A espécie Cyperus rotundus está entre as plantas daninhas mais difíceis de controlar, podendo causar elevados prejuízos na cultura da cana-de-açúcar. As práticas adotadas garantem os valores de produtividade, dentre elas, está o manejo de plantas daninhas. O objetivo deste trabalho foi avaliar o crescimento inicial de mudas pré-brotadas de cana-de-açúcar submetidas à aplicação de herbicidas em pré ou pós-plantio. Foram conduzidos dois experimentos (pré e pós-plantio) em casa-de-vegetação, em delineamento inteiramente casualizado, com quatro repetições. Os tratamentos correspondem aos herbicidas aplicados em três doses em pré-plantio: sulfentrazone (400, 800 e 1.600 g i.a. ha-1), diclosulam (96,6; 193,17 e 386,34 g i.a. ha-1), imazapic (66,5, 133 e 266 g i.a. ha-1) e imazapyr (250, 500 e 1.000 g e.a. ha-1) e pós-plantio: ethoxysulfuron (67,5, 135 e 270 g i.a. ha-1), halosulfuron (56,25, 112,5 e 225 g i.a. ha-1), 2,4-D (670, 1.340 e 2.680 g e.a. ha-1) e MSMA (987,5, 1975 e 3.950 g i.a. ha-1). Além de duas testemunhas sem aplicação de herbicidas. Foram avaliados os sintomas de injúrias, altura, diâmetro, número de folhas, número de perfilhos, teor de clorofila, área foliar, matéria seca da parte aérea e raiz. Os herbicidas em pós-plantio foram considerados seletivos, uma vez que os sintomas de injúrias foram baixos e os outros parâmetros avaliados não foram diferentes da testemunha. Para as aplicações em pré-plantio foram observados sintomas de injúrias até os 60 dias após a aplicação (DAA) para sulfentrazone.
Chemical management is the most widely adopted technique to control weeds in sugarcane crops. Purple nutsedge (Cyperus rotundus L.) is among the most difficult species to control. Herbicides need to be absorbed and translocated in a sufficient amount for the tuber chain to be effective. Thus, this study aimed to evaluate the effectiveness of the herbicides sulfentrazone, diclosulam, imazapic, imazapyr, halosulfuron, ethoxysulfuron, monosodium methyl arsenate (MSMA), and 2,4-dichlorophenoxyacetic acid (2,4-D) in controlling C. rotundus and reducing the viability of its tubers. The experiment was carried out in a greenhouse in a completely randomized design, with nine treatments and four replications. The herbicides sulfentrazone (800 g active ingredient – ai·ha?1), diclosulam (193.17 g ai·ha?1), imazapic (133 g ai·ha?1), and imazapyr (500 g acid equivalent – ae·ha?1) were applied in preemergence at five days after planting the tubers, while halosulfuron (112.5 g ai·ha?1), ethoxysulfuron (135 g ai·ha?1), MSMA (1,975 g ai·ha?1), and 2,4-D (1,340 g ae·ha?1) were applied in postemergence (4 to 5 leaves). The parameters visual control, shoot dry matter, number of tubers and bulbs, weight of tubers + bulbs, number of epigeal manifestations, and tuber viability were analyzed. The herbicides diclosulam, halosulfuron, and ethoxysulfuron provided 100% control of the shoot at 90 days after application (DAA). All herbicides reduced the number of bulbs, weight of tubers + bulbs, and shoot dry matter. The herbicides sulfentrazone, imazapic, halosulfuron, ethoxysulfuron, and MSMA provided the highest reduction in tuber viability.
Resumo -É essencial a rotação de mecanismos de ação de herbicidas no manejo de plantas daninhas resistentes ao glyphosate, neste contexto o uso de herbicidas inibidores da enzima ALS em associação pode auxiliar no controle. O objetivo do trabalho foi avaliar a eficácia de sulfometuron, chlorimuron e outras sulfonilureias, isolados ou em associação com glyphosate, no controle de amendoim-bravo, corda-de-viola e picão-preto. Foram realizados três experimentos em casa-de-vegetação, em delineamento inteiramente casualizado, com quatro repetições. Os tratamentos corresponderam aos herbicidas aplicados em pós-emergência das plantas daninhas mais a testemunha (sem aplicação), quando estas estavam com duas folhas completamente desenvolvidas. Os resultados evidenciaram que sulfometuron (15 g ha -1 i.a.) + chlorimuron (20 g ha -1 i.a.) + glyphosate (960 g ha -1 e.a.), foi eficaz no controle de amendoim-bravo, e o tratamento halosulfuron (80 g ha -1 i.a.) + glyphosate (960 g ha -1 e.a.) propiciou controle de 76,25%. A aplicação de sulfometuron (15 g ha -1 i.a.) + chlorimuron (20 g ha -1 i.a.) + glyphosate (960 g ha -1 e.a.), foi eficaz no controle de corda-de-viola. Todos os tratamentos herbicidas foram eficazes no controle em pós-emergência de picão-preto. Palavras-chave: sulfonilureias, manejo químico, associação de herbicidas, Euphorbia heterophylla, Ipomoea purpurea, Bidens subalternans Abstract -It is essential the rotation of mechanisms of action in the management of glyphosate resistant weeds, in this context the use of ALS inhibitor herbicides in association can aid in the control. The aim of this work was to evaluate the efficacy of sulfometuron, chlorimuron and other sulfonylureas, isolated and in associations in the control of Wild Poinsettia, Morning Glory and Greater Beggarticks. Three greenhouse experiments were carried out in a completely randomized design with four replications. The treatments corresponded to the herbicides applied in post-emergence of the weed plus the control (without application), when these were with two completely developed leaves. The results showed that sulfometuron (15 g ha -1 a.i.) + chlorimuron (20 g ha -1 a.i.) + glyphosate (960 g ha -1 a.e.) was effective in the control of Wild Poinsettia, and halosulfuron treatment (80 g ha -1 a.i.) + glyphosate (960 g ha -1 a.e.) provided a control of 76.25%. The application of sulfometuron (15 g ha -1 a.i.) + chlorimuron (20 g ha -1 a.i.) + glyphosate (960 g ha -1 a.e.) was effective in the control of Morning Glory. All herbicides treatments were effective in the post-emergence control of Greater Beggarticks.
Weeds compete with plants for water, light, nutrients and space. In sugarcane, planting pre-sprouted sugarcane seedlings (PSS) may mean a change in weed interference and management. The aim of this study was to generate information on the interference of Cyperus rotundus L. in PSS. Two experiments were carried out in a completely randomized design, one with cultivar RB985476, with seven densities of C. rotundus (0, 17, 35, 70, 140, 280 and 560 plants m-2), and the second with cultivar IACSP95-5000, with four densities of C. rotundus (0, 70, 140 and 280 plants m-2). For this weed, a 2x6 factorial design was used for the experiment with RB985476 and a 2x3 design was used for IACSP95-5000, the first factor being absence and presence of the crop, and the second factor the densities of the species. Biometric evaluations of height, diameter, number of tillers and leaves, leaf area and dry mass were carried out. The PSS had a reduction in height, number of leaves and leaf area in the main till at 60 d after planting (DAP) in RB985476. For the IACSP95-5000 cultivar, there was no reduction in the analyzed variables. The average dry mass per plant of C. rotundus decreased as the density of the species increased in the absence of PSS.
Seletividade de herbicidas em mudas de nogueira-macadâmia (Macadamia integrifolia) / Felipe Carrara de Brito --versão revisada de acordo com a resolução CoPGr 6018 de 2011. --Piracicaba, 2021. 36 p. Dissertação (Mestrado) --USP / Escola Superior de Agricultura "Luiz de Queiroz". 1. Controle químico 2. Macadâmia 3. Plantas daninhas I. Título Em memória ao meu avô Eugênio em quem tanto me espelho e que nos deixa com grande saudade, dedico.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
334 Leonard St
Brooklyn, NY 11211
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.