In crops of Spanish peanuts at Katherine, N.T., trifluralin at 1 lb active ingredient an acre and benefin at 2 lb a.i. an acre gave almost complete control of the two pigweeds Trianthema portulacastrum and Portulaca oleracea. During two seasons, one a dry short season and the other a season of average rainfall and duration, both herbicides were very effective and did not cause any crop damage. Prometryne at 3 lb a.i. an acre and linuron at 2 lb a.i. an acre gave good control in the dry season but only fair control in the wetter season. Chloramben at 4 lb a.i. an acre gave excellent weed control with little crop damage in the normal season, but poor weed control and considerable crop damage in the dry season.