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RESUMO - A mistura entre herbicidas pode resultar em efeitos sinergicos, antagonicos ou aditivos no controle do milho voluntario e de outras especies de plantas daninhas. Objetivou-se com este trabalho avaliar a eficiencia de diferentes doses do fluazifop-p-butil isolado e na associacao com os herbicidas glyphosate, 2,4-D e a mistura glyphosate + 2,4-D. O experimento foi conduzido em vasos contendo cinco litros de solo, com seis doses do herbicida fluazifopp- butil aplicadas em mistura com tres herbicidas/mistura [glyphosate, 2,4-D e glyphosate + 2,4-D] em tres formas de aplicacao (mistura em tanque, aplicados separadamente no mesmo dia e separadamente cinco dias antes da aplicacao do fluazipop-p-butil), mais as seis doses do fluazifop-p-butil sem mistura. Verificou-se que o herbicida fluazifop-pbutil aplicado isoladamente controla de modo eficiente plantas voluntarias de hibrido de milho AS 1660 PRO RR nas doses 75 g ha-1, 28 dias apos a aplicacao (DAA). Porem, a mistura em tanque do fluazifop-p-butil com 2,4-D resultou em reducao do nivel de controle do milho voluntario. Nao houve reducao da eficacia no controle do milho quando se aplicou o herbicida fluazifop-p-butil associado ao glyphosate, 2,4-D e a mistura glyphosate + 2,4-D, separadamente no mesmo dia ou cinco dias apos. Palavras-chave : antagonismo, fluazifop-p-butil, glyphosate, 2,4-D, Zea mays. INTERACTIONS AMONG HERBICIDES IN THE MANAGEMENT OF THE VOLUNTARY MAIZE RR ® ABSTRACT - Mixing herbicides may result in synergistic, antagonistic or additive effects on the control of volunteer maize and other weed species. The objective of this work was to evaluate the efficiency of different doses of fluazifopp- butyl alone and in association with the herbicides glyphosate, 2,4-D and glyphosate + 2,4-D mixture. The experiment was carried out in pots containing five liters of soil, with six doses of the herbicide fluazifop-p-butyl applied in a mixture of three herbicides/mixture [glyphosate, 2,4-D and glyphosate + 2,4-D] (tank mix, applied separately on the same day and separately five days prior to the application of fluazipop-p-butyl) plus the six doses of fluazifop-p-butyl without mixing. The isolated fluazifop-p-butyl herbicide was monitored efficiently to control volunteer maize hybrids AS 1660 PRO RR at doses 75 g ha-1, 28 days after application (DAA). However, tank mixing of fluazifop-p-butyl with 2,4-D resulted in a reduction in the level of voluntary maize control. There was no reduction in efficacy in maize control when applied we the herbicide fluazifop-p-butyl associated with glyphosate, 2,4-D and glyphosate + 2,4-D mixture, separately on the same day or five days later. Keywords : antagonism, fluazifop-p-butyl, glyphosate, 2,4-D, Zea mays.

INTERAÇÕES ENTRE HERBICIDAS NO MANEJO DO MILHO RR® VOLUNTÁRIO