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Astilbe Diseases

Name: Astilbe Diseases
SKU: ART-3394

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

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Updated:

November 21, 2023

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Disease	Symptoms	Pathogen/Cause	Management
Flower failure	Plants do not flower but otherwise appear healthy.	Not a disease	Divide and replant to alleviate overcrowding.
Foliar nematode	Brown areas on the leaf are restricted in shape by leaf veins. These angular spots are usually seen on the lower leaves.	Aphelenchoides	Remove the leaves showing symptoms. Thin dense clumps to improve air circulation and irrigate in a manner that keeps water off the foliage.
Leaf scorch	The margins of the 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 spot	Well-defined dead spots form on leaves. Under ideal conditions of wet weather, spots merge and result in large dead areas on the leaf.	Cercospora	When watering plants, do so in a manner that keeps water off the foliage. Apply a fungicide to protect plants.
Powdery mildew	White fungal growth develops on the upper surface of leaves.	Erysiphe polygoni	Apply a fungicide to protect plants.
Root-knot nematode	Galls form on roots and plants may be stunted.	Meloidogyne	Remove infected plants. Cultivate the area to remove all plants and leave the soil bare for a growing season before replanting.
Virus	Plants are yellowed but roots appear healthy.	Tobacco ringspot virus	Remove infected plants.
Wilt	Plants are stunted or wilted and have brown sunken dead areas on the stem near the soil line.	Rhizoctonia or Fusarium	Remove affected plants.