Weed Management in Beans Using Subdoses of Fluazifop-P-Butyl + Fomesafen

GALON, L.; CASTOLDI, C.T.; FORTE, C.T.; DE DAVID, F.A.; PERIN, G.F.; RADUNZ, A.L.

doi:10.1590/S0100-83582018360100054

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Article • Planta daninha 36 • 2018 • https://doi.org/10.1590/S0100-83582018360100054 copy

Weed Management in Beans Using Subdoses of Fluazifop-P-Butyl + Fomesafen

Manejo de Plantas Daninhas na Cultura do Feijão com Subdoses de Fluazifop-P-Butil + Fomesafen

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The objective of this work was to evaluate the effect of reduced doses of the commercial mixture composed of fluazifop-p-butil + fomesafen, applied for the management of common weeds in beans. The experiment was conducted in a completely randomized block design, with a 5x2+1 factorial arrangement and with four replications. In factor A, there were five percentual doses (100, 87.5, 75.0, 62.5 and 0.0%), in relation to the recommended commercial dose (2 L ha-1) of fluazifop-p-butil + fomesafen, which corresponded to 2.00; 1.75; 1.50; 1.25 and 0.00 L ha-1. Factor B was composed by two development stages of black beans (three and eight trefoils) and weeds: black-jack (two to four and four to eight leaves) and southern crabgrass (two leaves to one tiller and one to four tillers) with one weeded control treatment. The variables evaluated for the control of black-jack and southern crabgrass were: herbicide phytotoxicity to the crop, number of pods per plant, number of grains per pod, 1,000 grain weight and grain yield of the crop. The results demonstrated that the use of fluazifop-p-butil + fomesafen, at all evaluated doses evaluated and application periods, caused low phytotoxicity to the crop, less than 12%. The use of reduced doses of this herbicide presents efficient control of black-jack and southern crabgrass, mainly at the initial development stages of these weed species. The economic threshold dosage of fluazifop-p-butil + fomesafen to control these weeds was 1.23 L ha-1.

Keywords:
Phaseolus vulgaris; Bidens pilosa; Digitaria ciliares

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

Acompanhe os números deste periódico no seu leitor de RSS

[1] * Corresponding author: <leandro.galon@uffs.edu.br>

Period	Development stage
Period	Beans	Black-jack	Southern crabgrass
1	3 trefoils	2 to 4 leaves	2 leaves to 1 tiller
2	8 trefoils	4 to 8 leaves	1 to 4 tiller

Herbicide dose (L ha^-1)	Application period	Phytotoxicity (%)
Herbicide dose (L ha^-1)	Application period	14 DAT⁽¹⁾	28 DAT	35 DAT
0.00	3 trefoils	0.0 a⁽²⁾	0.0 a	0.0 a
0.00	8 trefoils	0.0 a	0.0 a	0.0 a
1.25	3 trefoils	1.8 b	1.0 a	0.0 b
1.25	8 trefoils	4.8 a	1.0 a	1.0 a
1.50	3 trefoils	2.8 b	2.5 a	0.3 b
1.50	8 trefoils	7.0 a	1.8 a	1.8 a
1.75	3 trefoils	4.3 b	4.3 a	0.5 b
1.75	8 trefoils	9.5 a	2.8 a	2.8 a
2.00	3 trefoils	4.3 b	5.5 a	1.0 b
2.00	8 trefoils	11.8 a	4.3 a	4.3 a
Weeded contr.	3 trefoils	0.0 a	0.0 a	0.0 a
Weeded contr.	8 trefoils	0.0 a	0.0 a	0.0 a
General mean		3.83	1.91	0.95
VC (%)		32.86	59.64	50.48

Herbicide dose (g ha^-1)	Weed stage	Black-jack control (%)
Herbicide dose (g ha^-1)	Weed stage	14 DAT⁽¹⁾	28 DAT	35 DAT
0.00	2 to 4 leaves	0.0 a⁽²⁾	0.0 a	0.0 a
0.00	4 to 8 leaves	0.0 a	0.0 a	0.0 a
1.25	2 to 4 leaves	100.0 a	100.0 a	100.0 a
1.25	4 to 8 leaves	79.3 b	100.0 a	94.5 a
1.50	2 to 4 leaves	100.0 a	100.0 a	100.0 a
1.50	4 to 8 leaves	100.0 a	100.0 a	93.8 a
1.75	2 to 4 leaves	100.0 a	100.0 a	100.0 a
1.75	4 to 8 leaves	100.0 a	100.0 a	100.0 a
2.00	2 to 4 leaves	100.0 a	100.0 a	100.0 a
2.00	4 to 8 leaves	100.0 a	100.0 a	100.0 a
Weeded contr.	2 to 4 leaves	100.0 a	100.0 a	100.0 a
Weeded contr.	4 to 8 leaves	100.0 a	100.0 a	100.0 a
General mean		64.94	66.50	65.69
VC (%)		6.76	0.26	6.80

Herbicide dose (g ha^-1)	Weed stage	Southern crabgrass control (%)
Herbicide dose (g ha^-1)	Weed stage	14 DAT⁽¹⁾	28 DAT	35 DAT
0.00	2 leaves to 1 tiller	0.0 a⁽²⁾	0.0 a	0,0 a
0.00	1 to 4 tillers	0.0 a	0.0 a	0,0 a
1.25	2 leaves to 1 tiller	100.0 a	100.0 a	100,0 a
1.25	1 to 4 tillers	81.3 b	89.5 b	89,5 a
1.50	2 leaves to 1 tiller	91.3 a	100.0 a	100,0 a
1.50	1 to 4 tillers	88.8 a	100.0 a	100,0 a
1.75	2 leaves to 1 tiller	98.3 a	100.0 a	100,0 a
1.75	1 to 4 tillers	100.0 a	100.0 a	100,0 a
2.00	2 leaves to 1 tiller	99.5 a	100.0 a	100,0 a
2.00	1 to 4 tillers	100.0 a	100.0 a	94,5 a
Weeded control	2 leaves to 1 tiller	100.0 a	100.0 a	100,0 a
Weeded control	1 to 4 tillers	100.0 a	100.0 a	100,0 a
General mean		63.25	66.63	65.33
VC (%)		10.38	4.87	6.41

Herbicide dose (L ha^-1)	Herbicide application period	N. of pods per plant	N. of grains per pod	1,000-grain weight (g)	Grain yield (kg ha^-1)
0	3 trefoils	9.73 a⁽¹⁾	22.99 a	178.47 a	1942.44 a
0	8 trefoils	7.80 a	18.53 b	177.71 a	1759.41 b
1.25	3 trefoils	10.70 a	22.70 a	189.44 a	2124.61 a
1.25	8 trefoils	8.40 b	17.67 b	185.76 a	2113.33 a
1.50	3 trefoils	12.33 a	18.03 a	184.82 a	2303.52 a
1.50	8 trefoils	9.93 b	15.47 a	178.92 a	1811.55 b
1.75	3 trefoils	11.80 a	17.96 a	185.10 a	2184.88 a
1.75	8 trefoils	10.27 a	15.72 a	182.55 a	1697.54 b
2.00	3 trefoils	11.25 a	19.13 a	189.43 a	2213.68 a
2.00	8 trefoils	10.47 a	18.25 a	184.34 a	1975.00 b
Test. capinada	3 trefoils	10.50 a	18.09 a	188.61 a	2104.26 a
Test. capinada	8 trefoils	9.80 a	16.91 a	183.53 a	1988.89 b
General mean		10.25	18.45	184.06	2018.26
VC (%)		13.56	13.71	2.26	4.42

Herbicide dose (%)	Herbicide dose⁽¹⁾ (L ha^-1)	Active ingredient (g ha^-1)
100.0	2.00⁽²⁾	250.00 + 250.00
87.5	1.75	218.75 + 218.75
75.0	1.50	187.50 + 187.50
62.5	1.25	156.25 + 156.25
0.0	0.00	0.00

Treatment	Weed control
	Period 1	Period 2
	Black-jack - 2 to 4 leaves Southern crabgrass - 2 leaves to 1 tiller	Black-jack - 4 to 8 leaves Southern crabgrass - 1 to 4 tillers
Infested control treatment	1759.41 bA⁽²⁾	1759.41 bA
Herbicides⁽¹⁾ - 1,25 L ha^-1	2113.33 aA	2124.61 aA
Herbicides⁽¹⁾ - 2,00 L ha^-1	2213.68 aA	1975.00 aB
Weeded control treatment	2104.26 aA	1988.89 aA
General mean	2004.82
VC (%)	4.23