The effect of leaf and umbel removal on regeneration and fecundity of giant hogweed Heracleum mantegazzianum in the Krivoklat Protected Landscape Area, Stredoceský, Czech Republic
This study is summarised as evidence for the following.
Control invasive non-native plants on farmland (such as Himalayan Balsam, Japanese knotweed)Action Link
Control invasive non-native plants on farmland (such as Himalayan Balsam, Japanese knotweed)
A randomized, replicated, controlled study in summer 1993 in a pastureland in the Krivoklat Protected Landscape Area, Czech Republic (Pysek et al. 1995), found that removing all flower heads (umbels) of giant hogweed Heracleum mantegazzianum reduced seed production by 95% in that year. The effect on seed production of removing all flower heads and leaves was not significantly different from removing flower heads alone. Removing only the terminal flower head showed no significant difference in seed production compared to the control. The timing of flower head removal was planned to coincide with the peak flowering period. The study site was divided into eight blocks of four plants, with one plant in each block receiving each of four tissue removal treatments: removal of all flower heads and leaves, removal of all flower heads, removal of the terminal flower head and control.