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
Chantal Lorentz^^^Pierre Billant^^^Bretagne-Plants S.C.I.C.A.
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Malus domestica (Suckow) Borkh. · Apple
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Solanum tuberosum L. · Potato
Justus Böhm
Solanum tuberosum L. · Potato
Interseed Potatoes GmbH
Malus domestica (Suckow) Borkh. · Apple
ZOUK bvba, BE3800 Sint-Truiden
Solanum tuberosum L. · Potato
SCOTTISH CROP RESEARCH INSTITUTE
Malus domestica (Suckow) Borkh. · Apple
Michelangelo Leis^^^Alessio Martinelli
Solanum tuberosum L. · Potato
Solanum International Inc.
Solanum tuberosum L. · Potato
Dr Paul Watts, The Department of Agriculture and Rural Development for Northern Ireland
Malus domestica (Suckow) Borkh. · Apple
Horticulture & Food Research Institute of New Zealand Ltd
Solanum tuberosum L. · Potato
University of Idaho
Malus domestica (Suckow) Borkh. · Apple
Jan Zima Institute of Experimental Botany / Jaroslav Tupy Institute of Experimental Botany / Otto Louda Institute of Experimental Botany / Radek Cerny Institute of Experimental Botany
Solanum tuberosum L. · Potato
ROBERT HOOPES
Solanum tuberosum L. · Potato
Solanum International Inc.
Malus domestica (Suckow) Borkh. · Apple
Markus Kobelt
Malus domestica (Suckow) Borkh. · Apple
RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE DOCHERNEE UNITARNOE PREDPRITIE «INSTITUT PLODOVODSTVA»
Pyrus communis L. · European pear
Graminor AS, N-2322 Ridabu
Malus Mill. · Apple
Warren Keith S.
Malus domestica (Suckow) Borkh. · Apple
De Wit Inge / Eyssen Hendrik / Keulemans Johan / Nicolai Johan / Pauwels Els / Laer Paul Van
Malus domestica (Suckow) Borkh. · Apple
RESPUBLIKANSKOE NAUCHNO-PROIZVODSTVENNOE DOCHERNEE UNITARNOE PREDPRITIE «INSTITUT PLODOVODSTVA»
Malus domestica (Suckow) Borkh. · Apple
University of Arkansas
Malus Mill. · Apple
Warren Keith S.