Fungal diseases
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| Anthracnose | Asteroma inconspicuum = Gloeosporium inconspicuum
Gloeosporium ulmicola |
Armillaria root rot
Shoestring root rot | Armillaria mellea
Rhizomorpha subcorticalis [anamorph] |
| Blackspot | Asteroma ulmeum = Gloeosporium ulmeum
Stegophora ulmea [teleomorph] = Gnomonia ulmea |
| Botryodiplodia canker | Sphaeropsis ulmicola = Botryodiplodia hydrodermia |
| Botryosphaeria canker | Botryosphaeria dothidea
Fusicoccum aesculi [anamorph] |
| British tar spot | Dothidella ulmi |
| Chalara root rot | Chalara thielavioides |
| Coniothyrium canker | Coniothyrium spp.
Coniothyrium celtidis-australis Leptosphaeria coniothyrium Diapleella coniothyrium [anamorph] |
| Cytospora canker | Cytospora chrysosperma
Valsa sordida [anamorph] Cytospora leucosperma = Cytospora ambiens Valsa ambiens [anamorph] Cytospora nivea Leucostoma nivea [anamorph] |
| Cytosporina canker | Cytosporina ludibunda |
| Damping-off, Fusarium | Fusarium spp. |
| Damping-off, Pythium | Pythium ultimum |
| Damping-off, Rhizoctonia | Rhizoctonia solani
Thanatephorus cucumeris [teleomorph] |
| Decay (xylem) | Trametes versicolor = Coriolus versicolor
Flammulina velutipes Ganoderma applanatum = Fomes applanatus Phellinus spp. = Fomes spp. Pleurotus spp. Polyporus squamosus Other basidiomycetes |
| Discoloration (xylem) | Deuteromycetes |
| Dothiorella canker and wilt | Dothiorella ulmi |
| Dutch elm disease | Ophiostoma ulmi = Ceratocystis ulmi
Pesotum ulmi [anamorph] = Graphium ulmi Ophiostoma novo-ulmi |
| Leaf blister | Taphrina ulmi |
| Mistletoe (infection) | Phoradendron serotinum = Phoradendron flavescens
Phoradendron tomentosum Viscum album |
| Nectria canker | Nectria spp.
Nectria cinnabarina Tubercularia vulgaris [anamorph] Nectria coccinea Cylindrocarpon candidum [anamorph] Nectria ditissima Cylindrocarpon willkommii [anamorph] Nectria galligena Cylindrocarpon heteronemum [anamorph] |
| Phoma canker | Phoma glomerata = Phoma conidiogena |
| Phomopsis canker | Phomopsis oblonga
Diaporthe eres [teleomorph] |
| Phymatotrichum root rot (cotton root rot/Texas Root Rot) | Phymatotrichopsis omnivora = Phymatotrichum omnivorum |
| Phytophthora canker (pit canker) | Phytophthora inflata |
| Phytophthora root rot | Phytophthora megasperma |
| Powdery mildew | Microsphaera penicillata = M. alni
Phyllactinia angulata = Phyllactinia corylea var. angulata Phyllactinia guttata Oidium sp. [anamorph] Uncinula macrospora Uncinula parvula Uncinuliella flexuosa |
| Schizoxylon canker | Schizoxylon microsporum |
| Sooty mold | Perisporiaceae (Ascomycetes): numerous dark-spored fungi imperfecti |
| Thyrostroma canker | Stigmina compacta = Thyrostroma compactum |
| Tubercularia canker | Tubercularia ulmea |
| Verticillium wilt | Verticillium albo-atrum
Verticillium dahlia |
| Violet root rot | Helicobasidium brebissonii
Rhizoctonia crocorum [anamorph] |
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