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
Henning Friehe
Malus domestica (Suckow) Borkh. · Apple
SNC Elaris (FR)/Institut National de la Recherche Agronomique (FR)
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
P H SMEENGE
Solanum tuberosum L. · Potato
Z.BLONSKI
Cucumis sativus L. · Cucumber
ENZA ZADEN B.V.
Beta vulgaris Sugar Beet Group · Sugar beet
Henning Friehe
Solanum tuberosum L. · Potato
BRETAGNE PLANTS INNOVATION S.A.S.
Malus Mill. · Apple
Jan Blazek c/o VSUO Holovousy
Malus domestica (Suckow) Borkh. · Apple
Station de Recherche de Wadenswil (CH)
Pyrus communis L. · European pear
SEMPRA PRAHA A S
Malus domestica (Suckow) Borkh. · Apple
Ústav experimentální botaniky AV ČR, v.v.i. (CZ)
Cucumis sativus L. · Cucumber
SUNSEEDS
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Hanna Schmidt / Dr. Jutta Krüger in Bundesforschungsanstalt für gartenbauliche Pflanzenzüchtung
Solanum tuberosum L. · Potato
VOGEL JOSEF| Dr. Josef Vogel
Malus domestica (Suckow) Borkh. · Apple
SEMPRA PRAHA A S
Cucumis sativus L. · Cucumber
Enza Zaden Beheer B.V.
Solanum tuberosum L. · Potato
Yosef Fohel`
Malus domestica (Suckow) Borkh. · Apple
Stargrow Cultivar Development (ZA)
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum tuberosum L. · Potato
Averis Seeds B.V.
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.