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
SCICA BRETAGNE- PLANTS
Solanum tuberosum L. · Potato
Stet Holland BV (NL)
Solanum tuberosum L. · Potato
RUP «NAUCHNO - PRAKTICHESKIJ CZENTR NACZIONALNOJ AKADEMII NAUK BELARUSI PO KARTOFELEVODSTVU I PLODOOVOSHHEVODSTVU»
Solanum tuberosum L. · Potato
STET HOLLAND
Beta vulgaris Sugar Beet Group · Sugar beet
Dietrich Hauer, Wolfgang Mechelke,
Pyrus communis L. · European pear
Sächsische Landesanstalt für Landwirtschaft
Malus domestica (Suckow) Borkh. · Apple
Piet de SONNAVILLE (NL)
Solanum tuberosum L. · Potato
Vandel Potatoes I/S c/o Danespo A/S
Solanum tuberosum L. · Potato
Teagasc
Solanum tuberosum L. · Potato
Aardappelkweek- en Selectiebedrijf Ijsselmeerpolders B.V.
Solanum tuberosum L. · Potato
Station de Recherche du ComitÚ Nord
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Malus domestica (Suckow) Borkh. · Apple
VAN WELL NURSERY (US)
Malus domestica (Suckow) Borkh. · Apple
Wallace F. Gale y Gertrude Gale
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum tuberosum L. · Potato
Lars Naested
Pyrus communis L. · European pear
VÝZKUMNÝ A ŠLECHTITELSKÝ ÚSTAV OVOCNÁŘSKÝ HOLOVOUSY s.r.o. (CZ)/Prof. Dr. Manfred Fischer (DE)
Solanum tuberosum L. · Potato
Saatzucht Hergen Berding
Malus domestica (Suckow) Borkh. · Apple
Purdue Research Foundation (US)
Malus domestica (Suckow) Borkh. · Apple
Vivai Fratelli Zanzi Di Carlo Zanzi E C S.A.S. (IT)
Pyrus communis L. · European pear
SEMPRA PRAHA A S
Solanum tuberosum L. · Potato
Johannes Martinus Kannegieter (J.M. Kannegieter)
Pyracantha M.J. Roem. · Firethorn
L'INSTITUT NATIONAL DE LA