CONTROLE QUÍMICO DE MILHO RESISTENTE AO GLYPHOSATE PROVENIENTE DE DIFERENTES HÍBRIDOS
DOI:
https://doi.org/10.18512/1980-6477/rbms.v17n3p535-547Keywords:
herbicidas, Zea mays.Abstract
RESUMO – As plantas voluntárias de milho podem causar perdas quando em convivência com outras culturas, tornando-se necessário proceder seu controle. Neste sentido, diferentes estratégias podem ser utilizadas, destacando-se o manejo químico. O objetivo desse trabalho foi avaliar a suscetibilidade de híbridos de milho RR® ao controle químico com aplicação de herbicidas em pós-emergência. O experimento foi conduzido em campo, utilizando-se o delineamento de blocos casualizados, em esquema de parcelas subdivididas, com quatro repetições. Na parcela principal foram avaliados oito tratamentos compostos pela aplicação de clethodim + glyphosate, quizalofop-p-ethyl + glyphosate, clodinafop + glyphosate, imazethapyr + glyphosate, [imazamox + bentazon] + glyphosate, cloransulan + glyphosate, glyphosate e testemunha sem aplicação. Nas subparcelas foram semeados nove híbridos de milho RR®. Tratamentos contendo [imazamox + bentazon] ou cloransulan não foram eficientes no controle de plantas de milho RR® em estádio V6. O imazethapyr associado ao glyphosate foi eficiente no controle de plantas de milho dos híbridos DKB390, SYN7025 e CD384, os quais mostram maior suscetibilidade a esse herbicida em comparação aos demais híbridos. Plantas provenientes de todos os híbridos avaliados, no estádio V6, podem ser totalmente controladas com a aplicação dos herbicidas quizalofop-p-ethyl, clodinafop e clethodim, contudo, clethodim apresentou ação mais lenta.
Palavras-chave: herbicidas, plantas voluntárias, pós-emergência, Zea mays.
CHEMICAL CONTROL IN DIFFERENT GLYPHOSATE RESISTANT MAIZE HYBRIDS
ABSTRACT – Volunteer corn plants can cause high losses when in coexistence with other crops, making necessary its control. In this sense, different strategies can be used, emphasizing the chemical management. The objective of this work was to evaluate the susceptibility of RR® corn hybrids to chemical control with post-emergence herbicides. The experiment was carried out at field, using a randomized complete block design in a split plots scheme, with four replications. In the main plot, eight treatments were evaluated using clethodim + glyphosate, quizalofop-p-ethyl + glyphosate, clodinafop + glyphosate, imazethapyr + glyphosate, [imazamox + bentazon] + glyphosate, cloransulan + glyphosate, glyphosate, and a control without herbicide application. In the subplots, nine RR® corn hybrids were sown. Treatments with [imazamox + bentazon] and cloransulan were not efficient in the control of RR® corn plants at V6 stage. The imazethapyr treatment associated to glyphosate was efficient in controlling the corn hybrids DKB390, SYN7025, and CD384, which showed greater susceptibility to this herbicide compared to the other hybrids evaluated. Plants of all evaluated hybrids can be controlled at V6 with the application of quizalofop-p-ethyl, clodinafop, and clethodim, however, clethodim presented slower action.
Keywords: herbicides, volunteer plants, post-emergence, Zea mays.
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