Diseases
Juglans regia L.
Walnut blight, caused by Xanthomonas arboricola pv. juglandis, affects all above-ground plant organs, leading to necrosis, fruit rot, and nut drop.
In the reference 83 varieties crop Persian walnut, where this is mentioned in the description.
The primary pathogen of the disease is the bacterium Xanthomonas arboricola pv. juglandis. The pathogen attacks buds, leaves, flowers, and fruits. On fruits, the infection manifests as small black spots that enlarge and cause shriveling of the husk; in the case of early infection, the bacteria penetrate into the kernel, causing it to rot and subsequently leading to fruit drop.
On leaves, the bacterial disease is expressed by the appearance of dark spots, often delimited by veins or located along the margins of the blade, which leads to their deformation. Cankers form on shoots, and affected buds often fail to open and dry out. Under high humidity conditions, exudate may be released on the affected tissue areas in the form of black streaks.
General information about the subject — on the page Bacterial diseases.
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.
Juglans regia L. · Persian walnut
Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)
Juglans regia L. · Persian walnut
Institut National de Recherche pour l'Agriculture l'Alimentation et l'Environnement (INRAE)
Juglans regia L. · Persian walnut
Pepinieres de Lalanne, F
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
ROMINGER EMILPETRE LUDOVIC
Juglans regia L. · Persian walnut
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Juglans regia L. · Persian walnut
Stefan Gandev, Argir Zhivondov
Juglans regia L. · Persian walnut
Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Juglans regia L. · Persian walnut
A. Zhivondov, N. Nedev, I. Yovchev, M. Ivanova
Juglans regia L. · Persian walnut
Sullivan, Charles Edward
Juglans regia L. · Persian walnut
INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut
Juglans regia L. · Persian walnut