Changes in fallow weed composition following the use of herbicides in Mareeba-Dimbulah tobacco area of Northern Queensland

Abstract

Experiments were conducted on fallow tobacco ground in North Queensland to observe changes in volunteer fallow weed communities following the use of the chemicals pebulate, trifluralin, and benefin for weed control. Trifluralin and benefin repressed grasses and most broad-leaved weeds, resulting in almost complete pre-dominance of star burr (Acanthospermum hispidum), which is a noxious weed in Queensland. Pebulate showed good control of this weed and permitted a fallow dominated by green summer grass (Prachiaria miliiformis).