The objective of this work was to evaluate the efficacy of different herbicides, applied both at pre and post-emergence, to control Alternanthera tenella. Two assays were accomplished: the first one for pre-emergence herbicides, and the second one for post-emergence herbicides, applied at two pair of leaves stage. Pre-emergence herbicide treatments and respective rates (g i.a. ha-1) were: alachlor (2880); chlorimuron-ethyl (15); metribuzin (576); clomazone (1000); flumetsulam (120); sulfentrazone (600); trifluralin (540); amicarbazone (1050); pendimethalin (1500); oxyfluorfen (360); ametryn (1500); diuron […]

The weed Chloris distichophylla (Lag) has been selected in areas of orchards and RR soybean in the Rio Grande do Sul- RS (Brazil), resulting of its possible tolerance to the herbicide glyphosate. This selection occurs due to intense use of this herbicide in the last years resulting in a disturb caused by the high pressure selection imposed by the herbicide occurs, resulting in selection of tolerant plants. The objective of this study was to evaluate the effectiveness of herbicides pertaining […]

Two experiments were conducted to evaluate the influence from the addition of pH reducers and rates of glyphosate in the spray mix to Euphorbia heterophylla and Glycine max control. The treatments were arranged in a factorial scheme (4 x 2) + 1, randomized blocks design and four replications. Each experiment used a pH reducer (pH Fós ou Redumax), four rates of reducer (0, 50, 75 and 100% of the rate recommended), two rates of glyphosate (450 and 900 g ha-1) […]