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! 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. Know the signs. Treatment only slows the progress of the disease and is not recommended. Treatments are available to slow the growth of a crown gall and to minimize its damage, but these efforts will not kill this infection. Provided that the upper sections are green, this is not clematis wilt. The most serious disease of clematis, a varied genus consisting of about 250 species, is commonly called clematis wilt. Here is what to do to try to prevent it from happening to your clematis. Ensure good air circulation around clematis stems. 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. Wilt will also occur with very small infants soon after they are placed in their permanent spot in the garden. Clematis wilt (sometimes it can be called clematis leaf and stem spot) is a devastating fungal disease. Rose Rosette. Apply a fungicide to protect plants. Clematis wilt: Plants with dark brown to black Ascochyta leaf spots develop a stem canker that … In my opinion, this is the saddest-looking disease a plant could possibly develop. Once the disease hits, there is no chemical treatment to stop it, but it rarely kills the plant. If those are the symptoms then the plant does indeed have clematis wilt. Control. Clematis tend to lose their lower leaves later in the season and they usually go brown or black before falling off. Clematis wilt is a disease of clematis caused by the fungus Calophoma clematidina (syn Phoma clematidina, Ascochyta clematidina). Remove infected leaves as they are detected. 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. It makes clematis vines shrivel and may cause death of the plant. It is characterized by a complete collapse of either the entire plant, just one of the shoots, or just part of a shoot. 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 is a condition that seems to affect the large flowered, spring blooming clematis more than other varieties. Clematis wilt is a common problem when growing clematis, especially with the fancier hybrids which have less resistance. 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