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Clematis Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Clematis diseases.
DISEASE SYMPTOMS PATHOGEN/CAUSE MANAGEMENT
Leaf spot Large 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 Septoria 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. Apply a fungicide to protect plants.
Clematis wilt Plants with dark brown to black Ascochyta leaf spots develop a stem canker that leads to plant wilting and dieback. Phoma (formerly, Ascochyta) clematidina See leaf spot management above. Prune infected stems.
Powdery mildew White fungal growth develops on the leaves. Leaves wither and die. Erysiphe Apply copper sulfate, potassium bicarbonate or sulfur as soon as mildew is observed.
Rusts Slightly 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 rots Wilting and dying plants have a rot at or slightly below the soil line Phymatotrichopsis or Phytophthora 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.
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

 

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Clematis Diseases

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