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
STICHTING WAGENINGEN RESEARCH-WAGENINGEN PLANT RESEARCH
Malus domestica (Suckow) Borkh. · Apple
Wilton Weert B.V. (NL)
Malus domestica (Suckow) Borkh. · Apple
Ústav experimentální botaniky AV ČR, v.v.i. (CZ)
Malus domestica (Suckow) Borkh. · Apple
Sortenschutz Hofmann GmbH (DE)
Solanum tuberosum L. · Potato
Yosef Fohel`
Malus domestica (Suckow) Borkh. · Apple
Smith, T., Smith, M. A.
Malus domestica (Suckow) Borkh. · Apple
Vivaisti, I
Malus domestica (Suckow) Borkh. · Apple
Sundermeyer Gerhard
Malus domestica (Suckow) Borkh. · Apple
Purdue Research Foundation, USA
Solanum tuberosum L. · Potato
PLANT BREEDING INTERNATIONAL CAMBRIDGE
Malus domestica (Suckow) Borkh. · Apple
New Jersey Agri Exp Stat (US)
Malus Mill. · Apple
RUP «BRESTSKAYA OBLASTNAYA SELSKOXOZYAJSTVENNAYA OPYTNAYA STANCZIYA NAN BELARUSI»
Malus domestica (Suckow) Borkh. · Apple
Red Moon, I
Solanum tuberosum L. · Potato
SOLANA GMBH & CO KG
Solanum tuberosum L. · Potato
Jacob Eising
Solanum tuberosum L. · Potato
YaShINA IZOL'DA MAKSIMOVNA / RUSAKOVA IRINA GENNAD'EVNA / KALYaGIN YuRIJ NIKOLAEVICh / KABUNIN ALEKSANDR ANATOL'EVICh / KIRSANOVA E'L'ZA VLADIMIROVNA / LITOVChENKO ALEKSEJ EVGEN'EVICh
Malus domestica (Suckow) Borkh. · Apple
Red Moon, I
Malus domestica (Suckow) Borkh. · Apple
Zeppa Aldo|Brisbane, AU
Solanum tuberosum L. · Potato
The State of Oregon
Solanum tuberosum L. · Potato
University of Idaho, Office of Technology Transfer
Cucumis sativus L. · Cucumber
SEMINIS VEGETABLE| Seminis Vegetable Seeds Deutschland GmbH
Pyrus communis L. · European pear
SHANNON W.F. (US)
Solanum tuberosum L. · Potato
Landbruks- og matdepartementet, N - 0030 Oslo
Malus domestica (Suckow) Borkh. · Apple
Wageningen Plant Research, NL