Weed Control and Peanut Tolerance with Ethalfluralin-Based Herbicide Systems

Table 1

Weed control in the Texas High Plains with herbicide systems which include ethalfluralin.^a

Treatments^b,c	Application timing	Devil’s claw		Palmer amaranth		Puncture vine
		2008	2009	2008	2009	2009
		%
Nontreated	—	0	0	0	0	0
Ethalfluralin	PPI	20	0	72	90	62
Ethalfluralin fb imazethapyr	PPI fb MPOST	90	50	73	94	83
Ethalfluralin fb imazapic	PPI fb MPOST	100	93	80	96	97
Ethalfluralin fb imazapic/imazapic^d	PPI fb EPOST/MPOST	98	98	85	97	92
Ethalfluralin fb bentazon	PPI fb MPOST	82	95	55	87	100
Ethalfluralin fb acifluorfen	PPI fb MPOST	10	88	60	96	52
Ethalfluralin fb lactofen	PPI fb MPOST	47	98	75	98	89
Ethalfluralin fb 2,4-DB	PPI fb MPOST	77	45	74	95	89
Ethalfluralin fb paraquat	PPI fb EPOST	7	33	55	96	39
Ethalfluralin/S-metolachlor fb paraquat	PPI/PRE fb EPOST	2	90	87	99	100
Ethalfluralin/flumioxazin	PPI/PRE	15	38	76	99	92
Ethalfluralin/flumioxazin + S-metolachlor	PPI/PRE	15	68	86	100	100
Ethalfluralin/S-metolachlor fb lactofen	PPI/PRE fb MPOST	50	100	78	99	95
Ethalfluralin/flumioxazin + S-metolachlor fb lactofen	PPI/PRE fb MPOST	63	100	88	100	89
LSD (0.05)		11	20	26	3	40

^aAbbreviations: fb: followed by; PPI: preplant incorporated; PRE: preemergence; EPOST: early postmemergence; MPOST: mid postemergence.
^bHerbicide 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.
^cPOST treatments of bentazon, acifluorfen, lactofen, 2,4-DB included Agridex at 1% v/v while POST treatments of imazapic, imazethapyr, or paraquat included Induce at 1% v/v. MPOST treatment approximately 3 wk after EPOST treatments.
^dSplit application of imazapic. Second application followed the initial application by 6 wk in 2008 and 2 wk in 2009.