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
Station de Recherche du Comité Nord G.I.E.
Solanum tuberosum L. · Potato
FRIESE MIG V.LANDBOU.
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Sjefke Allefs
Solanum tuberosum L. · Potato
Lantmännen Seed B.V.
Solanum tuberosum L. · Potato
Bavaria Saat GbR
Malus domestica (Suckow) Borkh. · Apple
Solanum tuberosum L. · Potato
Germicopa Breeding, F
Solanum tuberosum L. · Potato
Martin Pot, Marco Klaver
Solanum tuberosum L. · Potato
SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4
Solanum tuberosum L. · Potato
Jack Dunnett
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
PLANTERA SEED BV
Solanum tuberosum L. · Potato
Kweek-en Researchbedrijf Agrico B.V., Netherlands
Malus domestica (Suckow) Borkh. · Apple
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement, France
Solanum tuberosum L. · Potato
Germicopa SAS, FR
Malus domestica (Suckow) Borkh. · Apple
Société Nouvelle Pépinières et Roseraies Georges Delbard S.A.S.
Solanum tuberosum L. · Potato
Koning Smit Holding N.V. (AN)
Solanum tuberosum L. · Potato
Teagasc
Solanum tuberosum L. · Potato
T&G GLOBAL LIMITED
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Wolfgang Walter, Norika Nordring - Kartoffelzucht - und Vermehrungs - GmbH Gross Lusewitz
Solanum tuberosum L. · Potato
Heinrich Böhm
Malus domestica (Suckow) Borkh. · Apple
Stichting Wageningen Research - Wageningen Plant Research, 6708 PB Wageningen