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
FISCHER MANFRED / MURAWSKI HEINZ / SCHMADLAK JOHANN
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE & CO.KGAA
Malus domestica (Suckow) Borkh. · Apple
Gospodarstwo Szkółkarskie Andrzej i Szymon Nowakowscy
Solanum tuberosum L. · Potato
ZPC
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Malus domestica (Suckow) Borkh. · Apple
TYDEMAN E.M. (GB)
Solanum tuberosum L. · Potato
Stephan Berger^^^JOSEF BERGER
Solanum tuberosum L. · Potato
NIEHOFF| Dr. Karl-Heinrich Niehoff
Cucumis sativus L. · Cucumber
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Solanum tuberosum L. · Potato
Hodowla Ziemniaka Zamarte sp. z o.o. - Grupa IHAR
Malus domestica (Suckow) Borkh. · Apple
SURKIJN Romain (BE)/Pepinieres Rene Nicolai SA (BE)
Solanum tuberosum L. · Potato
Y.P. van der Werff/ZPC
Malus Mill. · Apple
Sandidge, Jr., Charles R.|5618 Entiat River Rd., Entiat, WA 98822
Malus domestica (Suckow) Borkh. · Apple
SEMPRA PRAHA A S
Beta vulgaris Sugar Beet Group · Sugar beet
Dietrich Hauer, Madlaina Peter,
Malus Mill. · Apple
Jan Blazek c/o VSUO Holovousy
Solanum tuberosum L. · Potato
Niederösterreichische Saatbaugenossenschaft reg.Gen.m.b.H.
Malus domestica (Suckow) Borkh. · Apple
Prof. Jaroslav Tupy c/o Institute of Experimental Botany
Malus Mill. · Apple
Jaroslav Tupy Institute of Experimental Botany / Otto Louda Institute of Experimental Botany
Pyrus communis L. · European pear
Pyrus communis L. · European pear
Solanum tuberosum L. · Potato
Remy BIGOT (FR)/Federation des Syndicats Bretons (FR)
Solanum tuberosum L. · Potato
Fobek B.V., Broer A.J. Siderius, Potato Masters Picardie S.A.S., Tuberosum Technologies Inc.