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Diseases of European Hazelnut (Corylus avellana L.)
Hazelnut (Corylus spp.)

Jay W. Pscheidt and Jeffrey Stone, primary collators (last update 7/21/01)

BACTERIAL DISEASES

Bacterial blight

Xanthomonas arboricola pv. corylina (Miller, Bollen, Simmons, Gross & Barss 1940) Vauterin, Hoste, Kersters & Swings 1995

Bacterial canker

Pseudomonas syringae pv avellanae Psallidas 1993

Crown gall

Agrobacterium tumefaciens (Smith and Townsend 1907) Conn 1942

FUNGAL DISEASES

Anthracnose

Piggotia coryli (Desm.) Sutton

= Monostichella coryli (Desm.) Hohn.

= Gloeosporium coryli (Desm.) Sacc.

= Labrella coryli (Desm.) Sacc.

Armillaria root disease

Armillaria spp.

Borro sec

Cryptosporiopsis tarraconensis Gene, Guarro & Figueras

Cytospora canker

Cytospora spp.

Eastern filbert blight

Anisogramma anomala (Peck) E. Müller

Kernel molds

    Mycosphaerella punctiformis (Pers.:Fries) Starb.
        [teleomorph]

    Ramularia sp. [anamorph]

Phomopsis spp.

Septoria ostryae Peck

Kernel spot

Nemataspora coryli Peligon

Leaf blister

Taphrina coryli Nishida

Leaf spots

Anguillosporella vermiformis (Davis) Braun

Asteroma coryli (Fuckel) Sutton

Cercospora corylina Ray

C. coryli Montemartini

Mamianiella coryli (Batsch ex Fries) Höhn

Monochaetia coryli (Rostrup) Allescher

    Mycosphaerella punctiformis (Pers.:Fries) Starb.
        [teleomorph]

    Ramularia sp. [anamorph]

Phyllosticta coryli Westend

Ramularia coryi Chevassut

Septoria ostryae Peck

Sphaceloma coryli Vegh & Bourgeois

Nectria canker

Nectria ditissima Tul.

Texas root rot

Phymatotrichopsis omnivorum (Duggar) Hennebert

Powdery mildew

Microsphaera coryli Homma

M. ellisii U. Braun

M. hommae U. Braun

M. verruculosa Yu & Lai on various Corylus sp.

Phyllactinia guttata (Wallr.:Fr.) Lev.

= P. suffulta

Rust

Pucciniastrum coryli Komarov

VIRAL DISEASES

Hazelnut 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

Filbert Stunt

unknown, suspect a phytoplasma

Hazelnut Yellows

phytoplasma(s)

MISCELLANEOUS DISEASES & 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.