDGE
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico BV
Solanum tuberosum L. · Potato
GUUS HESELMANS
Malus domestica (Suckow) Borkh. · Apple
Julien Max|Saint Paul d'Espis, FR
Malus domestica (Suckow) Borkh. · Apple
Better3fruit NV, Belgium
Malus domestica (Suckow) Borkh. · Apple
Yves Lespinasse, INRA Institut National de la Recherche Agronomique
Malus domestica (Suckow) Borkh. · Apple
Stichting Wageningen Research-Wageningen Plant Research, Netherlands
Prunus armeniaca L. · Apricot
SUN WORLD INTERNATIONAL
Malus domestica (Suckow) Borkh. · Apple
White Allan
Pyrus communis L. · European pear
Stein Harald Hjeltnes Graminor AS
Solanum tuberosum L. · Potato
Stacja Hodowli Roślin Stawiski
Malus domestica (Suckow) Borkh. · Apple
Ústav experimentální botaniky AV ČR, v.v.i. (CZ)
Solanum tuberosum L. · Potato
LENNART ERJEFÄLT^^^BÖÖS ULLA
Pisum sativum L. · Pea
Selgen a.s., CZ
Solanum tuberosum L. · Potato
WOLF & WOLF B.V.