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Adult females lay their eggs in the straight stems of young purple willows (Salix purpurea). After hatching, the larvae overwinter, and only begin to feed in the following summer. They then live inside the stems, where they take three or four years to develop, and are thought to be inactive from September to April (3). More than one egg is often laid in a single stem, and just 20% of the eggs laid go on to become adults (2).


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Source: ARKive

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