Informational table showing disease name, symptoms, pathogen/cause, and management of Cineraria diseases.
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 sensecionis
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 stem 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. Plant may be distorted, have flower color breaking, or may 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.
leaf spot
leaf spot
Impatiens necrotic spot virus infection symptoms on leaves and stem.
Prepared by Gary W. Moorman, Professor of Plant Pathology