Goldenrod (Solidago) Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Goldenrod (Solidago) diseases.
Goldenrod (Solidago) Diseases - Articles
Goldenrod (Solidago) Diseases
DiseaseSymptomsPathogen/CauseManagement
RustSmall, bright orange, yellow, or brown pustules on the underside of leaves.Coleosporium, Puccinia or UromycesProvide good air circulation. Clean up all debris. Avoid overhead watering. Golden Fleece and Fireworks are reported to be resistant to rust and powdery mildew. Apply a fungicide to protect plants.
Powdery mildewThe powdery white or gray fungus is most evident on the upper surface of leaves. Leaves will often turn yellow or brown, curl up, and drop off; new foliage emerges crinkled and distorted. Use the same methods that are described for the control rusts above.Golovinomyces, Erysiphe, Uncinula, Phyllactinia, SphaerothecaProvide good air circulation and avoid overhead watering. Golden Fleece and Fireworks are reported to be resistant to powdery mildew and rust. Apply a fungicide to protect plants.
Fungal leaf spotsSmall, dark spots of fungal infection tend to appear first on lower leaves. Leaves with numerous spots may turn yellow, then brown, and wither.Ascochyta, Asteroma, Cercospora, Colletotrichum, Macrophoma, Phyllosticta, Placosphaeria, Ramularia, Septoria.Avoid overhead watering, space plants adequately to insure rapid drying, and water early in the day. Apply a fungicide to protect plants.
Bacterial leaf spotDark brown to black spots form on the leaves.Xanthomonas sp.Avoid overhead watering, space plants adequately to insure rapid drying, and water early in the day.
Aster yellowsPlants become yellowed and flowers lack their usual coloration. Tight clusters of leaves may form.PhytoplasmaRemove and destroy infected plants. Apply insecticides to suppress leafhoppers that spread the pathogen.
Crown gallGalls or swollen areas form at the soil line or sometimes higher where the plant had been wounded.Agrobacterium tumefaciensStart with healthy plants that are free of any galls. Remove and destroy infected plants.
Lesion nematodesRoots may be stubby with darkened areas along their length.Pratylenchus pratensisRemove and destroy infected plants. Replant with non-host species.
VirusYellow or brown rings form on leaves or leaves may be yellowed in a mottled pattern. Plants may be stunted.Tomato spotted wilt virus (TSWV)Infected plants should be removed and destroyed. Use insecticides to suppress the insect that spreads the virus, western flower thrips.

Prepared by Gary W. Moorman, Professor of Plant Pathology

Authors

Gary W. Moorman, Ph.D.