The control of soft rush Juncus effusus by cutting

摘要

Although a low cover of soft rush Juncus effusus L. in species-rich pastures is often desirable from a nature conservation viewpoint, where the plant is too abundant its control can be problematic. Cutting is the only acceptable treatment where both nature conservation and organic production are primary aims of management. This paper explores the most effective ways of controlling soft rush through cutting, summarising both previous research and presenting new data collected in Devon, England. Cutting reduces the vigour of soft rush tussocks and the effect is increased with multiple cuts. Cutting flush with the ground is more effective than cutting at a height of 8cm or higher. Tussocks can survive at least eleven consecutive cuts at 8cm. After six cuts at this height, whether at fortnightly or monthly intervals, any further reduction in tussock vigour is minimal. If only a single cut is possible, then cutting after midsummer is more effective than before midsummer, but the reverse may be true if several cuts are possible. Cutting at monthly intervals is more effective than at fortnightly intervals. It is concluded that cutting alone is unlikely to reduce the cover of soft rush unless several cuts in a year are possible. In view of this, management should aim to anticipate and prevent any rush build-up. Where wildlife constraints allow, cuts should be as close to the ground as possible, probably start before midsummer, and be at monthly (or possibly longer) intervals. Cut material should preferably be removed. It is suggested that it may be in the long-term interests of problem sites if in some years a rigorous cutting regime is followed.