Title

Metribuzin and Sulfentrazone for Preemergence Weed Control in Field Pea at Hettinger, ND, 2025.

(Research Report, Hettinger REC, December 2025)

File

Publication File:

Summary

A trial was conducted to evaluated the use of metribuzin and sulfentrazone for weed control and for tolerance in field pea. Field pea were planted on May 7, 2025 and herbicide treatments were applied on May 9. Field pea emerged on May 19. Rainfall measuring 4.17 inches fell during the time between planting and pea emergence. Kochia, wild buckwheat, and common mallow were evaluated for weed control 32 and 49 days after treatment (DAT). Kochia control was above 90% with all herbicide treatments 32 DAT, but tended to increase with herbicide rate, especially for combinations of metribuzin and sulfentrazone. At 49 DAT, 4oz/A of metribuzin resulted in 87% control of kochia, which was the lowest level of control observed. The highest level of control was with the combination of metribuzin (8 oz/A) and sulfentrazone (6.75 lb/A). This combination also resulted in the best control of wild buckwheat and common mallow.

Lead Author

Lead Author:

Caleb Dalley

Availability

Availability:

Web only

Publication Sections

Table 1. Evaluation of weed control from preemergence application of metribuzin and sulfentrazone in field pea.

Treatment^a		Rate	Kochia				Wild buckwheat				Common mallow
			32 DAT		49 DAT		32 DAT		49 DAT		32 DAT		49 DAT
		oz/A	–––––––––––––––––––––– % control ––––––––––––––––––––––––––
1	Untreated		0	d	0	e	0	i	0	e	0	h	0	g
2	Metribuzin	4	93	bc	87	d	83	h	68	d	79	g	65	f
3	Metribuzin	6	96	abc	88	d	89	fg	73	d	87	ef	75	e
4	Metribuzin	8	97	abc	90	bcd	92	de	84	c	91	cde	84	d
5	Spartan	3.75	93	abc	90	cd	86	gh	71	d	85	f	72	e
6	Spartan	5.25	91	c	88	d	91	ef	81	c	88	def	76	e
7	Spartan	6.75	96	abc	90	cd	98	abc	83	c	87	f	83	d
8	Metribuzin	4	99	a	94	a-d	95	bcd	83	c	87	ef	82	d
	Spartan	3.75
9	Metribuzin	4	95	abc	90	cd	94	cde	86	bc	92	bcd	85	cd
	Spartan	5.25
10	Metribuzin	4	97	abc	97	abc	96	abc	92	ab	96	ab	90	bc
	Spartan	6.75
11	Metribuzin	6	98	ab	94	a-d	95	bcd	83	c	96	abc	85	cd
	Spartan	3.75
12	Metribuzin	6	94	abc	96	abc	99	a	93	ab	96	ab	91	b
	Spartan	5.25
13	Metribuzin	6	96	abc	92	a-d	97	abc	92	ab	99	a	94	ab
	Spartan	6.75
14	Metribuzin	8	97	ab	98	ab	96	abc	86	bc	96	ab	91	b
	Spartan	3.75
15	Metribuzin	8	95	abc	98	ab	97	abc	93	a	96	ab	93	ab
	Spartan	5.25
16	Metribuzin	8	99	a	99	a	98	ab	96	a	99	a	98	a
	Spartan	6.75
LSD P=.05			5.8		8.2		3.4		6.6		4.5		4.8
Standard Deviation			4.9		6.9		2.8		5.5		3.8		4.0
CV			14.48		5.49		7.97		7.02		4.42		5.13
Treatment F			20.413		95.227		46.089		66.549		154.570		126.843
Treatment Prob(F)			0.0001		0.0001		0.0001		0.0001		0.0001		0.0001

Table 2. Evaluation of field pea tolerance to preemergence application of metribuzin and sulfentrazone.

Treatment^a		Rate	Injury		Stand count		Pea height		Pea yield
			32 DAT		33 DAT		48 DAT
		oz/A	%		plants/A		inches		lb/A
1	Untreated		0	c	278,000	g	11.9	-	2594	-
2	Metribuzin	4	0	c	338,000	abc	11.9	-	2693	-
3	Metribuzin	6	0	c	340,000	abc	12.1	-	2784	-
4	Metribuzin	8	0	c	317,000	a-f	12.2	-	2900	-
5	Spartan	3.75	0	c	289,000	efg	11.8	-	2760	-
6	Spartan	5.25	0	c	352,000	a	11.8	-	2866	-
7	Spartan	6.75	0	c	331,000	a-d	11.6	-	2885	-
8	Metribuzin	4	0	c	305,000	c-g	11.6	-	2735	-
	Spartan	3.75
9	Metribuzin	4	0	c	280,000	fg	11.9	-	2737	-
	Spartan	5.25
10	Metribuzin	4	0	c
	Spartan	6.75			318,000	a-f	11.8	-	2899	-
11	Metribuzin	6	0	c
	Spartan	3.75
12	Metribuzin	6	0	c	334,000	a-d	12.1	-	3067	-
	Spartan	5.25
13	Metribuzin	6	1	c
	Spartan	6.75			351,000	ab	11.6	-	2986	-
14	Metribuzin	8	4	b
	Spartan	3.75
15	Metribuzin	8	3	b	298,000	d-g	12.1	-	2985	-
	Spartan	5.25
16	Metribuzin	8	9	a	314,000	b-g	11.5	-	2803	-
	Spartan	6.75
LSD P=.05			1.3		37433.9		0.53		283.9
Standard Deviation			1.1		31522.4		0.44		239.1
CV			99.78		9.92		3.75		8.45
Treatment F			20.413		2.138		1.178		1.051
Treatment Prob(F)			0.0001		0.0252		0.3228		0.4252

Application Description		Application equipment
Date	May-9-2025	Equipment Type	Tractor mounted
Start, Stop Time	2:48, 3:30 PM	Operation Pressure	42 PSI
Air Temperature Start, Stop	82.2, 77.4 F	Nozzle Model	11002DG
% Relative Humidity Start, Stop	24.9, 24.1	Nozzle Spacing	20 IN
Wind Velocity+Dir.	5.1 MPH, WNW	Boom Height	22.0 IN
Wind Velocity+Dir. Max	13.0 MPH, WNW	Ground Speed	4 MPH
Soil Temperature	43 F	Application Amount	10 GAL/AC

Metribuzin and Sulfentrazone for Preemergence Weed Control in Field Pea at Hettinger, ND, 2025.

Table 1. Evaluation of weed control from preemergence application of metribuzin and sulfentrazone in field pea.

Table 2. Evaluation of field pea tolerance to preemergence application of metribuzin and sulfentrazone.

Table 3. Application environment and equipment for preemergence application in peas.

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