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IntroductionSolanum dulcamara is a common European weed called woody nightshade, bittersweet or douce amère. It grows in hedgerows, gardens and wasteland throughout Europe and spreads via underground stems.It has been used in folk medicine across Europe for hundreds of years. But Michel Felix Dunal, who worked on Solanum in the 1800s, realised that many of the powers attributed to this plant were spurious.Woody nightshade was used to treat skin conditions, circulatory conditions and breathing problems like asthma. It was included in the official British Pharamcopeia until 1907, but was taken out of later editions.It carries the bacterium - Ralstonia solanacearum – that causes brown rot in potatoes. The disease can be spread to potatoes from infected woody nightshade growing on riverbanks if the river water is used to irrigate potato fields.