Figure 2. Invasion trajectories of Lantana in Australia, India and South Africa.

(a) Historical records of Lantana spread, control and management are scored on a scale of 1–7: (1) first introduced; (2) present, but not a problem; (3) considered weed, invasive or noxious plant; (4) management intensified; (5) management reported effective in some areas; (6) continuation of same management strategy; (7) Lantana seen to be spreading in spite of management. (b) Rate of change is calculated as increase per year in the state of invasion, measured on the seven-point scale.