This article is a list of diseases of Persian Walnuts (Juglans regia).
Bacterial diseases
Bacterial diseasesCrown gall Agrobacterium tumefaciensDeep bark canker Erwinia rubrifaciensShallow bark canker Erwinia (now Brenneria) nigrifluensWalnut blight Xanthomonas campestris pv. juglandis
Fungal diseases
Fungal diseasesAnthracnose Gnomonia leptostyla Marssonina juglandis [anamorph] Armillaria root rot Armillaria melleaBranch wilt Hendersonula toruloideaCotton root rot Phymatotrichopsis omnivora = Phymatotrichum omnivorumCylindrocarpon dieback Nectria radicicolaCylindrocarpon destructans [anamorph] = Cylindrocarpon radicicolaDowny leaf spot Microstroma juglandisMelanconium 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 parasiticaPhytophthora trunk and branch canker Phytophthora cactorum Phytophthora citricola Phytophthora citrophthora
Nematodes, parasitic
Nematodes, parasiticPin nematode Paratylenchus spp. Ring nematode Mesocriconema xenoplaxRoot lesion nematode Pratylenchus vulnusRoot knot nematode Meloidogyne spp.
Viral diseases
Viral diseasesBlackline genus Nepovirus, Cherry leaf roll virus (CLRV) Walnut ring spot genus Nepovirus, Cherry leaf roll virus (CLRV)
Miscellaneous diseases and disorders
Miscellaneous diseases and disordersAlternaria leaf spot Alternaria alternataApoplexy Unknown Ascochyta ring spot Ascochyta juglandisMesophyll collapse High temperature and low humidity Oilless nuts Unknown Pistillate flower abscission Excess pollen Stem/trunk canker Fusarium solani Botryosphaeria
References Common Names of Diseases, The American Phytopathological Society