Effective Pre-emergence Management of Winter Annual Grasses

Practices:

      1. What is your planting depth?
        • Planting depth should be 1-2″ seeding depth under the firm-like soil
      2. When setting the drill: Press the soil down within the drilled furrow to determine the true seeding depth (view photos below)
      3. The goal placement of 1-2″ for pre-emergence herbicides (such as ZiduaTM and Anthem flexTM)
      4. Applications of pre-emergence grassy weed control herbicides should be prior to the precipitation event
        • Otherwise, pre-emergence control can be lower due to germinating weed seedlings
      5. If seeded deeper than 2″ or shallower than 1″, the application needs to be made post-emergent to wheat for crop safety
      6. Under higher residue conditions, make sure residue is spread out and not lying in windows.

Photos courtesy of BASF.

Pressing down on firm-like soil.
Measuring soil depth with a Zidua ruler.
Downy Brome Control %
Treatment Fall applied Spring applied Fall vs Spring 
2 oz PowerFlex HL 90% 28%  63% increase
0.9 oz Olympus + 3.0 oz Metribuzin 80% 18% 63% increase
0.9 oz Olympus 71% 45% 26% increase
0.67 oz OutRider 69% 31% 38% increase
6 oz Metribuzin 51% 19% 32% increase
3 oz Metribuzin 39%
CHECK 0% 0%
Weed Pre-emergence Weed Post-emergence
% Brome control Product Rate (oz/a) Product Rate (oz/a)
98 A Zidua 1.50 Powerflex HL

+ M90 + UAN 32

2.0

0.25% + 2 qt

85 ab Anthem Flex 3.50 Osprey +

+ M90 + UAN 32

4.75

0.50% + 2 qt

84 ab Powerflex HL

+ M90 + UAN 32

2.0

0.25% + 2 qt

81 ab Zidua 1.50 Osprey +

+ M90 + UAN 32

4.75

0.50% + 2 qt

74 bc Axiom DF 10.00 Osprey +

+ M90 + UAN 32

4.75

0.50% + 2 qt

67 bc Anthem Flex 3.50
60 c Zidua 1.75
60 c Zidua 1.50 Outrider

+ M90

0.66

0.25%

56 c Zidua 1.95
55 c Zidua 1.50
43 d Axiom DF 10.00
43 d Osprey +

+ M90 + UAN 32

4.75

0.50% + 2 qt

26 e Olympus

+ M90

0.9

0.50%

19 ef Outrider

+ M90

0.66

0.25%

0 f Untreated
0 f Untreated

Washington State University