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
Vesa Velhartice a.s.
Solanum tuberosum L. · Potato
Europlant Innovation GmbH & Co. KG
Cucumis sativus L. · Cucumber
Matthijs Groot
Malus domestica (Suckow) Borkh. · Apple
STICHTING DLO-CENTRUM VOOR PLANTENVEREDELINGS-EN
Solanum tuberosum L. · Potato
Teagasc
Malus domestica (Suckow) Borkh. · Apple
Prof. Jaroslav Tupy c/o Institute of Experimental Botany
Malus Mill. · Apple
Princen Wilhelmus J. F. A. / Princen Antonius F. M. J.
Malus domestica (Suckow) Borkh. · Apple
The Francois Family Trust (NZ)
Malus Mill. · Apple
MICHIELSEBS LUDOVICUS JACOBUS ELESABETH
Solanum tuberosum L. · Potato
The James Hutton Institute
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Christa Fischer
Solanum tuberosum L. · Potato
Station du Comite Nord (FR)
Pyrus communis L. · European pear
Malus domestica (Suckow) Borkh. · Apple
Ústav experimentální botaniky AV ČR, v.v.i. (CZ)
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Prunus persica (L.) Batsch · Peach
Malus domestica (Suckow) Borkh. · Apple
N.V. Johan Nicolaï
Solanum tuberosum L. · Potato
Johanna Anny Pruim-van Loon^^^Hubrecht Jan van Loon^^^Anthonie Elbert van Loon^^^Elbertus Marius van Loon^^^Jan Pieter van Loon^^^Johanna Wilhelmina Maatje van Loon-Kloet
Solanum tuberosum L. · Potato
Dr. R.J.Mansholt's Veredelingsbedrijf
Malus domestica (Suckow) Borkh. · Apple
Institute of Experimental Botany AS CR, Czech Republic
Solanum tuberosum L. · Potato
C.J.J. Laan, A.S.J. Laan,
Cucumis sativus L. · Cucumber
MORAVOSEED
Solanum tuberosum L. · Potato
Lars Naested
Solanum tuberosum L. · Potato
IPR BV