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 domestica (Suckow) Borkh. · Apple
Instytut Sadownictwa i Kwiaciarstwa im. Szczepana Pieniążka
Solanum tuberosum L. · Potato
Saka Pflanzenzucht GmbH Co KG
Malus domestica (Suckow) Borkh. · Apple
Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)
Solanum tuberosum L. · Potato
Kweek- en Researchbedrijf Agrico B.V.
Solanum tuberosum L. · Potato
SOLANA SEEDS UNITED KINGDOM LTD. UNIT 4
Cucumis sativus L. · Cucumber
Enza Zaden Beheer B.V.
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Malus domestica (Suckow) Borkh. · Apple
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum tuberosum L. · Potato
C. Meijer B.V.
Cucumis sativus L. · Cucumber
Johnny's Selected Seeds
Solanum tuberosum L. · Potato
Freerk Zwart Tuinservice & Agrarische Dienstverlening^^^Fobek B.V.
Cucumis sativus L. · Cucumber
Ikasido Global Group B.V
Malus domestica (Suckow) Borkh. · Apple
Malus domestica (Suckow) Borkh. · Apple
Institut Français des Productions Cidricoles (I.F.P.C.), Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)
Malus Mill. · Apple
Jozef Morren c/o Jomobel N.V.
Solanum tuberosum L. · Potato
Zsolt Géza Polgár^^^István Wolf^^^János Pintér^^^Miklós Lönhard^^^Zsolt Vaszily
Solanum tuberosum L. · Potato
HERVE DUBREUIL_
Solanum tuberosum L. · Potato
Vesa Velhartice a.s.
Solanum tuberosum L. · Potato
Johan Martijn Kannegieter, Harm Kannegieter
Malus domestica (Suckow) Borkh. · Apple
Simone Bühlmann-Schütz Agroscope
Malus domestica (Suckow) Borkh. · Apple
SEMPRA PRAHA A S
Solanum tuberosum L. · Potato
Saka Pflanzenzucht GmbH Co KG
Cucumis sativus L. · Cucumber
Przedsiębiorstwo Nasiennictwa Ogrodniczego i Szkółkarstwa Spółka Akcyjna w upadłości likwidacyjnej \Instytut Ogrodnictwa - Państwowy Instytut Badawczy