Integrated Pest Management

Other Diseases of Trees, Shrubs, and Vines

Host Disease Pathogen Occurrence
Arborvitae Root rot Phytophthora spp. Occasional
Ash Anthracnose Gloeosporium aridum Rare
Aspen Aspen leaf spot Marssonina populi Widespread
  Crown gall Agrobacterium tumefaciens Widespread
  Ink Spot Ciborinia whetzelii Mountains
  Perennial canker Cytospora sp. Widespread
  Powdery mildew Uncinula adunca Widespread
  Rust Melampsora sp. Occasional
  Shoot blight Venturia macularis Occasional
  White rot Ganoderma applanatum Widespread
  White trunk rot Phellinus tremulae Widespread
Birch Perennial canker Cytospora chrysosperma Widespread
Catalpa Wilt Verticillium albo-atrum Widespread
Chokecherry Black knot Apiosporina morbosum Widespread
  Plum pocket Taphrina sp. Occasional
  Powdery mildew Podosphaera oxycanthae Occasional
  Western X phytoplasma Widespread
Conifers Root rot Phytophthora sp. Widespread
  Seedling root rot Fusarium, Pythium Occasional
Cotoneaster Fire blight Erwinia amylovora Widespread
  Root rot Phytophthora spp. Widespread
Crab Apple Fire blight Erwinia amylovora Widespread
  Powdery mildew Podosphaera leucotricha Widespread
Elm Dutch elm disease Ceratocystis ulmi Northern Utah
  Slime flux, wetwood bacterial complex Widespread
  Wilt Verticillium albo-atrum Salt Lake
Euonymus Chlorosis, scorch nitrogen deficiency Widespread
  Crown gall Agrobacterium tumefaciens Widespread
  Powdery mildew Microsphaera alni Widespread
  Root rot Phytophthora spp. Widespread
Fir
(see also “conifers”)
Dwarf mistletoe Arceuthobium campylopodum Occasional
  Red ring rot Phellinus pini Widespread
  Fir broom rust Melampsorella caryophyllacearum Widespread
Forsythia Crown gall Agrobacterium tumefaciens Widespread
Goldenrain tree Nectria canker Nectria spp. Occasional
  Wilt Verticillium albo-atrum Occasional
Hawthorn Fire blight Erwinia amylovora Widespread
  Leaf spot Entomosporium sp. Occasional
  Rust Gymnosporangium nidus-avis Widespread
Honeylocust Canker Thyronectria austroamericana Occasional
Juniper
("cedar")
Root rot Phytophthora spp. Widespread
  Rust Gymnosporangium spp. Occasional
Lilac Bacterial blast Pseudomonas syringae Occasional
  Powdery mildew Microsphaera; Phyllactinia Widespread
Linden Sooty mold Saprophytic fungi Widespread
  Wilt Verticillium albo-atrum Widespread
Maple Anthracnose Kabatiella apocryta Rare
  Canker Cytosporella sp. Cache
  Fasciation genetic, virus? Occasional
  Leaf blister Taphrina sacchari Occasional
  Leaf tatter genetic, virus? Occasional
  Edema (oedema) environmental (high humidity) Occasional
  Tar spot Rhytisma punctatum Mountains
  Wilt Verticillium albo-atrum Widespread
Mountain Ash Fire blight Erwinia amylovora Widespread
  Perennial canker Cytospora spp. Widespread
Oak Anthracnose Gnomonia veneta Salt Lake
  Leaf blister Taphrina caerulescens Occasional
  Perennial canker Cytospora sp. Occasional
  Powdery mildew Sphaerotheca lanestris Davis
Pine
(see also conifers)
Western gall rust Cronartium harkesii Occasional
Poplar Crown gall Agrobacterium tumefaciens Widespread
  Perennial canker Cytospora sp. Widespread
  Poplar leafspot Marssonina populi Widespread
  Root rot Pythium sp. Widespread
  Slime flux, wetwood bacterial complex Widespread
Pyracantha Fire blight Erwinia amylovora Widespread
Serviceberry Rust Gymnosporangium sp. Widespread
Squaw Bush
(Rhus trilobata)
Leaf spot Entomosporium sp. Widespread
  Wilt Verticillium albo-atrum Widespread
  Perennial canker Cytospora sp. Occasional
Sycamore Anthracnose Gnomonia veneta Widespread
  Leaf tatter, shothole insect, Plant bug Widespread
  Powdery mildew Microsphaera alni Widespread

Precautionary Statement: Utah State University and its employees are not responsible for the use, misuse, or damage caused by application or misapplication of products or information mentioned in this document. All pesticides are labeled with ingredients, instructions, and risks, and not all are registered for edible crops. “Restricted use” pesticides may only be applied by a licensed applicator. The pesticide applicator is legally responsible for proper use. USU makes no endorsement of the products listed in this publication.