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
NORIKA Nordring-Kartoffelzucht-und Vermehrungs-GmbH Gross Luesewitz
Malus domestica (Suckow) Borkh. · Apple
STATION FEDERALE RAC
Solanum tuberosum L. · Potato
Justus Böhm
Solanum tuberosum L. · Potato
Wolfgang Walter
Malus domestica (Suckow) Borkh. · Apple
Institute of Experimental Botany AS CR, Czech Republic
Solanum tuberosum L. · Potato
Gisele Lairy-Joly
Solanum tuberosum L. · Potato
Walter DeJong, Cornell University
Solanum tuberosum L. · Potato
Walter DeJong, Cornell University
Solanum tuberosum L. · Potato
STET HOLLAND
Malus domestica (Suckow) Borkh. · Apple
Stichting Wageningen Research - Wageningen Plant Research, 6708 PB Wageningen
Solanum tuberosum L. · Potato
STET HOLLAND
Solanum tuberosum L. · Potato
Teagasc Crops Research Centre
Solanum tuberosum L. · Potato
R.P.GRAVELAND
Malus domestica (Suckow) Borkh. · Apple
Volz Richard
Solanum tuberosum L. · Potato
MARC A. SMITH
Solanum tuberosum L. · Potato
Interseed Potatoes GmbH
Solanum tuberosum L. · Potato
R.P.GRAVELAND
Malus domestica (Suckow) Borkh. · Apple
KVITSCHAL Marcus Vinicius (BR)/CRESTANI HAWERROTH Maraisa (BR)/DENARDI Frederico (BR)
Malus domestica (Suckow) Borkh. · Apple
Markus Kobelt
Solanum tuberosum L. · Potato
Europlant innovation GmbH & Co. KG, 21337 Luneburg
Malus domestica (Suckow) Borkh. · Apple
KVITSCHAL Marcus Vinicius (BR)/CRESTANI HAWERROTH Maraisa (BR)/DENARDI Frederico (BR)
Malus domestica (Suckow) Borkh. · Apple
University of Minnesota (US)
Malus domestica (Suckow) Borkh. · Apple
VAN LEUVEN MYLES
Solanum tuberosum L. · Potato
Solana, D