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Diseases

Apple Powdery Mildew

Malus domestica (Suckow) Borkh.

A fungal disease of apple trees caused by the obligate parasite Podosphaera leucotricha. It is characterized by the appearance of a grey-white coating on young shoots, leaves, and inflorescences, causing them to deform and wither.

In the reference 1 127 varieties crop Apple, where this is mentioned in the description.

The pathogen is the fungus Podosphaera leucotricha (anamorph Oidium farinosum), which primarily infects non-lignified plant parts via haustoria. The pathogen overwinters as mycelium inside fruit and vegetative buds, from which infected shoots develop in the spring.

The disease manifests as a powdery coating, which eventually acquires a reddish hue. Affected leaves curl and lose turgidity, inflorescences become deformed and drop, and a characteristic 'russet netting' may form on the fruit.

In apple breeding for resistance to the pathogen, the introgression of specific genes, such as Pl-1, Pl-2, Pl-w, and Pl-d, plays a key role. Molecular marker methods are used to identify resistant genotypes, often in combination with scab immunity assessment.

General information about the subject — on the page Powdery mildew.

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.

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

Luresweet

Active

Malus domestica (Suckow) Borkh. · Apple

FR NL
13 records

Melrose

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR NL PL SI
19 records

Akane

Active

Malus domestica (Suckow) Borkh. · Apple

CZ ES FR NL PL SI
16 records

Discovery

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL PL SI
14 records

Zonga

Active

Malus domestica (Suckow) Borkh. · Apple

NL
9 records

Rubinstar

Active

Malus domestica (Suckow) Borkh. · Apple

BE DE FR NL PL
12 records

Freedom

Active

Malus domestica (Suckow) Borkh. · Apple

FR HU LT NL PL
13 records

Dalinbel

Active

Malus domestica (Suckow) Borkh. · Apple

FR NL
10 records

UEB 6581

Active

Malus domestica (Suckow) Borkh. · Apple

CZ
10 records

Bonita

Active

Malus domestica (Suckow) Borkh. · Apple

CZ
8 records

Admiral

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL
14 records

Tramin

Active

Malus domestica (Suckow) Borkh. · Apple

DE UA
9 records

Redspring

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL
10 records

Alkmene

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL SI
11 records

Shalimar

Active

Malus domestica (Suckow) Borkh. · Apple

CZ NL
15 records

Reanda

Active

Malus domestica (Suckow) Borkh. · Apple

DE HU UA
7 records

Lucy

Active

Malus domestica (Suckow) Borkh. · Apple

CZ
8 records

Winesap

Active

Malus domestica (Suckow) Borkh. · Apple

ES FR
7 records

Initial

Active

Malus domestica (Suckow) Borkh. · Apple

FR
7 records

Karneval

Active

Malus domestica (Suckow) Borkh. · Apple

CZ
13 records

Ariwa

Active

Malus domestica (Suckow) Borkh. · Apple

NL PL
10 records

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