Crassula helmsii: Dry out waterbodies to control plants
Overall effectiveness category No evidence found (no assessment)
Number of studies: 0
Background information and definitions
Draining waterbodies is a potential tool for eliminating or reducing invasive aquatic organisms. One pond infested with C. helmsii was reported to have been drained over winter resulting in a reported ‘severely reduced biomass’ of the plant, although no data were provided (Dawson & Warman 1987). The ability of C. helmsii to withstand drying out (Anderson et al. 2015) and regenerate from small fragments of plant material (Dawson & Warman 1987) mean that this approach alone is unlikely to be fully effective. It is also likely to have negative impacts on native species.
Anderson L.G., Dunn A.M., Rosewarne P.J. & Stebbing P.D. (2015) Invaders in hot water: a simple decontamination method to prevent the accidental spread of aquatic invasive non-native species. Biological Invasions, 17, 2287-2297.
Dawson F. H. & Warman E.A. (1987) Crassula helmsii (T. Kirk) Cockayne: Is it an aggressive alien aquatic plant in Britain? Biological Conservation, 42, 247-272.