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The aim of this work was to evaluate the selectivity and the efficacy of ac1onifen, isolated or in mixture with other herbicides, in postemergence weed control in a sunflower crop. The experiment was conducted in 1998/99, at the Experimental Farm ofMaringa State University, Parana State, using the hybrid Morgan 742. The experimental design was randomized block with nine treatrnents and four replications. The evaluated treatments were: control (with and without hoeing), aclonifen (780 and 900 g/ha), quizalofop-p-ethy (75 g/ha), aclonifen +quizalofop-p-ethy (900 +75 and 900 + 100 g/ha), aclonifen +fomesafen (900 +25 g/ha) and aclonifen +chlorimuron-ethyl (900 + 2.5 g/ha). The treatments were applied when the sunflower plants were in V6 to V8, using a carbon dioxide-pressurized backpack sprayer, with a spray volume of 200 Llha. The mixtures of aclonifen + quizalofop-p-ethyl and the quizalofop-p-ethyl alone were seletive for sunflower and efficient in Cenchrus echinatus control, not differing significantly for the control. Ac1onifen.alone or in mixture with fomesafen, chlorimuron-ethyl and quizalofop-pethyl were efficient in the control of Commelina benghalensis and Portulaca oleracea not showing differences between these treatments and the control. Aclonifen alone or in mixture with fomesafen and chlorimuron-ethyl did not cause visual injury to the sunflower crop. The presence of weeds, especially C. echinatus, hindered the harvest and decreased the sunflower yield up to 50.0%.

Controle de plantas daninhas na cultura do girassol com aclonifen aplicado isolado ou em mistura