Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides

Table 1

Control of E. crus-galli populations at 21 d after treatment with various ALS herbicides at recommended field rates^a,b,c.

		Control
Treatment	Rate	Susceptible		AR1		AR2		MS1
	g ai ha^−1	%
Imazethapyr	70	100	aA	57	cA	6	dC	83	bA
Imazamox	35	100	aA	59	cA	6	dC	86	bA
Penoxsulam	35	99	aAB	26	cB	51	bB	22	cB
Bispyribac-sodium	30	98	aB	15	bC	98	aA	16	bC

^aMeans for each population within a column followed by the same uppercase letters and means for each herbicide within a row followed by the same lowercase letters are not significantly different according to Fisher’s protected LSD test (𝛼=0.05).
^bAll herbicide treatments except bispyribac-sodium contained nonionic surfactant at 0.25% v/v.
^cBispyribac-sodium treatments contained a nonionic spray adjuvant and deposition aid at 2.5% v/v.