Clematis wilt is a disease of clematis caused by the fungus Calophoma clematidina (syn Phoma clematidina, Ascochyta clematidina). Rose Rosette. Treatments are available to slow the growth of a crown gall and to minimize its damage, but these efforts will not kill this infection. Here is what to do to try to prevent it from happening to your clematis. Once the disease hits, there is no chemical treatment to stop it, but it rarely kills the plant. Wilt will also occur with very small infants soon after they are placed in their permanent spot in the garden. Remove infected leaves as they are detected. It makes clematis vines shrivel and may cause death of the plant. It is very quick to take hold, and a seemingly healthy plant one day, can turn into a drooping specimen the next - thereafter with the foliage dying off and a quick descent into death! It is a stem rot/leaf spot disease caused by the fungus, Ascochyta clematidina, which mainly affects large-flowered clematis hybrids.Species clematis, their cultivars, and small-flowered hybrids are much less susceptible. Control. Apply a fungicide to protect plants. Large-flowered hybrid cultivars are prone to clematis wilt whereas the species with smaller flowers such as clematis alpine or clematis viticella for instance seem to be much more resistant. Treatment only slows the progress of the disease and is not recommended. Clematis wilt is a common problem when growing clematis, especially with the fancier hybrids which have less resistance. Provided that the upper sections are green, this is not clematis wilt. If those are the symptoms then the plant does indeed have clematis wilt. Clematis wilt is a condition that seems to affect the large flowered, spring blooming clematis more than other varieties. Irrigate plants in a manner that keeps water off the foliage. Plants with clematis wilt disease will suddenly completely collapse overnight - the foliage turns black (not brown) and the veins take on a purple colour. In my opinion, this is the saddest-looking disease a plant could possibly develop. It is characterized by a complete collapse of either the entire plant, just one of the shoots, or just part of a shoot. The most serious disease of clematis, a varied genus consisting of about 250 species, is commonly called clematis wilt. True Clematis Wilt is a fungal disease (Phoma Clematidina) which can find its way into the plant - after stem damage by other causes. Clematis wilt: Plants with dark brown to black Ascochyta leaf spots develop a stem canker that … Ensure good air circulation around clematis stems. Clematis tend to lose their lower leaves later in the season and they usually go brown or black before falling off. Clematis wilt (sometimes it can be called clematis leaf and stem spot) is a devastating fungal disease. Know the signs. 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