Selective weed control in white oat cultivars with als-inhibiting herbicides

Xavier, Elouize; Trezzi, Michelangelo M.; Oliveira, Marisa de C.; Vidal, Ribas A.

doi:10.51694/AdvWeedSci/2022;40:00004

Brasil

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RESEARCH ARTICLE • Adv. Weed Sci. 40 • 2022 • https://doi.org/10.51694/AdvWeedSci/2022;40:00004 linkcopy

Selective weed control in white oat cultivars with als-inhibiting herbicides^** Corresponding author elouize.xav@gmail.com

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Background The limited number of selective herbicides for white oat (Avena sativa L.) cultivation makes it managing weeds a challenge. Currently, few herbicide options are available for selective weed control in winter crops. Previous studies have indicated that ALS-inhibiting herbicides could be potential alternatives, so studies were conducted.

Objective To characterize the tolerance level of white oat cultivars to ALS-inhibiting herbicides and to evaluate the level of weed control by applying penoxsulam and bispyribac-sodium.

Methods Tolerance (%) was determined for white oat cultivars UFRGS 14, URS Guará, URS Guria, UFRGS 18, and URS Taura for imazethapyr, iodosulfuron, penoxsulam, and bispyribac-sodium dose-response. Also, the control efficiency of different doses of penoxsulam and bispyribac-sodium was determined on weed species of white oat, namely crabgrass (Digitaria horizontalis), siberian motherwort (Leonurus sibiricus), italian ryegrass (Lolium multiflorum), and wild radish (Raphanus raphanistrum).

Results Imazethapyr and bispyribac-sodium were the least selective herbicides, whereas iodosulfuron had intermediate selectivity, and penoxsulam was the most selective for the white oat cultivars tested, with average control of 100, 72, 62.7 and 40%, respectively. Overall, bispyribac-sodium had a higher level of weed control (77.1%) than penoxsulam (62%). Label doses of penoxsulam and bispyribac-sodium resulted in low control levels of crabgrass.

Conclusions All doses of bispyribac-sodium effectively control wild radish and italian ryegrass. The recommended dose of penoxsulam was selective for some cultivars of white oat and effectively controlled italian ryegrass and wild radish.

Avena sativa L; acetolactate synthase; selectivity; triazolopyrimidine; pyrimidinylthiobenzoates

	Cultivars	Parameters¹
	Cultivars	a	b	X0(C ₅₀ **)	R ²	TF
Imazethapyr	UFRGS 14	100*	1.52 ^ns	<0.001 ^ns	0.99^ns	1.00
	URS Guará	100*	1.52 ^ns	<0.001 ^ns	0.99^ns	1.00
	URS Taura	100*	1.52 ^ns	<0.001 ^ns	0.99^ns	1.00
	URS Guria	100*	1.52 ^ns	<0.001 ^ns	0.99^ns	1.00
	UFRGS 18	100*	1.52 ^ns	<0.001 ^ns	0.99^ns	1.00
Iodosulfuron	UFRGS 14	100*	2.55 ^ns	7.70*	0.98*	2.17
	URS Guará	100*	1.50 ^ns	7.15 ^ns	0.94^ns	2.01
	URS Taura	100*	1.44 ^ns	5.15 ^ns	0.98*	1.45
	URS Guria	100*	1.27 ^ns	3.55 ^ns	0.99*	-
	UFRGS 18	100*	1.74 ^ns	3.80*	0.99*	1.07
Bispyribac-sodium	UFRGS 14	100*	27.88*	91.00*	0.99*	9.10
	URS Guará	100*	2.76*	116.00*	0.99*	11.60
	URS Taura	100 ^ns	63.95 ^ns	163.00 ^ns	0.92^ns	16.30
	URS Guria	100 ^ns	1.52 ^ns	10.00 ^ns	0.98^ns	-
	UFRGS 18	100*	1.14 ^ns	43.00 ^ns	0.98^ns	4.30
Penoxsulam	UFRGS 14	100*	2.38 ^ns	89.40*	0.99*	-
	URS Guará	100*	0.69 ^ns	324.00 ^ns	0.95^ns	3.62
	URS Taura	100*	0.63*	174.60*	0.99*	1.95
	URS Guria	100*	1.06 ^ns	183.00 ^ns	0.93^ns	2.05
	UFRGS 18	100*	0.75*	197.40*	0.99*	2.21

	Cultivars	Parameters¹
	Cultivars	a	b	X0 (GR ₅₀ **)	R ²	TF
Imazethapyr	UFRGS 14	100*	0.63 ^ns	66.00 ^ns	0.99^ns	660000
	UFRGS 18	100*	0.51 ^ns	8.00 ^ns	0.99^ns	80000
	URS Guará	100*	0.43 ^ns	2.00 ^ns	0.99^ns	2000
	URS Taura	100*	0.03 ^ns	<0.001 ^ns	0.99^ns	10
	URS Guria	100*	0.03 ^ns	<0.0001 ^ns	0.99^ns	-
Iodosulfuron	UFRGS 14	103*	1.78 ^ns	9.10 ^ns	0.92^ns	3.14
	UFRGS 18	100*	0.66*	4.50*	0.99*	1.55
	URS Guará	100*	0.77 ^ns	3.50 ^ns	0.96^ns	1.21
	URS Taura	100*	1.00*	3.55*	0.99*	1.22
	URS Guria	100*	0.65 ^ns	2.90 ^ns	0.94^ns	-
Bispyribac- sodium	UFRGS 14	100*	0.14 ^ns	0.94 ^ns	0.99^ns	940
	UFRGS 18	100*	0.51 ^ns	42.00 ^ns	0.99^ns	42000
	URS Guará	100*	0.40 ^ns	9.00 ^ns	0.99^ns	9000
	URS Taura	100*	0.09 ^ns	0.25 ^ns	0.99^ns	250
	URS Guria	100*	0.07 ^ns	<0.001 ^ns	0.99^ns	-
Penoxsulam	UFRGS 14	91*	2.89 ^ns	196.20 ^ns	0.92^ns	2.89
	UFRGS 18	101*	1.04 ^ns	129.00 ^ns	0.95^ns	1.90
	URS Guará	96*	1.73 ^ns	256.20*	0.98*	3,77
	URS Taura	100*	0.69 ^ns	155.40 ^ns	0.86^ns	2.29
	URS Guria	100*	0.78 ^ns	67.80 ^ns	0.98^ns	-

Control (%)
Herbicides	Weed species	Parameters¹
Herbicides	Weed species	a	b	X0(C ₅₀ **)	R ²
Penoxsulam	Italian ryegrass	100*	1.99*	4.20*	0.99*
	Crabgrass	95*	1.77*	96.00*	0.95*
	Siberian motherwort	98*	0.69*	14.40 ^ns	0.94*
	Wild radish	93*	1.29*	22.80*	0.95*
Bispyribac- sodium	Italian ryegrass	100 ^ns	1.11 ^ns	<0.0001 ^ns	0.99^ns
	Crabgrass	95*	1.73*	29.50*	0.99*
	Siberian motherwort	100*	34.8*	6.50*	0.99*
	Wild radish	100 ^ns	1.11 ^ns	<0.0001 ^ns	0.99 ^ns
Dry mass of the aerial part (%)
Herbicides	Weed species	Parameters¹
Herbicides	Weed species	a	b	X0(GR ₅₀ **)	R ²
Penoxsulam	Italian ryegrass	100*	1.69*	6.60*	0.99*
	Crabgrass	107*	0.94*	174.00*	0.86*
	Siberian motherwort	100*	0.62*	4.20*	0.94*
	Wild radish	93*	1.27*	22.20*	0.95*
Bispyribac- sodium	Italian ryegrass	100 ^ns	1.11 ^ns	<0.0001 ^ns	0.99^ns
	Crabgrass	96*	1.34*	77.50*	0.91*
	Siberian motherwort	100*	1.05*	5.00*	0.99*
	Wild radish	100 ^ns	1.11 ^ns	<0.0001 ^ns	0.99^ns

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[TFN1] ¹ Equation of the three-parameter logistic model Y= a/(1+(x/X0)^b): a= maximum asymptote, b= curve slope. **C₅₀= Dose (g a.i. ha^-1) providing 50% control. TF (Tolerance Factor) = C₅₀ tolerant/ C₅₀ susceptible.

[TFN2] *Significance by the t-test at 5% probability of error; ^ns non-significant.

Selective weed control in white oat cultivars with als-inhibiting herbicides** Corresponding author elouize.xav@gmail.com

Abstract

Selective weed control in white oat cultivars with als-inhibiting herbicides^** Corresponding author elouize.xav@gmail.com