Herbicide

Application timing

Rate

Giant ragweed control after burndown treatments^a,b,c

Giant ragweed control after POST herbicide treatments^a,b,c

7 DABT

14 DABT

21 DABT

7 DAPOST

30 DAPOST

At harvest

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Nontreated Control^d

-

-

0

0

0

0

0

0

Glyphosate fb Glyphosate

Burndown POST

870 870

36 d

54 b

56 b

43 c

46 b

10 c

2,4-D Amine fb Glyphosate

Burndown POST

560 870

63 b

87 a

92 a

93 a

92 a

89 ab

2,4-D Amine + Glyphosate fb Saflufenacil + Imazethapyr

Burndown PRE

560 + 870 95

64 b

98 a

99 a

99 a

99 a

99 a

Saflufenacil + Imazethapyr +

Glyphosate

Burndown

95 + 870

93 a

94 a

89 a

85 a

68 b

63 b

2,4-D Amine + Glyphosate fb S-metolachlor + Metribuzin

Burndown PRE

560 + 870 2050

66 b

98 a

99 a

99 a

99 a

99 a

S-metolachlor + Metribuzin +

Glyphosate

Burndown

2050 + 870

28 d

48 b

51 b

41 c

23 c

5 c

2,4-D Amine + Glyphosate fb Sulfentrazone + Cloransulam

Burndown PRE

560 + 870 294

64 b

94 a

99 a

99 a

97 a

96 a

Sulfentrazone + Cloransulam +

Glyphosate

Burndown

294 + 870

51 c

64 b

65 b

50c

47 b

25 c

2,4-D Amine + Glyphosate fb Cloransulam + Acetochlor

Burndown POST

560 + 870 17.7 + 1600

64 b

86 a

87 a

85 a

89 a

87 ab

2,4-D Amine + Glyphosate fb Chlorimuron + Acetochlor

Burndown POST

560 + 870 5.8 + 1600

65 b

92 a

95 a

97 a

93 a

90 ab

2,4-D Amine + Glyphosate fb Imazethapyr + Acetochlor

Burndown POST

560 + 870 70 + 1600

65 b

94 a

96 a

96 a

95 a

95 a

2,4-D Amine + Glyphosate fb Lactofen + Acetochlor

Burndown POST

560 + 870 220 + 1600

65 b

94 a

93 a

97 a

90 a

89 ab

2,4-D Amine + Glyphosate fb Fomesafen + Acetochlor

Burndown POST

560 + 870 264 + 1600

65 b

91 a

92 a

94 a

95 a

94 a

P-value

<0.0001

<0.0001

<0.0001

<0.0001

<0.0001

<0.0001