Table 1.

Growth reduction values and resistance ratios on dicamba, 2,4-D, and fluroxypyr

Herbicide	GR10* (±SE)	GR50† (±SE)	GR90‡ (±SE)	R/S§ (ED50)
Dicamba
R line	1,596 (323)	6,784 (439)	28,827 (5,752)	38
S line	14 (6)	179 (27)	2,230 (612)
2,4-D
R line	702 (122)	2,619 (272)	9,770 (2,227)	12
S line	29 (10)	220 (29)	1,655 (430)
Fluroxypyr
R line	72 (19)	1,057 (139)	15,583 (5,706)	13
S line	19 (5)	83 (7)	368 (73)

^*GR10 represents the effective dose in grams per hectare required to achieve 10% reduction in fresh weight compared with untreated control.

^†GR50 represents the effective dose in grams per hectare required to achieve 50% reduction in fresh weight compared with untreated control.

^‡GR90 represents the effective dose in grams per hectare required to achieve 90% reduction in fresh weight compared with untreated control.

^§R/S is the resistance ratio, and it is calculated by dividing the GR50 of the R line by the GR50 of the S line to determine the relative resistance in fold.