Halauxifen-Methyl+Diclosulam: New Option to Control <i>Conyza</i> spp. Prior Soybean Sowing

KRENCHINSKI, F.H.; PEREIRA, V.G.C.; ZOBIOLE, L.H.S.; ALBRECHT, A.J.P.; ALBRECHT, L.P.; PETERSON, M.

doi:10.1590/S0100-83582019370100059

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Article • Planta daninha 37 • 2019 • https://doi.org/10.1590/S0100-83582019370100059 copy

Halauxifen-Methyl+Diclosulam: New Option to Control Conyza spp. Prior Soybean Sowing

Halauxifen-Methyl+Diclosulam: Nova Opção para o Controle de Conyza spp. em Pré-Semeadura da Soja

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

Control of Conyza spp. prior to soybean sowing has faced difficulties because of the resistance cases in Brazil, hence new herbicides as halauxifen-methyl + diclosulam are important to manage this specie. The objective of this research was to evaluate the effectiveness of the herbicide halauxifen-methyl + diclosulam applied at pre-planting of soybean. The experiments were set up in three locations in Paraná State, Brazil, in the 2015/2016 season. The herbicide halauxifen-methyl + diclosulam was associated with glyphosate and compared to other commercial herbicide to Conyza spp. control. The application occurred 15 days before soybean sowing, in plants of Conyza spp. with an average height of 20-35 cm in the three areas. None of the treatments promoted Conyza spp. control above 90%, when soybean was at the V1 stage; however, the findings showed that halauxifen-methyl + diclosulam promoted better control in comparison to the other treatments. The control reached >90% at V3 soybean development stage, in which treatments containing glyphosate + halauxifen-methyl + diclosulam were more effective than the other treatments. In addition, treatments with glyphosate + halauxifen-methyl + diclosulam decreased dry matter content of Conyza spp. between 87 and 93%, depending on the location, when compared to the control. The burndown treatment to Conyza spp. with glyphosate + halauxifen-methyl + diclosulam did not decrease soybean yield, and it was always higher than the untreated check.

Keywords:
burn down; Conyza spp. control.; Arylpicolinate herbicide; auxin mimic herbicide; Glycine max

Sociedade Brasileira da Ciência das Plantas Daninhas Departamento de Fitotecnia - DFT, Universidade Federal de Viçosa - UFV, 36570-000 - Viçosa-MG - Brasil, Tel./Fax::(+55 31) 3899-2611 - Viçosa - MG - Brazil
E-mail: rpdaninha@gmail.com

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[1] * Corresponding author: <fhkrenchinski@gmail.com>

Treatment	Active ingredient	Rates g a.e. or a.i. ha^-1
T1	Untreated	-
T2	Hand-weeded	-
T3	Glyphosate⁽¹⁾ + saflufenacil⁽²⁾	1440 + 24.5
T4	glyphosate + diclosulam⁽³⁾	1440 + 29
T5	glyphosate + chlorimuron-ethyl⁽⁴⁾	1440 + 20
T6	glyphosate + 2,4-D⁽⁵⁾	1440 + 1005
T7	glyphosate + 2,4-D + saflufenacil	1440 + 1005 + 24.5
T8	glyphosate + 2,4-D + diclosulam	1440 + 1005 + 29
T9	glyphosate + 2,4-D + chlorimuron-ethyl	1440 + 1005 + 20
T10	glyphosate + (halauxifen-methyl + diclosulam)⁽⁶⁾	1440 + 30.6 (25.52 + 5.06)
T11	glyphosate + (halauxifen-methyl + diclosulam)⁽³⁾	1440 + 38.2 (31.90 + 6.32)

	E1	E2	E3
	Assis Chateaubriand	Iporã	Francisco Alves
Application date	09/19/15	10/08/15	10/07/15
Relative humidity %	62.0	63.0	57.0
Temperature ^oC	33.0	29.0	28.7
Wind speed km h^-1	2.2	4.2	2.3
Conyza spp. growth stage (cm)	30-35	20-25	20-30
Density plants m^-2	12	26	21

Sources of variation	% Control		Dry weight of Conyza	% control 14 DAA	% control at 28 days after glyphosate application
Sources of variation	V₁	V₃	V₃	V₆	R₁
P⁽³⁾ treat.⁽¹⁾	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001
P exp.⁽²⁾	<0.0001	<0.0001	<0.0001	<0.0001	0.0001
P treat. by exp.	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001
Sources of variation	Height of 1st pods	Final height	Number of ods	100-seed weight	Yield
Sources of variation	R₈	R₈	R₈
P⁽³⁾ treat.⁽¹⁾	0.0220	0.0483	<0.0001	0.0097	<0.0001
P exp.⁽²⁾	<0.0001	0.0010	<0.0001	<0.0001	<0.0001
P treat. by exp.	0.0328	0.0331	<0.0001	0.0002	0.0001

Treatment	% Control		Dry weight of Conyza	CGA 14 DAA*	CGA 28 DAA
Treatment	V₁	V₃	V₃	V₆	R₁
T1	0.00 G	0.00 G	145.50 A	0.00 H	0.00 G
T2	100.00 A	100.00 A	0.00 D	100.00 A	100.00 A
T3	55.00 DE	33.00 EF	38.50 BC	29.50 D	13.25 EF
T4	41.25 F	35.75 E	35.50 BC	27.25 D	17.50 D
T5	42.75 E	28.50 F	45.00 B	14.25 G	9.50 F
T6	63.50 D	43.50 D	40.40 BC	20.00 EF	12.00 EF
T7	70.75 C	39.50 DE	30.50 BC	22.75 E	13.75 DE
T8	62.75 D	55.25 C	18.50 CD	16.50 FG	10.50 EF
T9	68.25 C	54.00 C	26.50 BC	20.75 E	13.25 EF
T10	68.25 C	92.00 B	13.50 CD	70.50 C	62.00 C
T11	81.50 B	97.25 AB	16.50 CD	75.25 B	66.00 B
Average	59.56	52.61	16.67	36.06	23.47
CV%	6.01	5.42	29.28	4.48	5.81
LSD	8.47	6.53	25.64	2.62	3.89

Treatment	% Control		Dry weight of Conyza	CGA 14 DAA*	CGA 28 DAA
Treatment	V₁	V₃	V₃	V₆	R₁
T1	0.00 H	0.00 H	84.51 A	0.00 H	0.00 D
T2	100.00 A	100.00 A	0.00 D	100.00 A	100.00 A
T3	72.75 C	50.75 E	32.50 B	13.25 DE	0.00 D
T4	36.00 G	36.50 F	28.50 B	14.00 D	0.00 D
T5	43.75 F	29.50 G	17.00 BC	8.75 G	0.00 D
T6	64.00 E	44.75 DE	23.50 BC	10.50 FG	0.00 D
T7	71.00 CD	42.00 E	21.50 BC	12.00 DEF	0.00 D
T8	65.50 DE	49.00 CD	17.50 BC	8.50 G	0.00 D
T9	64.75 DE	41.50 E	18.50 BC	11.75 EF	0.00 D
T10	69.00 CDE	92.75 B	11.00 CD	85.25 C	82.50 C
T11	79.50 B	92.00 B	9.00 CD	90.25 B	88.25 B
Average	60.56	52.88	23.95	32.20	24.25
CV%	4.65	3.75	27.58	2.74	1.58
LSD	6.66	4.72	15.97	2.05	0.90

Treatment	Height of 1^st Pods^ns	Final height^ns	Number of pods^ns	100 seed weight ^ns	Yield
Treatment	R₈	R₈	R₈	100 seed weight ^ns	Yield
T1	18.00	75.41	37.83	17.25	2898.73 B
T2	16.80	79.62	34.08	16.39	4031.12 A
T3	20.12	84.45	35.45	16.71	3871.27 AB
T4	19.04	83.91	43.08	16.70	3714.81 AB
T5	18.24	87.33	38.04	17.25	3745.13 AB
T6	18.16	86.54	36.08	16.70	3753.63 AB
T7	18.04	81.42	38.13	16.18	3732.38 AB
T8	16.96	89.62	34.70	17.02	3815.20 AB
T9	19.25	83.54	39.12	17.21	3797.73 AB
T10	18.54	85.75	39.25	16.19	4009.83 A
T11	17.25	79.62	38.25	16.76	3952.58 A
Average	18.15	83.38	37.64	16.67	3753.15
CV%	10.71	9.18	16.37	5.54	11.14
LSD	4.54	17.96	14.43	2.16	973.40

Treatment	Height of 1^st Pods^ns	Final height ^ns	Number of pods^ns	100 seed weight ^ns	Yield
T1	11.42	73.42	53.68	14.33	1240.71 B
T2	14.00	79.96	77.75	13.87	5457.14 A
T3	11.88	82.00	64.33	13.96	4486.32 A
T4	13.58	80.58	61.50	14.82	4944.32 A
T5	12.13	83.29	66.54	15.97	4579.40 A
T6	13.79	84.92	72.25	14.94	4743.45 A
T7	12.83	87.68	72.63	16.50	4918.54 A
T8	14.17	84.54	63.33	16.28	4783.19 A
T9	13.96	85.92	74.33	14.18	4251.42 A
T10	12.34	85.83	57.00	14.12	4790.07 A
T11	13.13	82.21	68.63	14.49	5445.12 A
Average	13.02	82.75	66.54	14.85	4512.69
CV%	13.42	18.28	23.65	9.28	20.11
LSD	4.08	35.35	37.69	3.27	2151.88

Treatment	Height of 1^st Pods^ns	Final height^ns	Number of pods	100 seed weight	Yield
T1	15.12	83.13	23.00B	8.29B	464.71 B
T2	13.38	97.58	40.92A	12.38A	4576.06 A
T3	13.21	87.33	42.79A	11.33A	3670.50 A
T4	12.71	88.58	47.79A	11.03A	3876.09 A
T5	13.08	84.21	44.92A	10.82A	3684.60 A
T6	13.25	84.50	40.75A	11.23A	3795.98 A
T7	13.62	89.25	43.17A	11.78A	3760.54 A
T8	13.62	85.38	46.58A	11.24A	3711.42 A
T9	14.29	90.67	36.88AB	11.59A	4397.60 A
T10	13.83	89.29	44.13A	10.97A	4247.39 A
T11	13.67	86.42	43.25A	11.46A	4233.02 A
Average	13.61	87.84	41.29	11.1 0	3674.35
CV%	11.11	7.27	15.14	7.21	13.06
LSD	3.54	14.89	15.08	1.91	1160.61