How to Manage Pests

Pests in Gardens and Landscapes

Fungal Leaf Spots and the Hosts They Infect

Anthracnose
Discula fraxinea, on ash
Elsinoe corni, on dogwood
Gloesporium quercum
, on oak
Apiognomonia veneta, on sycamore
Marssonia spp.
Aspen, Cottonwood, Poplar, Willow

Ascochyta spp.
Clematis, Gerbera daisy

Alternaria leaf spot (Alternaria alternata):
Geranium, Marigold, Pansy, Zinnia

Mycosphaerella spp.
Aspen, Cottonwood, Iris, Poplar, Rose
Cercospora spp.
Aspen, Cottonwood, Pansy, Poplar
Phyllosticta spp.
Andromeda, Aucuba, Begonia, Boxwood, Magnolia, Maple, Rhodedendron, Snapdragon, Zinnia
Curvularia leaf spot (Curvularia lunata, C. trifoli)
Gladiolus
Ramularia spp.
Primrose, Sweet pea
Entomosporium leaf spot (Entomosporium spp.)
Apple, Flowering crab apple, Evergreen pear, Hawthorn, Pear, Photinia, Pyracantha, Quince, Rhaphiolepis, Serviceberry, Toyon
Scabs (Spilocaea and Venturia spp.)
Apple, Coffeeberry, Cottoneaster, Maple, Pear, Poplar, Pyracantha, Toyon, Willow
Fairy-ring leaf spot (Cladosporium (=Heterosporium) echinulatum)
Carnation
Septoria leaf spot (Septoria spp.)
Aspen, Aster, Azalea, Carnation, Chrysanthemum, Cottonwood, Hebe, Poplar, Verbena
Fire spot (Heterosporium gracile)
Iris
Shot hole (Wilsonomyces carpophilus )
Prunus species such as Almond, Apricot, Plum
Ink spot (Drechslera or Bipolaris iridis)
Iris
Sphaceloma spp.
Rose
Leaf blotch (Cladosporium paeoniae)
Peony
Stemphylium leaf spot (Stemphylium spp.)
Gladiolus
Macrophoma spp.
Boxwood
Tar spot (Rhytisma spp.)
Maple, Tulip tree, Yellow poplar

Statewide IPM Program, Agriculture and Natural Resources, University of California
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