Reasons for the devastating decline of this beautiful beetle are unknown (3). Present threats include shading mainly by willows, planted to help to stabilise the riverbank, or the introduced plant Himalayan balsam (Impatiens gludulifera) (3).
English Nature has funded a three-year study of the ecology of this beetle at the University of York. Hopes are that insights into the species resulting from this research will aid its conservation (3).
During construction of improved flood defences in part of the current range, tansy plants and beetles were removed, stored and relocated on the new defences. If this work is successful, English Nature may develop a long-term recovery programme for the species (3).
In 2014, the tansy beetle had a very good year in its stronghold along a 30 km stretch of the River Ouse near York, UK. Of these many thousands of adults a small proportion were taken and reintroduced to Wicken Fen nature reserve in Cambridgeshire, where they had been absent for 32 years (4).
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