Seletividade de herbicidas aplicados em pós-emergência em espécies de grama
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2018-02-23
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Universidade Estadual Paulista (Unesp)
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As plantas daninhas interferem nos gramados, prejudicando a sua formação, estabelecimento, qualidade e estética. Destaca-se dentre as diversas técnicas o uso de herbicidas, entretanto, são escassas as informações referentes a seletividade desses produtos em gramados. Desse modo, o objetivo desse trabalho foi avaliar a seletividade de herbicidas aplicados em pós-emergência sobre as espécies Axonopus compressus (grama São Carlos), Paspalum notatum (grama Batatais), Zoysia japonica (grama Esmeralda) Cynodon dactylon x Cynodon transvaalensis (grama Bermuda - Tifton 419). Foram realizados dois experimentos, todos em casa de vegetação e repetidos em diferentes momentos. As quatro espécies de grama foram transplantadas em vasos com capacidade de 2 L e aos 40 dias após o transplantio foram realizadas as aplicações dos tratamentos. Os tratamentos constituíram-se pela aplicação de 13 herbicidas (g i.a. ha-1): chlorimuron-ethyl (15); halosulfuron (112,5); imazapyr (125,0); metsulfuron-methyl (2,4); dicamba (288); triclopyr (600); 2,4-D (2010); clomazone nas formulações convencional e microencapsulada (1200); atrazine (1250); bentazon (600); flumioxazin (30); sulfentrazone (600), além de tratamento controle (sem aplicação de herbicida) para cada espécie estudada. O delineamento experimental utilizado foi inteiramente casualizado com quatro repetições. As avaliações da taxa de cobertura verde (TCV) das espécies de gramas foram realizadas aos 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 41, 48, 55 e 62 dias após a aplicação (DAA); altura e fitointoxicação nos mesmos período da TCV exceto ao 0 DAA. Avaliou-se também aos teores de clorofila total e carotenoides aos 9, 18 e 27 DAA e biomassa seca das aparas aos 27 e 62 DAA. Os dados obtidos foram submetidos à análise de variância pelo teste F, sendo para os teores de clorofila total e biomassa seca das aparas, às médias comparadas pelo teste Tukey (p≤0,05). Já os resultados de TCV, fitointoxicação e altura dos herbicidas os dados da diferença mínima significativa (DMS) foram representadas nos gráficos. Os efeitos dos herbicidas observados nas diferentes espécies de grama foi dependente da espécie, herbicida, época e recuperação do gramado. Os herbicidas que apresentaram potencial de seletividade para o gramado de A. compressus e P. notatum foram a atrazine, bentazon, chlorimuron-ethyl, dicamba, flumioxazin, halosulfuron, metsulfuron-methyl e sulfentrazone. Já para o gramado de Z. japonica foram considerados atrazine, bentazon, chlorimuron-ethyl, dicamba, halosulfuron, metsulfuron-methyl e 2,4-D flumioxazin e sulfentrazone. Com exceção do triclopyr, os produtos seletivos para Z. japonica podem também ser considerados seletivos para a grama Tifton 419.
Weeds interfere with turfgrass, hampering their formation, establishment, quality and aesthetics. Among the several techniques, the use of herbicides stands out, however, the information regarding the selectivity of these products in turfgrass is scarce. Thus, the aim of this work was to evaluate the selectivity of herbicides applied in post-emergence on the species Axonopus compressus (broadleaf carpetgrass), Paspalum notatum (bahiagrass), Zoysia japonica (japanese lawn grass), Cynodon dactylon x Cynodon transvaalensis (bermudagrass -Tifton 419). Two studies were conducted, all in a greenhouse and repeated at different times. The four turfgrass species were transplanted in vessels with a capacity of 2 L and at 40 days after transplanting the applications of the treatments. The treatments consisted of the application of 13 herbicides (g i.a. ha-1): chlorimuron-ethyl (15); halosulfuron (112.5); imazapyr (125.0); metsulfuron-methyl (2.4); dicamba (288); triclopyr (600); 2,4-D (2010); clomazone in conventional and microencapsulated formulations (1200); atrazine (1250); bentazon (600); flumioxazin (30); sulfentrazone (600), in addition to control treatment (without herbicide application) for each species studied. The experimental design was completely randomized with four replicates. The green cover rate (TCV) evaluations of the turfgrass species were performed at 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 41, 48, 55 and 62 days after application (DAA); and height and phytointoxication, in the same TCV period, except for 0 DAA. The levels of total chlorophyll and carotenoids were evaluated at 9, 18 and 27 DAA and dry biomass of the shavings at 27 and 62 DAA. The obtained data were submitted to analysis of variance by the F test, being the total chlorophyll content and dry biomass of the chips, compared to the Tukey test (p≤0.05). On the other hand, the results of TCV, phytotoxification and herbicide height showed the minimum significant difference data (DMS). It was observed that the selectivity of the herbicides was dependent on turfgrass species, herbicide, season and plants recovery. The herbicides with selectivity potential for P. notatum e A. compressus were atrazine, bentazon, chlorimuron-ethyl, dicamba, flumioxazin, halosulfuron, metsulfuron-methyl e sulfentrazone. For the Z. japonica were, atrazine, bentazon, chlorimuron-ethyl, dicamba, flumioxazin, halosulfuron, metsulfuron-methyl, sulfentrazone and 2,4-D. With the exception of triclopyr, selective products for Z. japonica can also be considered selective for Tifton 419 tufgrass.
Weeds interfere with turfgrass, hampering their formation, establishment, quality and aesthetics. Among the several techniques, the use of herbicides stands out, however, the information regarding the selectivity of these products in turfgrass is scarce. Thus, the aim of this work was to evaluate the selectivity of herbicides applied in post-emergence on the species Axonopus compressus (broadleaf carpetgrass), Paspalum notatum (bahiagrass), Zoysia japonica (japanese lawn grass), Cynodon dactylon x Cynodon transvaalensis (bermudagrass -Tifton 419). Two studies were conducted, all in a greenhouse and repeated at different times. The four turfgrass species were transplanted in vessels with a capacity of 2 L and at 40 days after transplanting the applications of the treatments. The treatments consisted of the application of 13 herbicides (g i.a. ha-1): chlorimuron-ethyl (15); halosulfuron (112.5); imazapyr (125.0); metsulfuron-methyl (2.4); dicamba (288); triclopyr (600); 2,4-D (2010); clomazone in conventional and microencapsulated formulations (1200); atrazine (1250); bentazon (600); flumioxazin (30); sulfentrazone (600), in addition to control treatment (without herbicide application) for each species studied. The experimental design was completely randomized with four replicates. The green cover rate (TCV) evaluations of the turfgrass species were performed at 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 41, 48, 55 and 62 days after application (DAA); and height and phytointoxication, in the same TCV period, except for 0 DAA. The levels of total chlorophyll and carotenoids were evaluated at 9, 18 and 27 DAA and dry biomass of the shavings at 27 and 62 DAA. The obtained data were submitted to analysis of variance by the F test, being the total chlorophyll content and dry biomass of the chips, compared to the Tukey test (p≤0.05). On the other hand, the results of TCV, phytotoxification and herbicide height showed the minimum significant difference data (DMS). It was observed that the selectivity of the herbicides was dependent on turfgrass species, herbicide, season and plants recovery. The herbicides with selectivity potential for P. notatum e A. compressus were atrazine, bentazon, chlorimuron-ethyl, dicamba, flumioxazin, halosulfuron, metsulfuron-methyl e sulfentrazone. For the Z. japonica were, atrazine, bentazon, chlorimuron-ethyl, dicamba, flumioxazin, halosulfuron, metsulfuron-methyl, sulfentrazone and 2,4-D. With the exception of triclopyr, selective products for Z. japonica can also be considered selective for Tifton 419 tufgrass.
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gramados, plantas daninhas, Axonopus compressus, Paspalum notatum, Zoysia japonica, Cynodon dactylon x Cynodon transvaalensis