The tolerance of Acacia species to herbicides.

Herbicides are often required to reduce weed competition when establishing Acacias or are needed to kill them when they become environmental weeds. The work presented provides the dose response curves for herbicides on various species of Acacia seedlings. Flumetsulam, glufosinate, iodosulfuron, imazamox and metosulam were tolerated at 160, 600, 32, 60 and 35.7 g a.i. ha 1 respectively or 3–10 times their normal use rates. Clopyralid and glyphosate were tolerated at the lower end of their normal use rates around 60 and 600 g a.i. ha 1 respectively. Clopyralid provided good control of Acacia seedlings at rates above 500 g a.i. ha 1 and control with glyphosate was variable with rates of 1300–5000 g a.i. ha 1 required for greater than 90% kill.