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.
Malus domestica (Suckow) Borkh. · Apple
Magdolna Tóth^^^Szilvia Kovács
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Cucumis sativus L. · Cucumber
ROBERT SWINKELS
Malus domestica (Suckow) Borkh. · Apple
Ústav experimentální botaniky AV ČR, v.v.i. (CZ)
Malus domestica (Suckow) Borkh. · Apple
R.D. & P.J. Mitchell
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel
Solanum tuberosum L. · Potato
Teagasc
Cucumis sativus L. · Cucumber
W. LEGUTKO PRZEDSIEBIORSTWO HODOWLANO NASIENNE SP.Z.O.O
Solanum tuberosum L. · Potato
A BERNARD (FR)
Pyrus communis L. · European pear
Sächsische Landesanstalt für Landwirtschaft
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
NEIKER-INSTITUTO VASCO DE INVESTIGACIÓN Y DESARROLLO AGRARIO, S.A.
Solanum tuberosum L. · Potato
Karsten Ellenberg
Malus domestica (Suckow) Borkh. · Apple
Solanum tuberosum L. · Potato
Station de Recherche du Comite Nord (FR)
Malus domestica (Suckow) Borkh. · Apple
Vailima Orchard Ltd (NZ)
Cucumis sativus L. · Cucumber
ESASEM, I
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Pyrus communis L. · European pear
Sumio FUKUI (US)
Solanum tuberosum L. · Potato
DE ZPC
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Malus domestica (Suckow) Borkh. · Apple
Institut Français des Productions Cidricoles (I.F.P.C.), Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)
Cucurbita pepo L. · Field pumpkin
Graines Gautier SA (FR)