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Diseases

Bacterial blight of walnut

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.

Sources8

Varieties of Persian walnut 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.

Fernet

Active

Juglans regia L. · Persian walnut

Ahronomichnyi Nats. Doslidnyts`kyiinstytut Frantsi

UA
1 record

Bonifac

Active

Juglans regia L. · Persian walnut

Szentivanyi Peter

HU
2 records

Kodrene

Terminated

Juglans regia L. · Persian walnut

Komanych Ion Heorhiiovych

UA
1 record

Fereynet

Application submitted

Juglans regia L. · Persian walnut

INSTITUT NATIONAL DE LA RECHERCHE AGRONOMIQUE, FR

FR
1 record

Mila

Active

Juglans regia L. · Persian walnut

BF-LJ agr. sadjarstvo MB (SI)

SI
1 record

Verdot

Terminated

Juglans regia L. · Persian walnut

INCONNU (FR)

FR
1 record

Rego

Active

Juglans regia L. · Persian walnut

2 records

Geoagiu 65

Active

Juglans regia L. · Persian walnut

RO
1 record

CERVINARA

Active

Juglans regia L. · Persian walnut

1 record

Urozhajnyj

Active

Juglans regia L. · Persian walnut

1 record

CHASE D/9

Active

Juglans regia L. · Persian walnut

1 record

LOMPOC

Active

Juglans regia L. · Persian walnut

1 record

FRENI 1

Active

Juglans regia L. · Persian walnut

1 record

FK5

Active

Juglans regia L. · Persian walnut

1 record

Srem

Protection expired

Juglans regia L. · Persian walnut

PF N. Sad vocarstvo (YU)

SI
1 record

XERTA 119

Active

Juglans regia L. · Persian walnut

1 record

XERTA122

Active

Juglans regia L. · Persian walnut

1 record