Management of winter weeds in winter wheat

Winter Weed Pressure in Winter Wheat
Edward Davis
Montana State University
Bozeman, Montana
Downy Brome
Feral Rye
Japanese Brome
Jointed
Goatgrass
Winter Annual Grass Weeds
- Herbicide Options
- Field Trials
Fumatory
Corn Gromwell
Winter Annual Broadleaf
Weeds
- Herbicide Options
- Field Trials
Blue Mustard
Tansy
Mustard
Prickly
Lettuce
Field
Pennycress
Herbicides for Brome Control in Winter Wheat
•
•
•
•
•
•
•
Maverick
Olympus
Osprey
PrePare/Everest
PowerFlex
Beyond
Far-Go
Group 2
Group 2
Group 2
Group 2
Group 2
Group 2
Group 8
Japanese Brome Biotype Response to
9 oz/A Olympus, 2WAT Dr. Dallas Peterson
Kansas State University
Susceptible
Biotype
Resistant
Biotype
Untreated
Dr. Dallas Peterson
Kansas State University
Bromus biotype responses to ALS herbicides at 2 WAT
Herbicide
Olympus
Olympus
Maverick
Beyond
PowerFlex
LSD (5%)
Japanese Brome
Cheat Population
Population
Rate
Susc.
Res.
Susc.
Res.
(oz/A)
------------(% control)-----------0.9
9
0.67
4
3.56
93
96
92
94
86
3
3
0
65
0
96
97
93
94
89
4
0
0
0
40
0
Dr. Dallas Peterson
Kansas State University
Bromus Biotype Response to ALS Herbicides
R - Cheat
S - Cheat
R - J. Brome
S - J. Brome
Olympus
0.9 oz
Olympus
9 oz
Maverick Beyond PowerFlex
0.67 oz
4 oz
3.5 oz
Check
PowerFlex
Untreated
Nov 2, 2007
CROP
0
1
3
Wheat
**
**
*
9
12
18
Barley
***
*
*
Oats
***
Canola
*
*
Lentil
*
*
Millet
4
5
**
Dry bean
*
PowerFlex
24
**
*
**
**
*
*
*
**
**
*
*
*
Flax
**
*
**
*
**
*
**
*
*
Sugar beets
Sorghum
Potato
Sunflower
OlympusFlex
Olympus
Beyond
PrePare
Maverick (Field
Bioassay)
*
**
*
Pea
Safflower
*
**
***
*
*
Chickpea
*
Mustard
*
*
*
*
Alfalfa
Buckwheat
*
26
**
Corn
Soybean
22
*
*
*
**
*
BARLEY
CAMELINA
PowerFlex
OAT
ROTATIONAL CROP
TOLERANCE TRIAL
Three Forks, Montana
Edward Davis
LENTIL
CANOLA
PEA
Three Forks, Montana
• 12-14 inch annual precipitation
• Silt Loam soil
– pH 8.2
– O.M. 1.4
• Alternate Crop/Fallow Cereal Grains
• Yield 2007 44 bu/acre
Three Forks, Montana
• “Willow Creek” Spring Wheat
• Planted September 29, 2006
• Sprayed May 16, 2007
– PowerFlex 3.5, 7, 14 oz/acre (1x,2x,4x)
– Maverick 0.66, 1.32 oz/acre (1x,2x)
– Olympus 0.9, 1.8 oz/acre (1x,2x)
Willow Creek Spring Wheat Yield
Rotational Crops 2008
• Planted April 17, 2008
– Lentil, Chickpea, Safflower, Pea, Camelina, Flax
POWERFLEX ROTATIONAL CROP TOLERANCE
LENTIL CHICKPEA SAFFLOWER PEA
CAMELINA
FLAX
POWERFLEX 3.5 OZ/A
0
0
0
0
0
0
POWERFLEX 7 OZ/A
0
0
0
0
0
0
POWERFLEX 14 OZ/A
4
0
0
0
0
0
MAVERICK 0.66 OZ/A
81
86
53
72
84
72
MAVERICK 1.32 OZ/A
93
93
82
81
95
80
OLYMPUS 0.9 OZ/A
42
28
3
10
9
40
OLYMPUS 1.8 OZ/A
67
56
3
28
37
52
8
9
11
9
17
12
LSD (P=.05)
FLAX
CAMELINA
PowerFlex 2X
Maverick 1X
Maverick 2X
PowerFlex 1X
PEA
??? To Split or not to Split Herbicide
Applications for Downy Brome Control in
Winter Wheat???
Maverick 2/3 oz Fall
Maverick 3/8 oz Fall Followed by 3/8 oz
Late Fall
Maverick 3/8 oz Fall Followed by 3/8 oz
Early Spring
Maverick 2/3 oz Early Spring
To Split ??? or not to Split ??? Herbicide
Applications for Downy Brome Control in
Winter Wheat???
Split applications of Maverick at 2/3 oz applied with a
fall-fall timing or a fall-spring timing produced downy
brome control equivalent to a full 2/3 oz application of
Maverick in the fall.
Full rate in the fall or splits produced superior downy
brome control compared to a full rate applied in the
spring
Full Rate Sequential Applications of Bayer
CropScience Herbicides for Downy Brome
Control in Winter Wheat
Fall Olympus
Spring OlympusFlex
Fall Olympus followed by spring OlympusFlex
Full Rate Sequential Applications of Bayer
CropScience Herbicides for Downy Brome
Control in Winter Wheat
Sequential applications of full rates of Olympus in the
fall followed by full rates of OlympusFlex or Osprey in
the spring improved downy brome control compared
to single full rate applications of Olympus in the fall or
OlympusFlex in the spring
However, winter wheat grain yield was not increased
in response to improved brome control
Timing of Flucarbazone Applications for
Downy Brome Control in Winter Wheat
PrePare Herbicide
Sept. 27
Preplant Applications
Photo Nov 5
Fall Preplant Burndown
Application with Roundup +
PrePare Applied Sept. 27
Photo Nov 5
Fall Postemergence
Applications
UNTREATED
Preplant Applications
Postplant Applications
.3 oz
Pre Oct 20
Fall Post Nov 2
Spr Post April 9
Grass Weeds In Wheat
WWW.jointedgoatgrass.org
National Jointed Goatgrass
Research Program
Clearfield Production System
Norris CL
Winter Wheat
Olympus 0.9 oz
OlympusFlex 3.5 oz
Osprey 4.75 oz
Olympus 0.9 oz
OlympusFlex 3.5 oz
Osprey 4.75 oz
Adjuvant system with
ClearMax:
MSO 1% v/v = 0.8 pt/A
Feral Rye Control in
Clearfield Winter
Wheat Production
System with 2-gene
Clearfield trait +
MSO Adjuvant
System
Oregon State University
Imazamox will control feral rye if applied
before the weed is tillering, usually in early
fall. In research conducted in eastern Oregon,
90 percent of the feral rye was controlled
when imazamox was applied when the weed
had one to six leaves. Late-fall (one- to fivetiller feral rye) and spring applications
provided 35 and 60 percent control,
respectively.
Fumatory
Corn Gromwell
Winter Annual Broadleaf
Weeds
- Herbicide Options
- Field Trials
Blue Mustard
Tansy
Mustard
Prickly
Lettuce
Field
Pennycress
3.5 oz
Belgrade, Montana
PowerFlex
Untreated
3.5 oz
Moccasin, Montana
Downy Brome
Corn Gromwell
Moccasin, Montana
PowerFlex
Fumatory
(Fumaria officinalis)
% Control of Fumatory
Herbicide Treatment
1 Week
3 Week
6 Week
Huskie
11oz
51
75
64
Huskie
15 oz
65
82
77
Huskie
Ally
11 oz
.1 oz
58
50
53
Ally
.1 oz
43
16
16
Orion
17 oz
69
34
16
Starane NXT
14 oz
49
44
54
Starane NXT
21 oz
59
64
72
Bronate Advanced 12.8 oz
78
50
43
Winter Annual Broadleaf Weed Control in Winter Wheat with Huskie Herbicide
Treatment Product
Rate
Prickly
Lettuce
Purple
Field
Mustard Pennycress
Huskie
R-11
AMS
11 oz/a
0.5 % v/v
0.5 lb/a
100
100
100
Huskie
R-11
AMS
13.5oz/a
0.5 % v/v
0.5 lb/a
100
100
100
Huskie
R-11
UAN 32%
11 oz/a
0.5 % v/v
2 qt/a
100
100
100
100
100
100
100
100
100
Huskie
11
MCPA Ester12
R-11
0.5
UAN 32% 2
Huskie
AMS
oz/a
oz/a
% v/v
qt/a
11 oz/a
0.5 lb/a
THANKS
Questions?
Comments!