Control of Acacia farnesiana and of Mimosa pteridofita in pastures

An experiment was carried out to study the efficacy of herbicide treatments in controlling two serious pasture weeds: Acacia fornesiana and Mimosa pte ridofita. The following herbicides were applied to the stump, after cutting : diesel oil, used engine lubricant oil, 2,4-D + picloram diluted in water or diesel oil and a control treatment without herbicide. All herbicide trea tments were tested on two sizes of the plants and two heights of cutting, e xcept the lubricant oil. The shrub control and sprouting vigor were evaluat ed in all treatments. The results showed that cutting of plants is effectiv e only when it is carried out at the soil surface level and followed by a s pecific herbicide treatment, such as 2,4-D + picloram. Diesel oil controlle d 100% of the younger plants of both species, at lower costs. There is an a ntagonistic effect between diesel oil and 2,4-D + picloram to control both species. The lubricant oil did not show any herbicide effects on these spec ies.