Brachiaria brizantha control by using fluazifop-p-butil on Tifton 85 pasture formation

Abstract

-This study was carried out with the aim of assessing the efficacy of the fluazifop-p-butyl herbicide to control Sixty days after application, plants were harvested at ground level and oven-dried. Regrowth was assessed in the same manner, 60 days after cutting, to determine their dry weight. Control of B. brizantha was noted to be above 50%, from doses of 218.75 g ha -1 at 45 days after application. The fluazifop-p-butylherbicide did not show to be efficient in the control of B. brizantha in the doses assessed and caused intoxication to Tifton 85 plants.

CHLOROPHYLL FLUORESCENCE IN Brachiaria decumbens AND Brachiaria ruziziensis SUBMITTED TO HERBICIDES

“…There are studies that report the use of herbicides in the control of forage grasses of different genera (Santos et al, 2012). However, there are few studies in the literature with the use of herbicides evaluating the physiological responses of forage species of the same taxonomic genus, such as Brachiaria.…”

Controle e susceptibilidade de capim-braquiária e capim-ruziziensis ao glyphosate e fluazifop-p-butil

“…Existem trabalhos que reportam o uso de herbicidas no controle de plantas gramíneas forrageiras de diferentes gêneros (Santos et al 2008(Santos et al , 2012, no entanto, há poucos estudos na literatura com o uso de herbicidas avaliando a seletividade de espécies forrageiras do mesmo gênero taxonômico, como Brachiaria. Desse modo, fica evidente a necessidade do conhecimento sobre a susceptibilidade diferencial do capim-braquiária e capim-ruziziensis aos herbicidas para idealizar estratégias de renovação de pastagens.…”

“…54,AM,Souza Sobrinho,F,Rocha,WSD,Martins,CE,Demartini, D, & Costa, TR 2011a, 'Suscetibilidade diferencial de espécies de 82% aos 29 DAA com utilização de 125 g ha -1 de fluazifop-p-butil, em plantas com dois perfilhos. Além disso, Santos et al (2012) observaram controle de B. brizantha de 84% em pastos de tifton 85 aos 21 DAA, utilizando 250 g ha -1 de fluazifop-p-butil em plantas com 0,20 m de altura. Marques et al (2011) avaliando diferentes herbicidas no controle de capim-braquiária aos 15, 23 e 48 dias após a emergência da planta, verificou intoxicação de 100, 91 e 9%, respectivamente, com a dose de 150 g ha -1 de fluazifop-p-butil.…”

“…Possivelmente as menores doses tenham inibido parcial ou temporariamente a enzima ACCase, não ocasionando o aumento da senescência de tecidos das plantas. Santos et al (2012) observaram, em capim-marandu com 0,20 m de altura, decréscimo na massa total a partir da dose de 125 g ha -1 de fluazifop-p-butil, aos 60 DAA.…”

Selectivity and efficiency of herbicides in warm season turfgrass varieties

“…C. rotundus is a weed that occurs during the entire cycle of several commercial crops and has a difficult management (Silveira et al, 2010) due to its competition capabilities and its aggressiveness, as well as its control and eradication difficulty. Urochloa species are weeds of perennial cycle and slower growth (Bianco et al, 2005) and also of hard control due factors inherent to the species such as morphological characteristics and the large amount of seed produced (Santos et al, 2012).…”