Action of rain on formulations of glyphosate mixed with saflufenacil for the control of Brachiaria decumbens

Costa, Andréia Cristina Rodrigues da; Gonçalves, Clebson Gomes; Silva, Antonio Carlos da; Cardoso, Leonildo; Martins, Dagoberto

doi:10.1590/1808-1657000172015

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SCIENTIFIC ARTICLE • Arq. Inst. Biol. 84 • 2017 • https://doi.org/10.1590/1808-1657000172015 copy

Action of rain on formulations of glyphosate mixed with saflufenacil for the control of Brachiaria decumbens

Ação da chuva em formulações de glyphosate em mistura com saflufenacil no controle de Brachiaria decumbens

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

This study aimed to evaluate the effects of rain on the efficiency of different formulations of glyphosate applied in isolation and in combination with saflufenacil on the control of Brachiaria decumbens. This study was conducted during the first half of 2013. The treatments consisted of an isolated application of three formulations of glyphosate (Roundup Original, Roundup Transorb R, and Roundup WG) at 1,080 g a.e. ha^-1 and mixed with saflufenacil at 24.5 g a.e. ha^-1 + Dash at 0.5% v/v at six time intervals of simulated rain: 15, 30, 60, 120, 240 and 360 minutes after application of herbicides and a control treatment without rain. We performed visual evaluations of plant control at 4, 7, 14, 21 and 28 days after application of herbicides. The mixture of saflufenacil + Dash with the original Roundup formulations, Roundup Transorb R and Roundup WG increased the control speed of B. decumbens plants regardless of the rain interval studied. The formulations of glyphosate (Roundup Transorb R and Roundup WG) applied in isolation were affected by rains that occurred shortly after spraying. In combination with saflufenacil + Dash, there was a synergistic effect on weed control.

KEYWORDS:
Brachiaria; efficacy; herbicide; weed

Periods Without rain	Treatments
	saf. + R. Original¹	saf. + R. Transorb R¹	saf. + R. WG¹	saflufenacil¹	R. Original	R. Transorb	R. WG
	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5) (g a.i. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )
15 min	7.3 a D	2.3 ab C	4.30 ab C	3.3 ab B	0.0 b B	0.0 b A	0.0 b A
30 min	8.5 a D	6.5 ab C	7.00 ab BC	3.3 ab B	0.0 b B	0.0 b A	0.0 b A
1 hour	21.5 a BC	17.8 ab B	10.30 bc BC	4.8 cd B	0.0 d B	0.0 d A	0.0 d A
2 hours	33.3 a ABC	18.5 ab B	14.00 bc AB	8.0 c AB	0.0 d B	0.0 d A	0.0 d A
4 hours	30.0 a A	19.0 b B	8.80 c BC	5.5 cd B	0.0 d B	0.0 d A	0.0 d A
6 hours	20.0 a C	19.5 a B	11.80 b BC	9.3 b AB	0.0 c B	0.0 c A	0.0 c A
No Rain	28.0 a AB	28.3 a A	19.55 b A	15.0 b A	7.3 c A	2.3 c A	5.0 c A
Treatment (T)				148.65**
Rainfall (C)				41.35**
TxC				5.01**
CV%				42.82
d.m.s				2.71

Periods Without rain	Treatments
	saf. + R. Original¹	saf. + R. Transorb R¹	saf. + R. WG¹	saflufenacil¹	R. Original	R. Transorb	R. WG
	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5) (g a.i. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )
15 min	96.0 a A	37.5 bc D	96.0 a AB	0.00 d A	50.0 b B	0.0 d C	15.0 cd C
30 min	99.0 a A	53.5 bc CD	83.0 ab AB	0.00 d A	62.8 bc B	47.8 c B	47.5 c B
1 hour	99.0 a A	60.0 bc BCD	89.5 ab AB	0.00 d A	62.3 bc B	46.0 c B	62.5 bc B
2 hours	99.0 a A	81.8 ab ABC	64.5 b B	0.00 c A	99.0 a A	99.0 a A	99.0 a A
4 hours	99.0 a A	85.5 a AB	99.0 a A	0.00 b A	99.0 a A	99.0 a A	99.0 a A
6 hours	99.0 a A	97.0 a A	80.5 a AB	0.00 b A	99.0 a A	99.0 a A	99.0 a A
No Rain	99.0 a A	99.0 a A	99.0 a A	2.50 b A	100.0 a A	99.0 a A	99.0 a A
Treatment (T)				123.99**
Rainfall (C)				33.85**
TxC				5.63**
CV%				21.90
d.m.s				12.14

Periods Without rain	Treatments
	saf. + R. Original¹	saf. + R. Transorb R¹	saf. + R. WG¹	saflufenacil¹	R. Original	R. Transorb	R. WG
	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5) (g a.i. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )
15 min	100.0 a A	72.5 b B	100.0 a A	0.00 d A	100.0 a A	1.3 d B	37.5 c B
30 min	100.0 a A	91.3 a AB	100.0 a A	0.00 b A	100.0 a A	87.5 a A	81.3 a A
1 hour	100.0 a A	93.3 a AB	100.0 a A	0.00 b A	100.0 a A	93.8 a A	93.8 a A
2 hours	100.0 a A	94.5 a AB	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
4 hours	100.0 a A	98.8 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
6 hours	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
No Rain	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
Treatment (T)				310.99**
Rainfall (C)				23.12**
TxC				7.30**
CV%				13.46
d.m.s				8.65

Periods Without rain	Treatments
	saf. + R. Original¹	saf. + R. Transorb R¹	saf. + R. WG¹	saflufenacil¹	R. Original	R. Transorb	R. WG
	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5) (g a.i. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )
15 min	100.0 a A	79.8 b B	100.0 a A	0.00 c A	100.0 a A	5.0 c B	66.8 b B
30 min	100.0 a A	95.0 a AB	100.0 a A	0.00 b A	100.0 a A	90.0 a A	86.3 a A
1 hour	100.0 a A	97.8 a AB	100.0 a A	0.00 b A	100.0 a A	99.5 a A	99.3 a A
2 hours	100.0 a A	97.3 a AB	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
4 hours	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
6 hours	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
No Rain	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
Treatment (T)				493.56**
Rainfall (C)				22.79**
TxC				9.16**
CV%				10.62
d.m.s				6.95

Periods Without rainfall	Treatments
	saf. + R. Original¹	saf. + R. Transorb R¹	saf. + R. WG¹	saflufenacil¹	R. Original	R. Transorb	R. WG
	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5 + 1,080) (g a.i./a.e. ha^-1 )	(24.5) (g a.i. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )	(1,080) (g a.e. ha^-1 )
15 min	100.0 a A	87.5 b B	100.0 a A	0.00 d A	100.0 a A	22.5 c B	87.5 b B
30 min	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	99.8 a A	99.8 a A
1 hour	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	99.8 a A
2 hours	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
4 hours	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
6 hours	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
No Rain	100.0 a A	100.0 a A	100.0 a A	0.00 b A	100.0 a A	100.0 a A	100.0 a A
Treatment (T)				2,599.04**
Rainfall (C)				57.77**
TxC				30.95**
CV%				4.60
d.m.s				3.07

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[1] *Corresponding author: goncalvescg.agro@hotmail.com