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

Table 2

The above-ground dry weight reduction of ALS-resistant (AR1, AR2, and MS1) and -susceptible E. crus-galli populations at 21 d after treatment with various ALS-inhibiting herbicides at recommended field rates^a,b,c.

		Above-ground dry weight reduction
Treatment	Rate	Susceptible		AR1		AR2		MS1
	g ai ha^−1	% of nontreated control
Imazethapyr	70	100	aA	52	cA	24	dC	82	bA
Imazamox	35	100	aA	58	cA	22	dC	80	bA
Penoxsulam	35	99	aAB	21	cB	50	bB	22	cB
Bispyribac-sodium	30	99	aAB	19	bB	99	aA	25	bB

^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.