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Diseases

Apple Scab

Malus domestica (Suckow) Borkh.

A fungal disease of apple trees caused by the ascomycete fungus Venturia inaequalis, affecting all aerial parts of the plant. The disease manifests as characteristic dark spots with a velvety coating, causing fruit deformation, premature leaf drop, and reduced crop quality.

In the reference 1 949 varieties crop Apple, where this is mentioned in the description.

The pathogen is the highly specialized parasite Venturia inaequalis. The fungus's life cycle includes a teleomorph, which overwinters in fallen leaves, and an anamorph, Fusicladium dendriticum, responsible for secondary infection during the growing season. The disease affects leaves, petioles, pedicels, and fruits, on which spots with an olive-black coating form, leading to cracking and tissue deformation.

Genetic resistance of varieties to the pathogen is associated with Rvi loci. The most well-known is the Rvi6 gene, previously designated as Vf; however, the high variability of the fungal population has led to the emergence of race 6 of the pathogen, which is capable of overcoming this resistance. To ensure long-term immunity, breeding programs are focused on pyramiding several resistance genes, such as Rvi2, Rvi3, Rvi5, and Rvi15.

General information about the subject — on the page Scab.

Sources8

Varieties of Apple mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.

Malus domestica (Suckow) Borkh. · Apple

Luby, James / University of Minnesota

5 records

Malus domestica (Suckow) Borkh. · Apple

5 records

Malus domestica (Suckow) Borkh. · Apple

CHRIS LEE BRIAN EDWARDS ALLAN DELUGAR

8 records

Malus domestica (Suckow) Borkh. · Apple

STAYMAN (US)

ES FR
4 records

Malus domestica (Suckow) Borkh. · Apple

Yahagi Ryozo

FR NL
8 records

Malus domestica (Suckow) Borkh. · Apple

Prof. Jaroslav Tupy c/o Institute of Experimental Botany

DE
4 records

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)

FR
5 records

E756-36

Active

Malus domestica (Suckow) Borkh. · Apple

Katherine M. Evans

3 records

Malus domestica (Suckow) Borkh. · Apple

Ústav experimentální botaniky AV ČR, v.v.i. (CZ)

CZ
4 records

PICOL 1

Active

Malus domestica (Suckow) Borkh. · Apple

Prof. Dr. Christa Fischer / Dr. Andreas Peil im Inst. f. ZF an gartenb. Kulturen und Obst -Julius-Kühn-Institut-

DE
3 records

Malus domestica (Suckow) Borkh. · Apple

VAN MONS (FR)

FR
3 records

RAXINA 8

Active

Malus domestica (Suckow) Borkh. · Apple

INIA/SERIDA

ES
2 records

Malus domestica (Suckow) Borkh. · Apple

SERIDA

ES
4 records

Malus domestica (Suckow) Borkh. · Apple

SERIDA

ES
3 records

Malus domestica (Suckow) Borkh. · Apple

SERIDA

ES
3 records

Co-op 29

Active

Malus domestica (Suckow) Borkh. · Apple

Purdue Research Foundation (PRF)

3 records

Malus domestica (Suckow) Borkh. · Apple

SEDOV EVGENIJ NIKOLAEVICh / SEROVA ZOYa MIHAJLOVNA / ZhDANOV VLADILEN VASIL'EVICh / DOLMATOV EVGENIJ ALEKSEEVICh

3 records

Gala

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR HU NL PL +3
25 records

Galaxy

Active

Malus domestica (Suckow) Borkh. · Apple

BE DE ES FR HU NL
24 records

Idared

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR HU NL PL +2
22 records

Mutsu

Active

Malus domestica (Suckow) Borkh. · Apple

ES FR HU NL PL RO +1
23 records

Braeburn

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR HU NL SK
19 records

Melrose

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR NL PL SI
19 records

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