Clematis Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Clematis diseases.
Clematis Diseases - Articles

Updated: August 8, 2017

Clematis Diseases
DISEASESYMPTOMSPATHOGEN/CAUSEMANAGEMENT
Leaf spotLarge spots form on the leaves, become tan or black in color and may have a zonate pattern within them.Phoma (formerly, Ascochyta), Botrytis, Cercospora, Cylindrosporium, Phyllosticta, and SeptoriaEnsure good air circulation around clematis stems. Remove infected leaves as they are detected. Irrigate plants in a manner that keeps water off the foliage. Apply a fungicide to protect plants.
Clematis wiltPlants with dark brown to black Ascochyta leaf spots develop a stem canker that leads to plant wilting and dieback.Phoma (formerly, Ascochyta) clematidinaSee leaf spot management above. Prune infected stems.
Powdery mildewWhite fungal growth develops on the leaves. Leaves wither and die.ErysipheApply copper sulfate, potassium bicarbonate or sulfur as soon as mildew is observed.
RustsSlightly swollen areas on the vine have eruptions of yellowish spores.Aecidium and Puccinia spp.Ensure good air circulation around clematis stems. Remove infected leaves as they are detected. Irrigate plants in a manner that keeps water off the foliage.
Phymatotrichopsis and Phytophthora root rotsWilting and dying plants have a rot at or slightly below the soil linePhymatotrichopsis or PhytophthoraEnsure good air circulation around clematis stems. Remove infected leaves as they are detected. Irrigate plants in a manner that keeps water off the foliage.
Tomato ringspot virus (ToRSV)Yellow mottling and spotting occurs on leaves.Tomato ringspot virus (ToRSV)This virus is moved from infected clematis and some weeds by nematodes. If plants are vegetatively propagated from infected stock plants, new plants will have the virus. Remove infected plants