Weed Control and Peanut Tolerance with Ethalfluralin-Based Herbicide Systems

Table 2

Weed control, peanut yield, and grade with herbicide systems in south Texas which include ethalfluralin.^a,b

Treatments^c	Application timing	Yellow nutsedge	P. amaranth		Peanut
			2007	2008	Stunt	Yield	Grade^d
		%				Kg/ha	%
Nontreated	—	0	0	0	0	5100	73.2
Ethalfluralin	PPI	0	32	97	0	5670	73.5
Ethalfluralin fb imazethapyr	PPI fb MPOST	93	67	100	1	5720	72.4
Ethalfluralin fb imazapic	PPI fb MPOST	88	100	100	0	6220	73.0
Ethalfluralin fb imazapic/imazapic^e	PPI fb EPOST/MPOST	83	100	93	2	5590	73.0
Ethalfluralin fb bentazon	PPI fb MPOST	56	76	100	0	5500	73.1
Ethalfluralin fb acifluorfen	PPI fb MPOST	0	98	91	0	4850	73.1
Ethalfluralin fb lactofen	PPI fb MPOST	0	96	100	0	5650	73.6
Ethalfluralin fb 2,4-DB	PPI fb MPOST	0	93	100	4	4150	72.4
Ethalfluralin fb paraquat	PPI fb EPOST	23	92	94	19	3530	71.7
Ethalfluralin/S-metolachlor fb paraquat	PPI/PRE fb EPOST	75	100	100	33	4180	72.2
Ethalfluralin/flumioxazin	PPI/PRE	0	88	97	2	5090	74.0
Ethalfluralin/flumioxazin + S-metolachlor	PPI/PRE	37	99	100	0	5240	72.5
Ethalfluralin/S-metolachlor fb lactofen	PPI/PRE fb MPOST	72	100	100	5	5680	71.8
Ethalfluralin/flumioxazin + S-metolachlor fb lactofen	PPI/PRE fb MPOST	43	92	100	7	5350	73.6
LSD (0.05)		38	38	9	6	1140	2.0

^aYellow nutsedge present in 2008 and 2009. Peanut yield and grade obtained in 2008 and 2009. Data combined over years.
^bAbbreviations: fb: followed by; PPI: preplant incorporated; PRE: preemergence, EPOST: early postemergence, MPOST: mid-postemergence.
^cHerbicide rates: ethalfluralin, 0.84 kg/ha; imazethapyr, 0.07 kg/ha; imazapic, 0.07 kg/ha or the split rates of 0.035 kg/ha; bentazon, 1.12 kg/ha; acifluorfen, 0.42 kg/ha; lactofen, 0.22 kg/ha; 2,4-DB, 0.44 kg/ha; paraquat, 0.28 kg/ha; S-metolachlor, 1.1 kg/ha; flumioxazin, 0.11 kg/ha. EPOST treatments applied 3 to 4 wk after planting followed by MPOST treatment approximately 3 wk later. All POST treatments included Agridex at 0.6% v/v.
^dGrade, sound mature kernels (SMK) + sound splits (SS).
^eSplit application of imazapic. Initial application approximately 3 to 4 wk after planting followed by second application 3 wk later.