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.
Beta vulgaris Sugar Beet Group · Sugar beet
Margaret Rekoske
Solanum tuberosum L. · Potato
Selekta Pacov, a.s., CZ
Malus domestica (Suckow) Borkh. · Apple
Ústav experimentální botaniky AV ČR, v.v.i. (CZ)
Solanum tuberosum L. · Potato
Heinrich Böhm
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Cucumis sativus L. · Cucumber
HAZERA SEEDS B.V.
Solanum tuberosum L. · Potato
Vesa Velhartice a.s.
Solanum tuberosum L. · Potato
Zella J. Doig
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Cucumis sativus L. · Cucumber
ENZA ZADEN
Cucumis sativus L. · Cucumber
PLANTICO ZIELONKI, SP. Z.O.O, PL
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Solanum tuberosum L. · Potato
Lantmõnnen Seed B.V.
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Manfred Fischer / Heinz Murawski + im Institut für Obstforschung Dresden-Pillnitz / Prof. Dr. Christa Fischer
Solanum tuberosum L. · Potato
Piet H.Smeenge
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Christa Fischer
Malus Mill. · Apple
Samus` Volodymyr Andriiovych, Pavliuchyk Anatolii Stepanovych,
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Christa Fischer
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Cucumis sativus L. · Cucumber
SEMO a.s
Malus domestica (Suckow) Borkh. · Apple
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.