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Most plant diseases are caused by fungi, bacteria, and viruses. Although the term disease is usually used only for the destruction of live plants, the action of dry rot and the rotting of harvested crops in storage or transport is similar to the rots of growing plants; both are caused by bacteria and fungi.
Clematis wilt This is the most important disease of clematis. Large-flowered varieties vary in their susceptibility whilst small-flowered forms are mostly resistant. Clematis wilt is caused by infection with a fungus which results in the sudden wilting and collapse of the upper parts of the plant. The plant can sometimes be saved by cutting back below the level of infection - even if this means cutting it down to ground level.