Articles

Cineraria Diseases

Name: Cineraria Diseases
SKU: ART-3529

Informational table showing disease name, symptoms, pathogen/cause, and management of Cineraria diseases.

Updated:

June 27, 2025

Cineraria plant in flower; daisy-like flowers with magenta tips

Disease	Symptoms	Pathogen/Cause	Management
Alternaria Leaf Spot	Dark brown to black spots form on leaves. These enlarge to engulf large portions of the leaf. Spots on petioles may allow them to break.	Alternaria senecionis	Remove infected leaves. Water in a manner that keeps leaf surfaces dry. Maintain low humidity. Apply a fungicide to protect healthy plants.
Downy Mildew	Yellow spots on leaves become black. Sparse fungal growth may appear on the underside of infected leaves.	Plasmopara halstedii	Water in a manner that keeps leaf surfaces dry. Remove infected leaves.
Phytophthora Root and Collar Rot	Roots and stems at the soil line rot. Plants wilt and die.	Phytophthora cinnamomi, P. cryptogea, P. megasperma, and P. drechsleri	Plant in pasteurized potting mix. Apply a fungicide to protect healthy plants.
Powdery Mildew	White fungal growth forms on the leaf surface.	Golovinomyces cichoracearum (formerly Erysiphe) or Sphaerotheca fusca	Heat and ventilate to maintain low humidity at night. Apply a fungicide to protect healthy plants.
Viruses	Leaves may be mottled, have yellow spotting, dead flecks, line or ring spot patterns. The plant may be distorted, have flower color breaking, or be stunted. Veins may be killed along with petioles and the entire plant.	Impatiens necrotic spot, streak, and mosaic viruses.	Destroy infected plants. Maintain good thrips and mite control.