Crassula helmsii: Use liquid nitrogen to kill plants
Overall effectiveness category No evidence found (no assessment)
Number of studies: 0
Background information and definitions
Liquid nitrogen (-196 °C) can kill vegetation by freezing, and has the advantage that no harmful residues are left in the environment. It could therefore be used for targeted treatment of localized patches of C. helmsii. However, a small trial suggested that only parts of the plant that came into direct contact with liquid nitrogen were killed (Leach & Dawson 2000, no data given). Dense mats of C. helmsii are therefore likely to insulate all but the top layer of vegetation from the effects of freezing. Specialist training is also required for operators applying liquid nitrogen.
Leach J. & Dawson H. (2000) Is resistance futile? The battle against Crassula helmsii. Journal of Practical Ecology and Conservation, 4, 7-17.