Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Table 2

Effect of ACCase-inhibiting herbicide and growth stage at time of application on relative biomass of barnyardgrass, broadleaf signalgrass, fall panicum, and Amazon sprangletop at 21 DAT.

Grass size	Herbicide	Rate	Biomass
			ECHCG	BRAPP	PANDI	LEFPA
		g ai ha^−1	% of untreated check
2- to 3-leaf	Quizalofop	80	5 e	7 e	4 d	4 f
	Quizalofop	120	7 e	6 e	3 d	3 f
	Quizalofop	160	5 e	4 e	3 d	3 f
	Fenoxaprop	122	8 e	6 e	4 d	5 f
	Cyhalofop	313	8 e	7 e	6 d	4 f
5- to 6-leaf	Quizalofop	80	7 e	8 e	4 d	7 ef
	Quizalofop	120	8 e	7 e	5 d	5 f
	Quizalofop	160	6 e	7 e	4 d	4 f
	Fenoxaprop	122	9 e	20 d	20 c	16 de
	Cyhalofop	313	43 d	41 c	63 a	60 a
12- to 16-leaf	Quizalofop	80	61 bc	57 ab	20 c	27 c
	Quizalofop	120	58 c	51 bc	19 c	27 c
	Quizalofop	160	55 c	22 d	18 c	22 cd
	Fenoxaprop	122	67 b	65 a	39 b	44 b
	Cyhalofop	313	84 a	62 ab	69 a	67 a

DAT: days after treatment, ECHCG: barnyardgrass, BRAPP: broadleaf signalgrass, PANDI: fall panicum, LEFPA: Amazon sprangletop. Means within a column followed by the same letter are not different according to Fisher’s protected LSD (). Data expressed as percent relative biomass compared with nontreated control for each grass species and growth stage. Nontreated check was harvested on the same day as treated plots.