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 Mill. · Apple
Sächsische Landesanstalt für Landwirtschaft
Solanum tuberosum L. · Potato
Winfried Lange, Frank Lange
Solanum tuberosum L. · Potato
UNICOPA/CLAUSE
Malus Mill. · Apple
Kiddle, Kenneth W.|Hawkes Bay, New Zealand
Solanum tuberosum L. · Potato
Saka-Ragis (DE)
Prunus domestica L. · European plum
Viktor Trajkovski
Solanum tuberosum L. · Potato
Heinrich Böhm
Cucumis sativus L. · Cucumber
Rijk Zwaan Budapest, H
Solanum tuberosum L. · Potato
Kweekbedrijf-Zpc (NL)
Pyrus communis L. · European pear
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.
Solanum tuberosum L. · Potato
Teagasc
Malus domestica (Suckow) Borkh. · Apple
Solanum tuberosum L. · Potato
GERMICOPA S.A.S
Solanum tuberosum L. · Potato
Teagasc Crops Research Centre
Solanum tuberosum L. · Potato
PLANT BREEDING INTERNATIONAL CAMBRIDGE
Solanum tuberosum L. · Potato
van Loon, J.P.
Solanum tuberosum L. · Potato
Ludwig Simon
Malus domestica (Suckow) Borkh. · Apple
SANDIDGE JR. - CHARLES R.
Malus domestica (Suckow) Borkh. · Apple
VÝZKUMNÝ A ŠLECHTITELSKÝ ÚSTAV OVOCNÁŘSKÝ HOLOVOUSY s.r.o. (CZ)
Malus domestica (Suckow) Borkh. · Apple
Beta vulgaris Garden Beet Group · Garden beet
BEJO ZADEN
Cucumis sativus L. · Cucumber
Monsanto Vegetable IP Management B.V.
Solanum tuberosum L. · Potato
Peter Leonard Oldenkamp