Attempts to control aquatic Crassula helmsii at Huis ter Heide (Tilburg, The Netherlands), with special reference to dye treatment ; Pogingen tot bestrijding van Crassula hemsii in Huis ter Heide (Tilburg, Nederland)

Several methods were deployed simultaneously to control, if not eradicate, the highly invasive Crassula helmsii (Australian swamp stonecrop, New Zealand pigmy weed) in a newly created shallow pond adjoining the heath and moorland pools of the Dutch nature reserve Huis ter Heide. Measures included mechanical removal of top soil after draining, followed by extensive covering of pond margins with non-transparent foil, regular manual removal of washed-up plants, and addition of non-toxic dyes. The latter aimed to reduce compensation depth sufficiently to prevent submerged growth below the foil-cov... Mehr ...