30/08/2026
Tracy and Sophie (GRT INNS team) have been out surveying the Himalayan balsam trial site on the Annan catchment following a further release of the rust fungus 5 weeks ago. The results look encouraging. Roughly 70% of the plants within the trial site have the rust on them showing that it' is establishing itself nicely. We will continue to monitor the progress of the rust in this area. In time the infected Himalayan balsam plants should show reduced vigour and seed production which will allow native plant species to be able to compete better with the balsam and return. It will take time, but we are hopeful the rust will spread amongst the Himalayan balsam in the Annan catchment providing a sustainable and long-term management of this INNS. We will be closely monitoring the situation to ensure all the balsam populations are susceptible to the specific rust strain we released.
This work is delivered as part of the GRT 'Scottish Solway INNS Control & Knowledge Programme' which is working with communities and stakeholders across most of Dumfries and Galloway. The programme is funded by The National Lottery Heritage Fund Scotland