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
Station de Recherche du Comite Nord (FR)
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Solanum tuberosum L. · Potato
Fobek B.V., Tuberosum Technologies Inc.
Prunus persica (L.) Batsch · Peach
Maillard Arsene / Maillard Laurence
Malus domestica (Suckow) Borkh. · Apple
Gospodarstwo Szkółkarskie Andrzej i Szymon Nowakowscy
Malus domestica (Suckow) Borkh. · Apple
PEPINIERES DU VALOIS SARL, FR
Prunus persica (L.) Batsch · Peach
Laurence Maillard, Arsene Maillard
Malus domestica (Suckow) Borkh. · Apple
Regents of the University of Minnesota / Regents of the University of Minnesota / Regents of the University of Minnesota
Prunus armeniaca L. · Apricot
Hilmar Schwärzel
Cucumis sativus L. · Cucumber
Harris Moran Seed Company, US
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
SCOTTISH CROP RESEARCH INSTITUTE
Solanum tuberosum L. · Potato
Danespo A/S
Solanum tuberosum L. · Potato
PLANTERA SEED BV
Solanum tuberosum L. · Potato
Bavaria Saat GbR
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
Europlant Pflanzenzucht GmbH
Solanum tuberosum L. · Potato
JAMES HUTTON LTD
Solanum tuberosum L. · Potato
Piet H.Smeenge
Solanum tuberosum L. · Potato
ZIMMERMANN WILLI| Willi Zimmermann
Cucumis sativus L. · Cucumber
SEMILLAS FITO, S.A.
Solanum tuberosum L. · Potato
NORIKA Nordring- Kartoffelzucht- und Ver
Cucumis sativus L. · Cucumber
HILD SAMEN GMBH