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.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Solanum tuberosum L. · Potato
Cyngent Potato Breed. (GB)
Solanum tuberosum L. · Potato
SAATZUCHT FRITZ LANGE KG
Malus domestica (Suckow) Borkh. · Apple
Roduit Aebischer C. (FR)
Malus domestica (Suckow) Borkh. · Apple
SNC Elaris| FR
Solanum tuberosum L. · Potato
Germicopa Breeding S.A.S
Solanum tuberosum L. · Potato
Johannes M.H. van den Oord
Solanum tuberosum L. · Potato
Teagasc
Cucumis sativus L. · Cucumber
Paul Degreef
Solanum tuberosum L. · Potato
Station de Recherche du Comite Nord (FR)/Groupement Interprofessionel de la Pomme de Terre (FR)
Beta vulgaris Garden Beet Group · Garden beet
RIJK ZWAAN WELVER GmbH, DE
Solanum tuberosum L. · Potato
Zsolt Géza Polgár^^^Zsolt Vaszily^^^István Wolf^^^Aliz Bilinszki
Solanum tuberosum L. · Potato
Teagasc
Solanum tuberosum L. · Potato
Heinrich Böhm
Cucumis sativus L. · Cucumber
SEMO a.s
Malus domestica (Suckow) Borkh. · Apple
Tupy Jaroslav
Solanum tuberosum L. · Potato
Teagasc
Solanum tuberosum L. · Potato
Stanley J. Peloquin
Malus domestica (Suckow) Borkh. · Apple
International Plant Management, Inc (US)
Solanum tuberosum L. · Potato
Teagasc Oak Park Research Centre
Solanum tuberosum L. · Potato
Landbrugets Kartoffelfond, Foraedlst., DK-7184 Vandel
Solanum tuberosum L. · Potato
STET HOLLAND RESEARCH B.V.
Solanum tuberosum L. · Potato
IRISH SEED POTATOES LTD
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.