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.
Brassica juncea (L.) Czern. · Brown mustard
LOCHOW| KWS LOCHOW GMBH
Solanum tuberosum L. · Potato
SOLTAU| Raiffeisen Centralheide eG
Solanum tuberosum L. · Potato
VERENIGDE KWEEKBEDRIJVEN (NL)
Malus domestica (Suckow) Borkh. · Apple
ROY (US)
Malus domestica (Suckow) Borkh. · Apple
YOSHIDA| Yoshio Yoshida c/o Divison of Fruit Breeding Fruit Tree Research Station / HANIUDA| Tadayuki Haniuda c/o Laboratory of Biotechnology Agricultural Research Center / TSUCHIYA| Shichiro Tsuchiya c/o Laboratory of Fruit BreedingFruit Tree Research St
Solanum tuberosum L. · Potato
Federation des Syndicats Bretons (FR)
Solanum tuberosum L. · Potato
SLOOTS| R.H. Sloots
Cucumis sativus L. · Cucumber
Sakata Seed Corporation
Solanum tuberosum L. · Potato
Potato Seed Solutions
Solanum tuberosum L. · Potato
Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)
Cucumis sativus L. · Cucumber
KUBICKI B. / ANGELUS W. / ZURADZKA I. / SEK S.
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Pyrus communis L. · European pear
SEMPRA PRAHA A S
Malus Mill. · Apple
PURDUE RESEARCH FOUNDATION
Solanum tuberosum L. · Potato
SAATZUCHT FRITZ LANGE KG, DE
Malus domestica (Suckow) Borkh. · Apple
THE KENT INCORPORATED SOCIETY
Cucumis sativus L. · Cucumber
PRZEDSIEBIORSTWO NASIENNICTWA OGRODNICZEGO I SZKOLKARSTWA
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Cucumis sativus L. · Cucumber
NUNHEMS
Solanum tuberosum L. · Potato
ZIMMERMANN (DE)/INCONNU (FR)
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Solanum tuberosum L. · Potato
W.WALLMULLER
Solanum tuberosum L. · Potato
BOERHAVE VOF
Malus domestica (Suckow) Borkh. · Apple
University of Arkansas