Roundup-resistant Canola Herbicide Trial, Carrington, 2000.
G. Endres, B. Henson and J. Schneider

The experiment was conducted on a minimum-till field with a Heimdahl-Emrick loam soil with 6.2 pH and 3.3% organic matter at the NDSU Carrington Research Extension Center. The experimental design was a randomized complete block with three replicates. Herbicide treatments were applied to 5 by 25 ft plots with a hand-boom plot sprayer. The PPI treatment was applied at 18.4 gal/A at 35 psi through 8002 flat fan nozzles on May 1 with 68 F, 24% RH, 90% clear sky, and 8 mph wind on a dry soil surface and incorporated with a roto-tiller at a 3- to 4-inch depth. ‘Hyola 357RR‘ canola was planted at 700,000 PLS/A on May 3 in 7-inch rows at a 0.5- to 1-inch depth.  POST treatments were applied at 9.2 gal/A at 35 psi through 8001 flat fan nozzles. POSTA treatments were applied on May 25 with 57 F, 55% RH, clear sky, and 9 mph wind to 1- to 2-leaf canola, 1- to 2-inch tall yellow and green foxtail, 1- to 5-inch tall common lambsquarters, 0.5-inch tall redroot and prostrate pigweed, and 1.5- to 4-inch tall wild buckwheat. POSTB treatments were applied on June 2 with 50 F, 77% RH, clear sky, and 8 mph wind to 3- to 4-leaf canola, 3- to 4-leaf foxtail, 1- to 5-inch tall common lambsquarters, 4- to 6-inch tall horseweed, 0.5- to 1-inch tall pigweed, and 2- to 6-inch tall wild buckwheat. POSTC treatments were applied on June 8 with 66 F, 69% RH, 80% cloudy sky, and 11 mph wind to 5- to 6-leaf canola, 5- to 6-leaf foxtail, 1- to 9-inch tall common lambsquarters, <12-inch tall horseweed, 1- to 2-inch tall pigweed, and 6- to 12-inch vine wild buckwheat. The trial was harvested with a plot combine on August 15.

 

 

 

 

Weed control

Canola

Herbicide

 

8-July

 

31-July

seed

Treatment1

Rate

Timing

 

Fota2

Colq

Howe

Piwe3

Wibw

 

Fota

Colq

Howe

Wibw

yield

 

lb/A

 

 

----------------------------------------- % ------------------------------------

lb/A

Glyt

0.375

POSTA

 

94

99

99

97

81

 

90

96

94

76

1104.6

Glyt

0.56

POSTA

 

98

98

92

98

86

 

89

94

99

89

1283.4

Glyt

0.375

POSTB

 

98

99

68

98

75

 

96

98

98

67

1175.2

Glyt

0.56

POSTB

 

99

99

94

99

75

 

96

94

98

82

1149.1

Glyt

0.75

POSTB

 

97

99

92

98

84

 

90

89

99

85

1257.3

Glyt

0.375

POSTC

 

99

82

99

97

68

 

94

87

98

73

1334.9

Glyt

0.56

POSTC

 

99

81

92

98

77

 

91

95

91

75

894.6

Glyt/Glyt

0.375/0.375

POSTA/C

 

95

99

99

99

85

 

91

99

99

86

1099.2

Glyt/Glyt

0.560/0.375

POSTA/C

 

99

99

99

99

96

 

97

99

99

96

1379.4

Glyt/Glyt

0.560/0.560

POSTA/C

 

98

99

99

99

92

 

96

99

99

95

1077.0

Glyt+Clpy

0.375+0.094

POSTB

 

98

99

99

99

86

 

93

98

99

78

1152.8

Trif/Qufp-P

0.75/0.068

PPI/POSTB

 

99

89

99

95

81

 

98

76

99

88

1351.4

untreated

 

 

 

0

0

0

0

0

 

0

0

0

0

797.9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LSD (0.05)

 

 

5

9

2

14

11

 

10

9

11

6

NS

1Glyphosate (Roundup Ultra) treatments include AMS at 1% v/v; Quizalofop treatment includes COC

(Herbimax) at 1% v/v.

2Fota=yellow and green foxtail.

 

 

 

 

 

 

 

 

 

 

 

 

3Piwe=Redroot and prostrate pigweed.

 

 

 

 

 

 

 

 

 

 

Green and yellow foxtail, horseweed, and redroot and prostrate pigweed control was > 90% with glyphosate at 0.38 lb/A among application timings . Common lambsquarters control with trifluralin was less than with POST treatments on July 31.  Common lambsquarters control was highest (96-99%) with glyphosate at 0.38 lb/A applied 22 or 30 days after planting compared to the late application. Wild buckwheat control on July 31 was highest (95-96%) with sequential applications of glyphosate at 0.560/0.375 and 0.560/0.560 lb/A. Canola injury was not detected with any treatment. Although not statistically significant, canola yield tended to improve with herbicide treatments compared to the untreated check.

 

NDSU Vice President,
Dean and Director for Agricultural Affairs
NDSU Extension Service ND Agricultural
Experiment Station
NDSU College of Agriculture NDSU College of Human Development and Education