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Diseases of Black Walnut
(Juglans nigra L.)

J. H. Hart and J. E. Cummings Carlson, primary collators (last update 10/9/97)

Anthracnose

Gnomonia leptostyla (Fr.:Fr.) Ces. & DeNot.

(anamorph: Marssonina juglandis (Lib.) Magnus)

Bacterial blight

Xanthomonas juglandis (Pierce) Dows.

Cylindrocladium root rot

Cylindrocladium scoparium Morgan

(teleomorph: Calonectria kyotensis Terashita)

Cylindrocladiella parva (P. J. Anderson) Boesewinkel

= Cylindrocladium parvum P. J. Anderson

Fusarium canker

Fusarium sporotrichiodes Sherb.

Fusarium solani (Mart.) Saccardo

Fusarium lateritium Nees

Fusarium oxysporum Schlecht.

Leaf spot

Mycosphaerella juglandis K. J. Kessler

(anamorph: Cylindrosporium juglandis F. A. Wolf)

Mistletoe

Phoradendron flavescens (Pursh.) Nutti

Nectria canker

Nectria galligena Bres.

Nematodes, parasitic

Lesion nematodes, Pratylenchus musicola (Cobb) Filip.

Root-knot nematodes, Meloidogyne spp.

Phytophthora root rot

Phytophthora citricola Sawada

Phytophthora cinnamomi Rands

Seedling shoot dieback

Phomopsis arnoldiae Sutton

= P. elaeagni (J. C. Carter & Sacamano) R. H. Arnold &
    J. C. Carter

Walnut bunch

Phytoplasma organism

White mold

Microstroma juglandis (Berenger) Saccardo

White trunk rot

Phellinus igniarius (L.:Fr.) Quel.

Wood decay

Schizophyllum commune Fr.

Hypochnicium vellereum (Ellis & Cragin) Parm.

Trametes versicolor (L.:Fr.) Pilat

Phellinus gilvus (Schwein.:Fr) Pat.

Peniophora cinerea (Pers.:Fr.) Cooke

Hericium coralloides (Scop.:Fr.) S. F. Gray

Zonate leaf spot

Grovesinia pyramidalis M. Cline, J. L. Crane & S. Cline