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
Winfried Lange, Frank Lange, Lange Wolf
Cucumis sativus L. · Cucumber
Enza Zaden Beheer B.V.
Cucumis sativus L. · Cucumber
W. LEGUTKO PRZEDSIEBIORSTWO HODOWLANO NASIENNE SP.Z.O.O
Malus domestica (Suckow) Borkh. · Apple
SNC Elaris (FR)/Davodeau Ligonniere Sarl (FR)
Malus domestica (Suckow) Borkh. · Apple
Magdolna Tóth^^^Emese Veres
Malus domestica (Suckow) Borkh. · Apple
SNC Elaris| FR
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Malus domestica (Suckow) Borkh. · Apple
V.O.F. VANDEWALL
Cucumis sativus L. · Cucumber
Francisco Palomares
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum tuberosum L. · Potato
Robert W. Hoopes
Solanum tuberosum L. · Potato
J P G KONST
Malus domestica (Suckow) Borkh. · Apple
CRA-W
Solanum tuberosum L. · Potato
Piet H.Smeenge
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum tuberosum L. · Potato
CALEDONIA POTATO HOLDINGS LTD
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Solanum tuberosum L. · Potato
Germicopa SAS, FR
Malus domestica (Suckow) Borkh. · Apple
EARL des Sources (FR)
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Solanum tuberosum L. · Potato
CALEDONIA POTATO HOLDINGS LTD