Return to Home Page

Integrated Pest Management · Agriculture and Natural Resources

University of California

Diseases of flowers

The table below lists plant host, disease common name, scientific name, and disease type for pests included in this Web site. Click on the common name to link to more information about the disease. Click on a table heading to sort the column. (requires Javascript)

To see a list of common pests and disorders of a particular plant, view the Flowers menu pages.

Descending = Ascending  Ascending= Descending  Unsorted= Unsorted

Plant or crop host Common name Scientific name Type
alyssum Clubroot Plasmodiophora brassicae Fungus
aster Leaf spot diseases Septoria spp. Fungus
aster Rust various Fungus
azalea Ovulinia petal blight Ovulinia azalea Fungus
barberton daisy Leaf spot diseases Alternaria gerberae Fungus
barberton daisy Leaf spot diseases Ascochyta gerberae Fungus
begonia Bacterial soft rots, leaf spots, blights, wilts Erwinia spp. Bacteria
begonia Leaf spot diseases Phyllosticta spp. Fungus
begonia Powdery mildew Golovinomyces cichoracearum Fungus
carnation Alternaria blight Alternaria spp. Fungus
carnation Armillaria root rot Armillaria mellea Fungus
carnation Bacterial soft rots, leaf spots, blights, wilts Pseudomonas spp. Bacteria
carnation Fairy-ring leaf spot Cladosporium echinulatum Fungus
carnation Leaf spot, Fairy-ring Cladosporium echinulatum Fungus
carnation Leaf spot, Septoria Septoria dianthi Fungus
carnation Septoria leaf spot Septoria dianthi Fungus
china aster Leaf spot diseases Septoria spp. Fungus
china aster Rust various Fungus
chrysanthemum Leaf spot, Septoria Septoria chrysanthemi Fungus
chrysanthemum Septoria leaf spot Septoria chrysanthemi Fungus
chrysanthemum Verticillium wilt Verticillium albo-atrum Fungus
chrysanthemum Verticillium wilt Verticillium dahliae Fungus
daffodil Dry rot Stromatinia gladioli Fungus
daffodil Smoulder Botrytis narcissicola Fungus
daffodil Smoulder Sclerotinia narcissicola Fungus
freesia Dry rot Stromatinia gladioli Fungus
geranium Alternaria leaf spot Alternaria alternata Fungus
geranium Leaf spot, Alternaria Alternaria alternata Fungus
gerbera daisy Leaf spot diseases Alternaria gerberae Fungus
gerbera daisy Leaf spot diseases Ascochyta gerberae Fungus
gladiolus Curvularia leaf spot Curvularia spp. Fungus
gladiolus Dry rot Stromatinia gladioli Fungus
gladiolus Leaf spot, Curvularia Curvularia spp. Fungus
gladiolus Leaf spot, Stemphylium Stemphylium spp. Fungus
gladiolus Scab Pseudomonas gladioli Fungus
gladiolus Stemphylium leaf spot Stemphylium spp. Fungus
iris Fire spot Heterosporium gracile Fungus
iris Ink spot Drechslera iridis Fungus
marigold Leaf spot diseases Alternaria spp. Fungus
nasturtium Clubroot Plasmodiophora brassicae Fungus
pansy Leaf spot diseases Alternaria spp. Fungus
pansy Leaf spot diseases Cercospora spp. Fungus
peony Leaf blotch Cladosporium paeoniae Fungus
primrose Leaf spot diseases Ramularia primulae Fungus
rhododendron Ovulinia petal blight Ovulinia azalea Fungus
snapdragon Leaf spot diseases Phyllosticta spp. Fungus
sunflower Powdery mildew Golovinomyces cichoracearum Fungus
sweet pea Ascochyta blight Ascochyta lathyri Fungus
sweet pea Leaf spot, Ramularia Ramularia deusta Fungus
sweet pea Ramularia leaf spot Ramularia deusta Fungus
transvaal daisy Leaf spot diseases Alternaria gerberae Fungus
transvaal daisy Leaf spot diseases Ascochyta gerberae Fungus
various flowers Armillaria root rot Armillaria mellea Fungus
various flowers Aster yellows none Phytoplasma
various flowers Bacterial soft rots, leaf spots, blights, wilts Xanthomonas spp. Bacteria
various flowers Botrytis blight (Gray mold) Botrytis cinerea Fungus
various flowers Crown gall Agrobacterium tumefaciens Bacteria
various flowers Downy mildew Plasmopara (syn. Peronospora) spp. Oomycete
various flowers Fasciation none Bacteria
various flowers Fusarium wilt Fusarium oxysporum Fungus
various flowers Gray mold (Botrytis blight) Botrytis cinerea Fungus
various flowers Leaf spot diseases various Fungus
various flowers Root, stem, and crown rot various Fungus
various flowers Rust Puccinia spp. Fungus
various flowers Verticillium wilt Verticillium albo-atrum Fungus
various flowers Viruses none Virus
verbena Leaf spot diseases Septoria verbenae Fungus
violet Leaf spot diseases Alternaria spp. Fungus
violet Leaf spot diseases Cercospora spp. Fungus
zinnia Leaf spot diseases Alternaria spp. Fungus
zinnia Leaf spot diseases Phyllosticta zinniae Fungus