Astilbe Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Astilbe diseases.
Astilbe Diseases - Articles
Astilbe Diseases
DiseaseSymptomsPathogen/CauseManagement
Flower failurePlants do not flower but otherwise appear healthy.Not a diseaseDivide and replant to alleviate overcrowding.
Foliar nematodeBrown areas on the leaf are restricted in shape by leaf veins. These angular spots are usually seen on the lower leaves.AphelenchoidesRemove the leaves showing symptoms. Thin dense clumps to improve air circulation and irrigate in a manner that keeps water off the foliage.
Leaf scorchMargins of leaves turn red to reddish-brown.High temperatures, dry soil, windy conditions.Move the plants to a shady, moist location. Note that leafhopper feeding can also cause leaf tips to redden and brown.
Leaf spotWell defined dead spots form on leaves. Under ideal conditions of wet weather, spots merge and result in large dead areas on the leaf.CercosporaWhen watering plants, do so in a manner that keeps water off the foliage. Apply a fungicide to protect plants.
Powdery mildewWhite fungal growth develops on the upper surface of leaves.Erysiphe polygoniApply a fungicide to protect plants.
Root knot nematodeGalls form on roots and plants may be stunted.MeloidogyneRemove infected plants. Cultivate the area to remove all plants and leave the soil bare for a growing season before replanting.
VirusPlants are yellowed but roots appear healthy.Tobacco ringspot virusRemove infected plants.
WiltPlants are stunted or wilted and have brown sunken dead areas on the stem near the soil line.Rhizoctonia or FusariumRemove affected plants.

Authors

Gary W. Moorman, Ph.D.