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
Boldyzheva Liubov Dmytrivna, Kopan` Kira Mykolaivna, Kopan Volodymyr Pavlovych,
Solanum tuberosum L. · Potato
UNITE D'ENSEIGEMENT ET DE RECHERCHE DE PHYTOPATHOL
Malus domestica (Suckow) Borkh. · Apple
Boldyzheva Liubov Dmytrivna
Malus domestica (Suckow) Borkh. · Apple
Information not available - Contact NL authorities
Malus domestica (Suckow) Borkh. · Apple
Kopan` Kira Mykolaivna, Kopan Volodymyr Pavlovych (pomer), Boldyzheva Liubov Dmytrivna,
Malus domestica (Suckow) Borkh. · Apple
Information not available - Contact NL authorities
Malus Mill. · Apple
LIGONNIERE GUY
Malus Mill. · Apple
DELBARD GEORGES
Malus domestica (Suckow) Borkh. · Apple
Sempra Praha a.s., CZ
Malus domestica (Suckow) Borkh. · Apple
SNC Elaris| FR
Pyrus pyrifolia (Burm. f.) Nakai · Japanese pear
INCONNU (FR)
Solanum tuberosum L. · Potato
INCONNU (FR)
Malus domestica (Suckow) Borkh. · Apple
HERRIS JOHN (GB)
Malus domestica (Suckow) Borkh. · Apple
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Solanum tuberosum L. · Potato
J.G.KONST
Solanum tuberosum L. · Potato
Zelia Aureliia Heorhiivna, Bondarchuk Anatolii Andriiovych, Kozun` Ihor Ivanovych, Tymko Liudmyla Volodymyrivna, Pysarenko Nataliia Vasylivna, Lysak Olena Andriivna, Andriienko Tetiana Mykhailivna, Tymko Mykola Hryhorovych, Sydorchuk Vasyl Ivanovych,
Solanum tuberosum L. · Potato
AGRIC.CANADA
Prunus domestica L. · European plum
Information not available - Contact NL authorities
Malus domestica (Suckow) Borkh. · Apple
Institut National de la Recherche Agronomique (FR)/Gaec Chauvire Freres (FR)
Malus domestica (Suckow) Borkh. · Apple
Michel Briot (FR)/Pierre CHARRIAU (FR)
Solanum tuberosum L. · Potato
INCONNU (FR)
Diospyros kaki L. f. · Persimmon
Kazas Oleksandr Naumovych, Derev'ianko Nataliia Vasylivna, Dudchenko Volodymyr Viktorovych, Svyrydovskyi Valerii Mykolaiovych, Derev'ianko Nataliia Vasylivna,
Solanum tuberosum L. · Potato
Nordkartoffel Zuchtgesellschaft mbH
Malus domestica (Suckow) Borkh. · Apple
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka