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.
Pyrus communis L. · European pear
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Pyrus communis L. · European pear
Pepinieres et Roseraies Georges Delbard| FR
Cucumis sativus L. · Cucumber
Domaine Public (FR)
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Cucumis sativus L. · Cucumber
Nunhems Netherlands B.V.
Cucumis sativus L. · Cucumber
Enza Zaden Beheer B.V.
Malus domestica (Suckow) Borkh. · Apple
Domaine Public (FR)
Malus domestica (Suckow) Borkh. · Apple
VÝZKUMNÝ A ŠLECHTITELSKÝ ÚSTAV OVOCNÁŘSKÝ HOLOVOUSY s.r.o. (CZ)
Solanum tuberosum L. · Potato
BACIU ANCA-MIHAELAMIKE LUIZA
Malus domestica (Suckow) Borkh. · Apple
Société Nouvelle Pépinières et Roseraies Georges Delbard S.A.S.
Malus domestica (Suckow) Borkh. · Apple
Pepinieres et Roseraies Georges Delbard| FR
Pyrus communis L. · European pear
Cucumis sativus L. · Cucumber
Enza Zaden Beheer B.V.
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Solanum tuberosum L. · Potato
Saka Pflanzenzucht GmbH Co KG
Malus domestica (Suckow) Borkh. · Apple
SERIDA
Cucumis sativus L. · Cucumber
Enza Zaden Beheer B.V.
Malus domestica (Suckow) Borkh. · Apple
Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE) , Dalival S.A.S.
Malus domestica (Suckow) Borkh. · Apple
SNC Elaris (FR)/Institut National de la Recherche Agronomique (FR)
Malus domestica (Suckow) Borkh. · Apple
IFO SARL (FR)
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Solanum tuberosum L. · Potato
Heinrich Böhm^^^SCHUCHMANN R.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.