Gaillardia Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Gaillardia diseases.
Gaillardia Diseases - Articles
Gaillardia Diseases
DiseaseSymptomsPathogens/CauseManagement
Aster yellowsLeaves are yellowed and flowers do not appear normal or of good quality.Phytoplasma (bacterial-like organism)Remove and destroy infected plants. Control leafhoppers early in the season with insecticides in order to suppress spread of the pathogen from weeks to your plants.
Bacterial leaf spotAreas between veins turn dark brown and collapse. The entire plant may be killedPseudomonasRemove and destroy infected plants. Do not use sprinkler irrigation.
White smutAt first light green spots, some with tan centers, form on the leaves and white spores form on the spots. The leaf spots become dark brown.Entyloma spp.Remove and destroy spotted leaves. Apply a fungicide to protect plants.
Septoria leaf spotTan spots containing tiny dark brown to black dot-like fungal fruiting structures form on the leaves.SeptoriaDo not use sprinkler irrigation.
Powdery mildewWhite fungal growth develops on the surface of leaves.Golovinomyces and SphaerothecaApply a fungicide to protect plants.
Root and stem rotsLower stems turn tan to dark brown. Sometimes white webs of fungal growth can be seen.Pythium, Sclerotinia, Thielaviopsis, RhizoctoniaAvoid overwatering and do not mound mulch against the plant.
VirusesLeaves may be distorted or have patches of light and dark green colorationImpatiens necrotic spot, tomato spotted wilt, or and cucumber mosaic virusRemove and destroy infected plants. Control thrips (vector of impatiens necrotic spot and tomato spotted wilt) and aphids (vectors of cucumber mosaic).


Smut


Septoria leaf spot

Prepared by Gary W. Moorman, Professor of Plant Pathology