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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.

Marie Ménard

Active

Malus domestica (Suckow) Borkh. · Apple

Domaine Public (FR)

FR
2 records

Lochbuie

Active

Malus domestica (Suckow) Borkh. · Apple

William Turner (NZ)

FR
2 records

Lipno

Active

Malus domestica (Suckow) Borkh. · Apple

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

CZ
8 records

Ligol Redspur

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
4 records

Lembitu

Active

Malus domestica (Suckow) Borkh. · Apple

Estonian University of Life Sciences Institute of Agricultural and Environmental Sciences Polli Horticultural Research Centre

EE
4 records

Lakeland

Active

Malus domestica (Suckow) Borkh. · Apple

University of Minnesota (US)

FR
2 records

Ligol Spur

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
4 records

Lada

Active

Malus domestica (Suckow) Borkh. · Apple

TIHONOV NIKOLAJ NIKOLAEVICh / TOLMAChEVA ALEKSANDRA SEMENOVNA

CZ
2 records

Laila

Active

Malus domestica (Suckow) Borkh. · Apple

Rudolfs Dumbravs

LV
2 records

Kermerrien

Active

Malus domestica (Suckow) Borkh. · Apple

Domaine Public (FR)

FR
2 records

Kordona

Active

Malus domestica (Suckow) Borkh. · Apple

VÝZKUMNÝ A ŠLECHTITELSKÝ ÚSTAV OVOCNÁŘSKÝ HOLOVOUSY s.r.o. (CZ)

CZ
6 records

Koit

Active

Malus domestica (Suckow) Borkh. · Apple

Estonian University of Life Sciences Institute of Agricultural and Environmental Sciences Polli Horticultural Research Centre

EE
4 records

Judor

Active

Malus domestica (Suckow) Borkh. · Apple

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

FR
2 records

Jaune de Vitré

Active

Malus domestica (Suckow) Borkh. · Apple

Domaine Public (FR)

FR
2 records

Karamba

Active

Malus domestica (Suckow) Borkh. · Apple

Kalju Kask 100%

EE
4 records

Inese

Active

Malus domestica (Suckow) Borkh. · Apple

Rudolfs Dumbravs

LV
4 records

Idaredest

Active

Malus domestica (Suckow) Borkh. · Apple

Ines Róża Osiak-Wicha

PL
5 records

Helios

Active

Malus domestica (Suckow) Borkh. · Apple

Prof Dr Fischer (DE)

FR
4 records

Groseille

Active

Malus domestica (Suckow) Borkh. · Apple

Domaine Public (FR)

FR
2 records

Frequin rouge

Active

Malus domestica (Suckow) Borkh. · Apple

Domaine Public (FR)

FR
2 records

Free Redstar

Active

Malus domestica (Suckow) Borkh. · Apple

Instytut Ogrodnictwa - Państwowy Instytut Badawczy

PL
4 records

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