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.
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Ascending 
= Descending 
= 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 |
