Reduced Wild Oats - 2001 Crops Day

2001 Reduced Rates and Application Timing of Wild Oat Herbicides at Hettinger.

App. Timing

Treatment

Product Rate

Wild Oat Rate Basis

Wild Oat Control

HRSW

oz/acre

%

1 leaf

Puma

10.6

Full

2

1 leaf

Puma

7.9

3/4

0

1 leaf

Puma

5.3

1/2

2

3 leaf

Puma

10.6

Full

72

3 leaf

Puma

7.9

3/4

59

3 leaf

Puma

5.3

1/2

25

5 leaf

Puma

10.6

Full

92

5 leaf

Puma

7.9

3/4

82

5 leaf

Puma

5.3

1/2

62

1 leaf

Everest + NIS*

0.60 + 0.25%

Full

40

1 leaf

Everest + NIS

0.45 + 0.25%

3/4

31

1 leaf

Everest + NIS

0.30 + 0.25%

1/2

25

3 leaf

Everest + NIS

0.60 + 0.25%

Full

90

3 leaf

Everest + NIS

0.45 + 0.25%

3/4

89

3 leaf

Everest + NIS

0.30 + 0.25%

1/2

88

5 leaf

Everest + NIS

0.60 + 0.25%

Full

62

5 leaf

Everest + NIS

0.45 + 0.25%

3/4

84

5 leaf

Everest + NIS

0.30 + 0.25%

1/2

72

1 leaf

Discover + DSV*

3.20 + 12.8

Full

10

1 leaf

Discover + DSV

2.40 + 12.8

3/4

18

1 leaf

Discover + DSV

1.60 + 12.8

1/2

1

3 leaf

Discover + DSV

3.20 + 12.8

Full

90

3 leaf

Discover + DSV

2.40 + 12.8

3/4

90

3 leaf

Discover + DSV

1.60 + 12.8

1/2

86

5 leaf

Discover + DSV

3.20 + 12.8

Full

95

5 leaf

Discover + DSV

2.40 + 12.8

3/4

95

5 leaf

Discover + DSV

1.60 + 12.8

1/2

92

1 leaf

Achieve + SC*+ AMS*

7.0 + 0.5% + 1%

Full

12

1 leaf

Achieve + SC+ AMS

5.25 + 0.5% + 1%

3/4

2

1 leaf

Achieve + SC+ AMS

3.50 + 0.5% + 1%

1/2

6

3 leaf

Achieve + SC+ AMS

7.0 + 0.5% + 1%

Full

71

3 leaf

Achieve + SC+ AMS

5.25 + 0.5% + 1%

3/4

84

3 leaf

Achieve + SC+ AMS

3.50 + 0.5% + 1%

1/2

75

5 leaf

Achieve + SC+ AMS

7.0 + 0.5% + 1%

Full

81

5 leaf

Achieve + SC+ AMS

5.25 + 0.5% + 1%

3/4

89

5 leaf

Achieve + SC+ AMS

3.50 + 0.5% + 1%

1/2

52

C.V. %

32.9

LSD 5%

25

# of Reps

4

*NIS=non ionic surfactant, DSV adjuvant, SC=super charge, AMS=ammonium sulfate.

2001 Reduced Rates and Application Timing of Wild Oat Herbicides at Hettinger. (Eriksmoen) The objective of this trial was to look at the relationship between various rates of wild oat herbicides applied at 3 different growth stages of HRSW. Reeder HRSW was planted on April 26. The first post-applied treatments were applied to 1 leaf wheat and to 1 leaf wild oats on May 8 with 65 deg. F, 26% RH, sunny sky and 10 mph wind. The second post-applied treatments were applied to 3 leaf wheat and to 1 to 3 leaf wild oats on May 17 with 44 deg. F, 53% RH, sunny sky and 12 mph wind. The third post-applied treatments were applied to 5 leaf wheat and to 2 to 5 leaf wild oats on June 11 with 63 deg. F, 44% RH, sunny sky and 5 mph wind. All treatments were applied with a tractor mounted CO2 propelled plot sprayer delivering 17 gpa at 40 psi through 8001 flat fan nozzles to a 5 foot wide area the length of 10 by 22 foot plots. The trial was sprayed with 10 ounces/Ac Starane + 1 pint/Ac Buctril + 1/3 ounce/Ac Express on June 7 to control broadleaf weeds. The experiment was a randomized complete block design with four replications. Wild oat populations were 8 plants per sq. foot on May 8, 38 plants per sq. foot on May 17 and 44 plants per sq. foot on June 11. Evaluations for wild oat control were on June 12 for the first two application dates and on July 3 for the third application date. The trial sustained severe hail damage on June 18 and was not harvested.

Summary

Crop injury was not observed on any treatment (data not shown). All treatments applied at the one leaf growth stage provided poor season long wild oat control, although there does appear to be some residual control with the Everest treatments. Wild oats at the first application were still emerging and the crop did not provide much competition. Wild oat control with Puma treatments tended to increase with the higher rates and later applications. Everest treatments were very effective at controlling wild oats at all treatment rates when applied at the 3 leaf stage. Everest treatments were less effective when applied at the 5 leaf stage than at the 3 leaf stage. Discover treatments provided excellent wild oat control at all three treatment rates when applied at the 3 and 5 leaf stages. The 5.25 ounce per acre rate of Achieve had better wild oat control (although not significantly) than the 7 ounce per acre rate when applied at the 3 and 5 leaf stages. The trial sustained severe hail damage on June 18 and was not harvested.

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