Seletividade de herbicidas aplicados nas gramas Santo Agostinho e Esmeralda

Costa, Nivan B. da; Martins, D.; Rodrigues, Andréia Marize; Cardoso, L.A.

doi:10.1590/s0100-83582010000100017

Cited by 7 publications

(11 citation statements)

References 15 publications

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“…Conversely, Costa et al (2010) observed a dry matter increase of emerald Zoysia at 49 DAA of metsulfuron-methyl (2.4 g ha -1 ) compared to the control (without application).…”

Section: Resultsmentioning

confidence: 74%

“…Thus, these herbicides demonstrated potential to reduce the leaf dry matter production of lawn grasses, as also reported by Leite et al (2010), who found that glyphosate (216 g ha -1 a.i.) caused an 18.7% reduction of bahiagrass dry matter compared to the control at 71 DAA, by Costa et al (2010), who applied the herbicide metsulfuron-methyl (2.4 g ha -1 ) to Saint Augustine grass and recorded a reduction in plant dry matter of approximately 70% compared to the control at 49 DAA, and by , who observed a reduction in Brachiaria decumbens dry matter of approximately 49.2% after imazaquin application (150 g ha -1 ) at 45 DAA. Notably, none of the cited studies evaluated the application of those herbicides in combination with nitrogen fertilization.…”

Section: Resultsmentioning

confidence: 91%

“…Only mild yellowing occurred upon glyphosate application, without compromising the visual quality (intense green color) of the lawn. The symptoms caused by metsulfuron-methyl would be classified as moderate for the second (11.2%), third (11.6%), and fourth (14.6%) evaluations but as mild in the first (8.7%) and fifth (9.7%) evaluations, according to Costa et al (2010); in contrast, the symptoms caused by glyphosate would be classified as mild in all evaluations (3.3 to 7.5%). Grichar and Havlak (2010) also reported that metsulfuron-methyl (14.17 g ha -1…”

Section: Resultsmentioning

confidence: 99%

“…The opposite was reported by Rogers (1985), who noted that the herbicide application (140 g ha -1 ) was effective at controlling bahiagrass height and caused no significant visual damage for a period of up to 77 DAA. Costa et al (2010), when evaluating metsulfuron-methyl application (2.4 g ha -1…”

Section: Resultsmentioning

confidence: 99%

“…Each leaf was placed in the measurement area of the chlorophyll meter, and one measurement was collected per leaf from the middle of the leaf blade; c) leaf dry matter was assessed by manually collecting material using scissors near the soil surface to remove the green matter of leaves from the plants contained in one square meter, with three replicates collected per plot to form a composite sample that was stored in a labeled, brown paper bag and dried in an oven at 65°C for 72 hours; d) the leaf N concentration was assessed according to the methodology reported by Malavolta et al (1997); and e) The phytotoxicity on lawn grass shoots was evaluated using a visual grading scale (0-100%), with "0%" corresponding to the "absence of injuries" and "100%" corresponding to the "total death" of the lawn grass (SOCIEDADE BRASILEIRA DA CIÊNCIA DAS PLANTAS DANINHAS, 1995). The methodology by Costa et al (2010), who considered mild, moderate, and severe and aesthetically non-acceptable symptoms to correspond to grades lower than or equal to 10.0%, from 10.1 to 20.0%, and higher than 20.0%, respectively, was adopted to interpret the phytotoxicity to emerald Zoysia. The criteria used in the present study to establish these phytotoxicity grades were the number and evenness of injuries (yellowing, loss of the intense green color), the onset of dead plants, and lawn grass density (absence of patches with exposed soil and/or leaf thinning).…”

Section: Methodsmentioning

confidence: 99%

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Application of herbicides as growth regulators of emerald Zoysia grass fertilized with nitrogen

et al. 2015

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Nitrogen (N) is essential for nutrition and for the maintenance of the intense green color of lawns. However, this element affects shoot growth and, therefore, mowing frequency, which is a key factor of lawn-maintenance costs. Accordingly, this study aimed to evaluate the use of nitrogen fertilization in combination with the use of potential herbicides as growth regulators to promote the maintenance of the high visual (intense green) and nutritional quality of lawns of emerald Zoysia (Zoysia japonica Steud.) grown in Ultisol soil while reducing their leaf growth. The experiment was conducted at the Teaching, Research and Extension Education Farm (Fazenda de Ensino, Pesquisa e Extensão) of São Paulo State University (Universidade Estadual Paulista Júlio de Mesquita Filho, UNESP), Ilha Solteira Campus/ São Paulo (SP), from June/2012 to June/2013. The experimental design consisted of randomized blocks with 20 treatments established in a 5 x 4 factorial arrangement with four replicates, including four herbicides (glyphosate, imazaquin, imazethapyr, and metsulfuron-methyl, applied at doses of 200, 420, 80, and 140 g ha -1 active ingredient (a.i.), respectively) and a control (without herbicide), and four N doses (0, 5, 10, and 20 g m -2 ), split into five applications delivered throughout the year. The following items were evaluated: length, LCI (leaf chlorophyll index), leaf dry matter production and leaf N concentration and the percentage of phytotoxicity on lawn grass shoots. Doses from 10 to 20 g m -2 N provided sufficient N concentrations to maintain the emerald Zoysia. The herbicides metsulfuron-methyl and glyphosate were superior in the control of lawn leaf growth. While the former was phytotoxic, the latter had no effect on the aesthetic quality of the lawn, standing out as an herbicide that may be used at a dose of 200 g ha -1 to regulate the growth of emerald Zoysia. fator do custo de manutenção em gramados. Neste contexto, objetivou-se avaliar a adubação nitrogenada e o uso potencial de herbicidas como reguladores de crescimento em grama esmeralda (Zoysia japonica Steud.), em Argissolo Vermelho, visando manter o gramado com boa qualidade visual (verde intenso) e nutricional bem como reduzir o seu crescimento foliar. O experimento foi conduzido na Fazenda de Ensino, Pesquisa e Extensão da UNESP, Campus de Ilha Solteira/SP, de junho/2012 a junho/2013. Utilizou-se o delineamento em blocos casualizados com 20 tratamentos dispostos num fatorial 5 x 4 com quatro repetições, sendo quatro herbicidas: glyphosate, imazaquin, imazethapyr e metsulfuronmethyl aplicados na dose de, respectivamente, 200, 420, 80 e 140 g ha -1 do ingrediente ativo (i.a.) e a testemunha -sem herbicida; e quatro doses de N: 0, 5, 10 e 20 g m -2 , parceladas em cinco aplicações durante o ano. Avaliaram-se: o comprimento, o índice ICF (índice de clorofila foliar) e a produção de matéria seca das folhas, determinaram-se também a concentração foliar de N e a porcentagem de fitointoxicação da parte aérea do gramado. Doses de 10 a 20 g m ...

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“…Conversely, Costa et al (2010) observed a dry matter increase of emerald Zoysia at 49 DAA of metsulfuron-methyl (2.4 g ha -1 ) compared to the control (without application).…”

Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Application of herbicides as growth regulators of emerald Zoysia grass fertilized with nitrogen

et al. 2015

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Preemergence herbicide effects on St. Augustinegrass establishment

et al. 2023

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St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] is one of the most common turfgrass lawn species of warm-season climates. Like many turfgrasses, it is produced as sod. Weed control during sod production is problematic, due in part to intolerance of St. Augustinegrass to a range of useful turfgrass herbicides, and because the open canopy and growth-conducive conditions of sod production favor certain difficult-to-control weeds. Although those weeds are best preventatively controlled using preemergence herbicides, many preemergence herbicides also adversely affect vegetative propagation of turfgrasses. Field research was conducted at the Mississippi State University, near Starkville, Mississippi, USA, to evaluate the effects of dithiopyr, pendimethalin, prodiamine, liquid-and granular-applied oxadiazon, atrazine, S-metolachlor, atrazine + S-metolachlor, and indaziflam on St.Augustinegrass establishment from plugs. Plots (2.25 m 2 ) were planted with 10 plugs (225 cm 2 apiece), and preemergence herbicides were applied at standard use rates 1 day after planting. Visual estimates of percentage cover were collected weekly, and aerial imagery was collected weekly to biweekly. Visual cover and vegetation index data were regressed to estimate days to reach 50% maximum nontreated response. Liquid-applied oxadiazon and atrazine were the only treatments that did not increase days to reach 50% cover in both replication years. Dithiopyr, prodiamine, S-metolachlor, and indaziflam increased days to reach 50% cover in both replication years. The normalized difference vegetation index, ratio vegetation index, and chlorophyll index-red edge derived from an aerial sensor, detected similar, but fewer, treatment differences compared to estimated visual cover. INTRODUCTIONSt. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] is a commonly grown lawn grass in the southeastern Abbreviations: CIRE, chlorophyll index-red edge; NDVI, normalized difference vegetation index; RVI, ratio vegetation index.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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