en List of Persian walnut diseases

This article is a list of diseases of Persian Walnuts (Juglans regia).

Bacterial diseases

Bacterial diseases
Crown gall	Agrobacterium tumefaciens
Deep bark canker	Erwinia rubrifaciens
Shallow bark canker	Erwinia (now Brenneria) nigrifluens
Walnut blight	Xanthomonas campestris pv. juglandis

Fungal diseases
Anthracnose	Gnomonia leptostyla Marssonina juglandis [anamorph]
Armillaria root rot	Armillaria mellea
Branch wilt	Hendersonula toruloidea
Cotton root rot	Phymatotrichopsis omnivora = Phymatotrichum omnivorum
Cylindrocarpon dieback	Nectria radicicola Cylindrocarpon destructans [anamorph] = Cylindrocarpon radicicola
Downy leaf spot	Microstroma juglandis
Melanconium dieback	Melanconis carthusiana Melanconium juglandinum [anamorph]
Phytophthora crown and root rot	Phytophthora spp. Phytophthora cactorum Phytophthora cinnamomi Phytophthora citricola Phytophthora citrophthora Phytophthora cryptogea Phytophthora drechsleri Phytophthora megasperma Phytophthora nicotianae = Phytophthora parasitica
Phytophthora trunk and branch canker	Phytophthora cactorum Phytophthora citricola Phytophthora citrophthora

Viral diseases
Blackline	genus Nepovirus, Cherry leaf roll virus (CLRV)
Walnut ring spot	genus Nepovirus, Cherry leaf roll virus (CLRV)

Miscellaneous diseases and disorders
Alternaria leaf spot	Alternaria alternata
Apoplexy	Unknown
Ascochyta ring spot	Ascochyta juglandis
Mesophyll collapse	High temperature and low humidity
Oilless nuts	Unknown
Pistillate flower abscission	Excess pollen
Stem/trunk canker	Fusarium solani Botryosphaeria^[1]

^ Mazzaglia, A. "Bark Cankers on English Walnut: An Emerging Disease". Acta Horticulturae. International Society for Horticultural Science. Archived from the original on 2019-07-09.