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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.

Gorana

Active

Malus domestica (Suckow) Borkh. · Apple

Institute of Fruit Crops-Kyustendil

1 record

Faw 5878

Active

Malus domestica (Suckow) Borkh. · Apple

FAW Eidgenössische Forschunganstalt für Obst- Wein- und Gartenbau

1 record

Gilmer Fuji

Withdrawn

Malus domestica (Suckow) Borkh. · Apple

GILMER CHARLES^^^GILMER CYNTHIA

2 records

Gala Rossa

Active

Malus domestica (Suckow) Borkh. · Apple

THOMPSON G.W.

3 records

Enova

Terminated

Malus domestica (Suckow) Borkh. · Apple

Antonio Bergamini

2 records

Elegiya

Active

Malus domestica (Suckow) Borkh. · Apple

Institute of Fruit Crops-Kyustendil

1 record

Bay 3341

Active

Malus domestica (Suckow) Borkh. · Apple

Michael Neumüller

1 record

Besapara

Active

Malus domestica (Suckow) Borkh. · Apple

Institute of Fruit Crops-Kyustendil

1 record

AG 90

Active

Malus domestica (Suckow) Borkh. · Apple

CRA-W

1 record

Almagold

Active

Malus domestica (Suckow) Borkh. · Apple

Flavio Roberto De Salvador^^^Marco FONTANARI^^^Antonio Bergamini

2 records

Zita

Protection expired

Malus domestica (Suckow) Borkh. · Apple

CZ
1 record

Delvit

Protection expired

Malus domestica (Suckow) Borkh. · Apple

CZ
2 records

Zuzana

Protection expired

Malus domestica (Suckow) Borkh. · Apple

CZ
2 records

Tobias

Withdrawn

Malus domestica (Suckow) Borkh. · Apple

FI
1 record

Vitos

Protection expired

Malus domestica (Suckow) Borkh. · Apple

LT
1 record

Veritas

Active

Malus domestica (Suckow) Borkh. · Apple

HU
1 record

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