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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 (1500); imazapic (140); isouron (175); s-metolachlor (576 and 960) and check plot. Post-emergence herbicide treatments were: fomesafen (250); [diuron+paraquat] [200+400]; 2,4-D (1005); carfentrazone-ethyl (60); chlorimuron-ethyl (15); lactofen (168); bentazon (720); flumiclorac-pentyl (60); [glyphosate+imazethapyr] [444,5+75]; diquat (400); glyphosate (540 and 1440) and check plot. For pre-emergence applications, all herbicides were considered efficient for A. tenella control, propitiating more than 98% control at 28 days after application (DAA). The post-emergence herbicide treatments, fomesafen, lactofen and bentazon did not control A. tenella. Remaining post-emergence treatments provided more than 97% control of A. tenella at 28 DAA.

Efetividade de herbicidas no controle de Alternanthera tenella