This article is a list of diseases of hazelnut (Corylus avellana & Corylus spp.).
Bacterial diseases Bacterial diseasesBacterial blight Xanthomonas arboricola pv. corylinaBacterial canker Pseudomonas syringae pv avellanaeCrown gall Agrobacterium tumefaciens
Fungal diseases Fungal diseasesAnthracnose Piggotia coryli Monostichella coryli Gloeosporium coryli Labrella coryliArmillaria root disease Armillaria spp. Borro sec Cryptosporiopsis tarraconensisCytospora canker Cytospora spp. Eastern filbert blight Anisogramma anomalaKernel molds Mycosphaerella punctiformis [teleomorph] Ramularia sp. [anamorph] Phomopsis spp. Septoria ostryae Kernel spot Nematospora coryliLeaf blister Taphrina coryli Leaf spots Anguillosporella vermiformis Asteroma coryli Cercospora corylina Cercospora coryli Mamianiella coryli Monochaetia coryli Mycosphaerella punctiformis [teleomorph] Ramularia sp. [anamorph] Phyllosticta coryli Ramularia coryli Septoria ostryae Sphaceloma coryliNectria canker Nectria ditissimaTexas root rot Phymatotrichopsis omnivoraPowdery mildewErysiphe cornutae Erysiphe corylacearum Erysiphe coryli-americanae Phyllactinia guttataRust Pucciniastrum coryli
Viral diseases
Viral diseasesHazelnut mosaic genus Ilarvirus, Apple mosaic virus (ApMV) genus Ilarvirus, Prunus necrotic ringspot virus (PNRSV) genus Ilarvirus, Tulare apple mosaic virus (TAMV)
Phytoplasmal and spiroplasmal diseases
Phytoplasmal and spiroplasmal diseasesFilbert Stunt unknown, suspect a phytoplasma Hazelnut Yellows phytoplasma
Miscellaneous diseases and disorders
Miscellaneous diseases and disordersBlanks empty nut shells, cause unknown Brown Stain brown liquefied portions of shell and kernel, cause unknown Catkin Blast deformed catkins, cause unknown Sun Scald high temperature Wet Feet saturated soil conditions for extended periods.
References
Common Names of Diseases, The American Phytopathological Society