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
Heinrich Böhm
Solanum tuberosum L. · Potato
KWEEK-EN RESEARCHBEDRIJF AGRICO B.V., NL
Solanum tuberosum L. · Potato
Spijkman, Jan Lucas / Spijkman-Vergeer, Johanna Maria
Solanum tuberosum L. · Potato
ROCUS PIETER GRAVELAND
Malus domestica (Suckow) Borkh. · Apple
THE MAWLEY FAMILY TRUST
Malus domestica (Suckow) Borkh. · Apple
Maillard Arsene / Maillard Laurence
Solanum tuberosum L. · Potato
Lairy - Joly Gise'le
Malus domestica (Suckow) Borkh. · Apple
LAURENS FRANCOIS
Malus domestica (Suckow) Borkh. · Apple
Michelangelo Leis, Alessio Martinelli, Francesco Tagliani, Gianfranco Castagnoli (deceased)
Solanum tuberosum L. · Potato
STOL L.D. (US)
Solanum tuberosum L. · Potato
STAShEVSKI ZENON / ZAMALIEVA FANIYa FAJZRAHMANOVNA / GIMAEVA ELENA ALEKSEEVNA / VOLOGIN SEMEN GERMANOVICh / SALIHOVA ZIFA ZAKAR'EVNA / GIZATULLINA AL'BINA TALGATOVNA / NAZMIEVA REZIDA RYaZAKOVNA / SAFIULLINA GUL'GENA FLYuNOVNA / KUZ'MINOVA OL'GA ANDREEVNA
Malus domestica (Suckow) Borkh. · Apple
PALMER R.C. (CA)
Malus domestica (Suckow) Borkh. · Apple
Solanum tuberosum L. · Potato
ZIMMERMANN WILLI
Solanum tuberosum L. · Potato
JANSEN A.
Malus domestica (Suckow) Borkh. · Apple
STICHTING WAGENINGEN RESEARCH-WAGENINGEN PLANT RESEARCH
Solanum tuberosum L. · Potato
NORDKARTOFFELZUCHTGESELLSCHAFT
Solanum tuberosum L. · Potato
WOLF & WOLF BV (NL)
Malus domestica (Suckow) Borkh. · Apple
THE KENT INCORPORATED SOCIETY
Solanum tuberosum L. · Potato
Hettema Zonen Kweekbedrijf B.V.
Malus domestica (Suckow) Borkh. · Apple
Tupy Jaroslav|Prague, CZ / Louda Otto|Pencin u Liberce, CZ
Malus domestica (Suckow) Borkh. · Apple
Zima Jan, Louda Otto, Tupy Jaroslav,
Solanum tuberosum L. · Potato
Pomorsko Mazurska Hodowla Ziemniaka Sp.z o.o. z siedziba w Strzekecinie
Solanum tuberosum L. · Potato
Smeenge Research (NL)