The Clematis genus contains a large group of vines that bloom in a range of flower colors. The deciduous or evergreen vines come in all sizes. Clematis disorders are identified by certain outstanding symptoms, such as the wilting of foliage and flowers.
Wilting clematis is the result of a serious fungal disease caused by Phoma clematidina. Clematis vines with large flowers are more susceptible to the disease than the small-flower varieties. The fungus infects plants through the stems, roots, nodes or leaf joints.
Once the fungus enters the plant, it spreads rapidly and interferes with the functioning of the vascular tissues that distribute nutrients and water through the plant. The lack of water causes all parts of the plant, including blossoms to start wilting. Often the entire plant collapses with no other prior symptoms.
Prune all affected plant areas severely. Do not leave pruned debris around healthy plants, as the fungus persists in dead plant material and is likely to be spread by insects and water. Disinfect all pruning tools to avoid spreading fungus. There are no recommended chemicals for clematis wilt control.