Planta Daninha (2003) 21, S79-S84

C.A. Carbonari, D. Martins and M.A. Terra (2003)
Controle de Brachiaria subquadripara e Brachiaria mutica através de diferentes herbicidas aplicados em pós-emergência
[Control of Brachiaria subquadripara and Brachiaria mutica by different herbicides applied post-emergence]
Planta Daninha 21 (special issue), S79-S84
Abstract: Two experiments were carried out to evaluate the susceptibility of Brachiaria subquadripara and Brachiaria mutica to different herbicides applied in post-emergence. The herbicides and doses used were: glyphosate (Rodeo) at 2,400, 3,360 and 4,320 (g a.e. ha^-1) plus Aterbane 0.5% v/v; glyphosate at 2,400, 3,360 and 4,320 (g a.e. ha^-1) plus Silwet 0.1% v/v; imazapyr (Arsenal) at 750 and 1,500 (g a.e. ha^-1), diquat (Reward) at 400 and 800 (g a.i. ha^-1) with sequential application and an untreated control. The experimental plots were constituted of 60 x 60 x 45 cm water reservoirs, with 55 L of soil. Herbicides were applied when the plants reached 45 and 65 cm for B. subquadripara and B. mutica, respectively. A CO₂ backpack sprayer was used with 2 bars, 110.02 XR nozzles and consumption of 200 L ha^-1 spray solution. The control was visually evaluated, through percentile note scale, and plant dry mass as well. The herbicide glyphosate (doses of 3,360 and 4,320 g a.e. ha^-1) showed an excellent control for the two species, regardless of the adjuvant tested. However, the plots that had received glyphosate at 2,400 g a.e. ha^-1 showed only a satisfactory control. The herbicide imazapyr (doses 750 and 1,500 g a.e. ha^-1) provided an effective control for B. subquadripara and a very effective control for B. mutica. The herbicide diquat, although applied twice and regardless of the dosage used, was found to be inefficient in controlling the two species.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Caio A. Carbonari

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Urochloa mutica (weed)		Brazil (south)
	Urochloa distachya (weed)		Brazil (south)