This article is a list of diseases of hazelnut

Hazelnut

A hazelnut is the nut of the hazel and is also known as a cob nut or filbert nut according to species. A cob is roughly spherical to oval, about 15–25 mm long and 10–15 mm in diameter, with an outer fibrous husk surrounding a smooth shell. A filbert is more elongated, being about twice...

 (Corylus avellana & Corylus spp.).

Bacterial diseases

Bacterial diseases
Bacterial blight	Xanthomonas arboricola Xanthomonas arboricola Xanthomonas arboricola is a species of proteobacteria.... pv. corylina
Bacterial canker	Pseudomonas syringae Pseudomonas syringae Pseudomonas syringae is a rod shaped, Gram-negative bacterium with polar flagella. It is a plant pathogen which can infect a wide range of plant species, and exists as over 50 different pathovars, all of which are available to legitimate researches via international culture collections such as the... pv avellanae
Crown gall	Agrobacterium tumefaciens Agrobacterium tumefaciens Agrobacterium tumefaciens is the causal agent of crown gall disease in over 140 species of dicot. It is a rod shaped, Gram negative soil bacterium...

Fungal diseases

{| class="wikitable" style="clear"
! colspan=2| Fungal diseases

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|Anthracnose
||
Piggotia coryli
Labrella coryli

Labrella coryli

Labrella coryli is an ascomycete fungus that is a plant pathogen that causes anthracnose on hazlenut.- External links :* *...

|-
|Armillaria root disease
||Armillaria spp.
|-
|Borro sec
||Cryptosporiopsis tarraconensis

Cryptosporiopsis tarraconensis

Cryptosporiopsis tarraconensis is a plant pathogen.- External links :* *...

|-
|Cytospora canker
||Cytospora

Cytospora

Cytospora is a genus of ascomycete fungi. Cytospora species are known as plant pathogens.-External links:*...

spp.
|-
|Eastern filbert blight
||Anisogramma anomala

Anisogramma anomala

Anisogramma anomala is a plant pathogen that causes a disease known as Eastern filbert blight on Corylus spp. . Symptoms include the formation of cankers on twigs. It is a particular problem on Corylus avellana which is farmed commercially. It is native to North America. The spores are spread by...

|-
|Kernel molds
||
Mycosphaerella punctiformis

Mycosphaerella punctiformis

Mycosphaerella punctiformis is a fungal plant pathogen.-External links:* *...

[teleomorph]

Ramularia

Ramularia

Ramularia is a genus of ascomycete fungi. Its species, which are anamorphs of the genus Mycosphaerella, are plant pathogens....

sp. [anamorph]

Phomopsis

Phomopsis

Phomopsis is a genus of ascomyceta fungi.-Species:Species include:* Phomopsis arnoldiae* Phomopsis asparagi* Phomopsis asparagicola* Phomopsis cannabina* Phomopsis caricae-papayae* Phomopsis coffeae* Phomopsis elaeagni...

spp.

Septoria ostryae

Septoria ostryae

Septoria ostryae is a fungal plant pathogen.- External links :* *...

|-
|Kernel spot
||Nematospora coryli

Nematospora coryli

Nematospora coryli is a plant pathogen that causes stigmatomycosis. It is cultivated on potato dextrose agar and grows as yeast-like oval or spherical budding cells either isolated or in short chains and has few hyphae which are septate at maturity...

|-
|Leaf blister
||Taphrina coryli

Taphrina coryli

Taphrina coryli is an ascomycete fungus that is a plant pathogen.- External links :* *...

|-
|Leaf spots
||
Anguillosporella vermiformis

Anguillosporella vermiformis

Anguillosporella vermiformis is an ascomycete fungus that is a plant pathogen.- External links :* *...

Asteroma coryli

Asteroma coryli

Asteroma coryli is a plant pathogen that causes leaf spot on hazlenut.- External links :* *...

Cercospora corylina

Cercospora corylina

Cercospora corylina is a fungal plant pathogen.- External links :**...

Cercospora coryli

Mamianiella coryli

Mamianiella coryli

Mamianiella coryli is a plant pathogen.- External links :* *...

Monochaetia coryli

Monochaetia coryli

Monochaetia coryli is a plant pathogen.- External links :* *...

Mycosphaerella punctiformis

Mycosphaerella punctiformis

Mycosphaerella punctiformis is a fungal plant pathogen.-External links:* *...

[teleomorph]

Ramularia

Ramularia

Ramularia is a genus of ascomycete fungi. Its species, which are anamorphs of the genus Mycosphaerella, are plant pathogens....

sp. [anamorph]

Phyllosticta coryli

Phyllosticta coryli

Phyllosticta coryli is a plant pathogen.- External links :**...

Ramularia coryli

Ramularia coryli

Ramularia coryli is a fungal plant pathogen.-External links:**...

Septoria ostryae

Septoria ostryae

Septoria ostryae is a fungal plant pathogen.- External links :* *...

Sphaceloma coryli

Sphaceloma coryli

Sphaceloma coryli is a plant pathogen.- External links :* *...

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|Nectria canker
||Nectria ditissima

Nectria ditissima

Nectria ditissima is a fungal plant pathogen.- External links :* *...

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|Texas root rot
||Phymatotrichopsis omnivora
|-
|Powdery mildew
||Microsphaera coryli

Microsphaera coryli

Microsphaera coryli is a plant pathogen.- External links :* *...

Microsphaera ellisii

Microsphaera ellisii

Microsphaera ellisii is a plant pathogen.- External links :* *...

Microsphaera hommae

Microsphaera hommae

Microsphaera hommae is a plant pathogen.- External links :* *...

Microsphaera verruculosa

Microsphaera verruculosa

Microsphaera verruculosa is a plant pathogen.- External links :* *...

Phyllactinia guttata

Phyllactinia guttata

Phyllactinia guttata is a species of fungus in the Erysiphaceae family; the anamorph of this species is Ovulariopsis moricola. A plant pathogen distributed in temperate regions, P...

Viral diseases

{| class="wikitable" style="clear"
! colspan=2| Viral diseases

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|Hazelnut mosaic
||genus Ilarvirus

Ilarvirus

Ilarvirus is a genus of viruses.-External links:*...

, Apple mosaic virus

Apple mosaic virus

Apple mosaic virus is a plant pathogenic virus of the family Bromoviridae.-External links:**...

 (ApMV)

genus Ilarvirus

Ilarvirus

Ilarvirus is a genus of viruses.-External links:*...

, Prunus necrotic ringspot virus

Prunus necrotic ringspot virus

Prunus necrotic ringspot virus is a plant pathogenic virus of the family Bromoviridae. It is known to attack cherry trees among others. In the cherry tree it results in lower yields, and if concurrent with cherry leaf roll virus, results in a rapid decline.-External links:**...

 (PNRSV)

genus Ilarvirus

Ilarvirus

Ilarvirus is a genus of viruses.-External links:*...

, Tulare apple mosaic virus

Tulare apple mosaic virus

Tulare apple mosaic virus is a plant pathogenic virus of the family Bromoviridae.-External links:**...

 (TAMV)
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|}

Phytoplasmal and spiroplasmal diseases

{| class="wikitable" style="clear"
! colspan=2| Phytoplasmal and spiroplasmal diseases

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|Filbert Stunt
||unknown, suspect a phytoplasma
|-
|Hazelnut Yellows
||phytoplasma

Phytoplasma

Phytoplasma are specialised bacteria that are obligate parasites of plant phloem tissue and transmitting insects . They were first discovered by scientists in 1967 and were named mycoplasma-like organisms or MLOs. They cannot be cultured in vitro in cell-free media...

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Miscellaneous diseases and disorders

{| class="wikitable" style="clear"
! colspan=2| Miscellaneous diseases and disorders

|-
|Blanks
||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.
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