Diseases
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.
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
STICHTING WAGENINGEN RESEARCH-WAGENINGEN PLANT RESEARCH
Malus domestica (Suckow) Borkh. · Apple
Washington State University, USA
Malus domestica (Suckow) Borkh. · Apple
Ústav experimentální botaniky AV ČR, v.v.i. (CZ)
Malus domestica (Suckow) Borkh. · Apple
Wilton Weert B.V. (NL)
Malus domestica (Suckow) Borkh. · Apple
Smith, T., Smith, M. A.
Malus domestica (Suckow) Borkh. · Apple
Vivaisti, I
Malus domestica (Suckow) Borkh. · Apple
Sundermeyer Gerhard
Malus domestica (Suckow) Borkh. · Apple
Washington State University Research Foundation
Malus domestica (Suckow) Borkh. · Apple
New Jersey Agri Exp Stat (US)
Malus domestica (Suckow) Borkh. · Apple
WESTERN AUSTRALIAN DEPARTMENT OF AGRICULTURE
Malus domestica (Suckow) Borkh. · Apple
Wageningen Plant Research, NL
Malus domestica (Suckow) Borkh. · Apple
Plants for Europe Ltd
Malus domestica (Suckow) Borkh. · Apple
Telisa Grille
Malus domestica (Suckow) Borkh. · Apple
Veleminsky, Jiri
Malus domestica (Suckow) Borkh. · Apple
White Allan
Malus domestica (Suckow) Borkh. · Apple
YVES LESPINASSE
Malus domestica (Suckow) Borkh. · Apple
THE KENT INCORPORATED SOCIETY
Malus domestica (Suckow) Borkh. · Apple
Zima Jan, Louda Otto, Tupy Jaroslav,
Malus domestica (Suckow) Borkh. · Apple
White Allan
Malus domestica (Suckow) Borkh. · Apple
Thomas Braun
Malus domestica (Suckow) Borkh. · Apple
Station de Geneva (US)
Malus domestica (Suckow) Borkh. · Apple
Malus domestica (Suckow) Borkh. · Apple
T. Visser I.V.T.
Malus domestica (Suckow) Borkh. · Apple
WESTERN AUSTRALIAN DEPARTMENT OF