PROGRESS AT HOLTSPUR BOTTOM RESERVE by Nick Bowles
Autumn 2000 saw us undertaking a truly major project, our most
ambitious, with some trepidation. After a very successful appeal for money to improve the
reserve we summoned up all our courage and decided to spend it tackling the sites
ragwort infestation (see the article about the sites ragwort forest in Butterfly
Conservation News no 74 Spring/Summer 2000 p13, or our own Butterfly Conservation in the
Chilterns, May 2001 p29) with a make or break re-seeding. After considerable
effort over several years, we halted the relentless advance of the plant but had not
reduced its density in the area already afflicted when the reserve was taken on.
You will know that ragwort can be a beneficial plant for a range of invertebrates (e.g. it
is a nectar source and foodplant of the attractive Cinnabar day flying moth) so we never
want to remove it completely. Sadly, it is poisonous to grazing stock and seeds from our
land blow in the wind to our neighbours land. Our funding partner insisted we reduce the
amount of ragwort
The only thing that all experts in land management seemed to agree was that it was going to be extremely hard to improve a situation that was so bad. There were nearly as many opinions about the next step as individuals to be asked. Hours of discussion went into our eventual decision and we knew we had explored all the avenues open to us. Logic suggested that only drastic measures would result in a rapid change, experience suggested that it could go badly wrong. Our anxiety cannot be overstressed.
So as you may already have heard we spent heavily to buy the best seed we could get (at a substantial discount, thank you Marek); arranged to have the land ploughed so deeply that the topsoil was buried under the less fertile subsoil and then we rolled the lumpy clods and re-seeded. Finally, we sat back in a state of nervous tension. Would the seed germinate (it had been planted later than is ideal, in the wettest autumn for decades)? Had the ragwort seeds been buried sufficiently deeply to stop germination? Moreover, had we acted wisely with your money?
Through the winter the land lay fallow and rather bleak, under a sheen of tiny green grass shoots. No sign of ragwort re-appearing but any optimism was kept in check as we knew that it would not germinate until the spring. Through that winter conversation only turned to the topic warily and we all wanted someone else to be the one to check it out so that we were spared the devastation of being the first to discover that so much work had come to nothing.
Meanwhile all the other tasks of reserve management continued. Winter work parties removed dogwood scrub from the floristically rich Triangle Bank, planted hedges and generally tidied up the reserve ready for another season. Some of these tasks were undertaken with help from the Braywick Watch group and it was heartening to have lively youngsters enthusiastically working alongside us. Photographic and written records were made, so that it will be possible to look back and judge the outcome of these actions. Then Foot and Mouth restrictions made access nearly impossible and for several months no one visited.
One day in late May, Frank Banyard and Nick Bowles approached the reseeded Lower Field cautiously at first but with an increasing sense of delight. A rippling carpet of downiand grasses swayed in a soft wind and the first flowers of buttercup, poppy and birds foot trefoil were sparkling. Ragwort wasnt completely eliminated, it was very prevalent along the fence lines where ploughing had been impossible but compared with previous years, this was amazing. 5 sessions of ragwort pulling ensued and we are extremely grateful to those selfless few that devoted a good deal of effort to the task; especially Mike and Wendy who were extremely effective and showed outstanding stamina. They were rewarded with the best sightings of Dark Green Fritillaries that have been reported this season.
In the summer the notice board was renovated and the displays refreshed. The open day came and the reserve managers were able to feel justly proud of the effects of their intervention. The site looked wonderful and despite poor weather on the day butterflies were evident in all three sections of the reserve. The remaining tufts of ragwort along the fence lines showed how far we had come, while the knapweed, scabious and varied grasses of the Lower Field showed the way we were headed.
At a late August visit to decide what needs to be done this autumn and winter, the lower field had been cut, and a host of seedling herbs were growing amongst the grasses. The boundaries too were clear; it was not hard to find ragwort here, but it is under control. It looked great.