control of downy brome in grass grown for seed
DESCRIPTION
Control of Downy brome in grass grown for seed. Daniel A. Ball, CBARC Sandra M. Frost. Bromus tectorum L. Mediterranean Aggressive winter annual weed Spring forage Problem in winter wheat and perennial grass. Bromus tectorum L. Fine hairs on leaves Panicle dense, slender - PowerPoint PPT PresentationTRANSCRIPT
Control of Downy bromein grass grown for seed
Daniel A. Ball, CBARC
Sandra M. Frost
Bromus tectorum L.
Mediterranean
Aggressive winter annual weed
Spring forage
Problem in winter wheat and perennial grass
Bromus tectorum L.
• Fine hairs on leaves
• Panicle dense, slender
• Seeds narrow with awns
Bromus tectorum L.
• Annual precip 6 to 22 inches
• Many soil conditions and habitat types
• Seed germinates late summer
• Seed mature after 1800 GDD (base 32F)
• Seeds viable in soil 2 to 3 years
Labeled for Downy brome
• Outlook (6EC) at 14 to 21 oz product / A– Dimethenamid
• Sencor 75DF at 0.5 lb/A (75W)– metribuzin
• On established, dormant grasses
Cultural control
• Crop rotation
• Moldboard plow
• Tillage before seed emergence– 1800 GDD, base 32F
• Pre-plant control– Tillage– Herbicides – Roundup
CRP tolerance trial
• Established stand seeded 9/2000
• PRE applications 9/2001
Herbicides
Herbicide Timing Weeds
Prowl PRE Foxtails
Outlook PRE Foxtails + Downy brome
Dual Magnum PRE Suppresses Downy brome
Axiom PRE Foxtails
Sencor 75DF PRE Suppresses Downy brome
Prowl + Outlook PRE Downy brome
Plateau + MSO POST Downy brome
Timothy tolerance
Timothy
Treatment Prod/A 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt 3 1 1
Outlook 1 pt 11 3 14
Dual Magnum 1 pt 4 1 3
Axiom 9 oz 54 15 3
Sencor 75DF 5 oz 78 53 25
Prowl + Outlook 5 pt + 1 pt 20 3 4
LSD (0.05) 19 15 18
Thickspike wg tolerance
Thickspike wheatgrass
Treatment Prod/A 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt 3 0 0
Outlook 1 pt 8 1 0
Dual Magnum 1 pt 3 3 0
Axiom 9 oz 43 9 3
Sencor 75DF 5 oz 40 5 0
Prowl + Outlook 5 pt + 1 pt 13 5 8
LSD (0.05) 17 7 8
Bluebunch tolerance
Bluebunch wheatgrass
Treatment Prod/A 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt 1 1 0
Outlook 1 pt 1 1 0
Dual Magnum 1 pt 0 1 0
Axiom 9 oz 24 5 0
Sencor 75DF 5 oz 38 4 0
Prowl + Outlook 5 pt + 1 pt 6 0 0
LSD (0.05) 10 5 0
Sandberg tolerance
Sandberg bluegrass
Treatment Prod/A 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt 0 3 0
Outlook 1 pt 4 0 0
Dual Magnum 1 pt 3 0 0
Axiom 9 oz 8 0 0
Sencor 75DF 5 oz 20 0 0
Prowl + Outlook 5 pt + 1 pt 4 0 0
LSD (0.05) 6 3 0
Big bluegrass tolerance
Big bluegrass
Treatment Prod/A 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt 1 0 0
Outlook 1 pt 5 0 0
Dual Magnum 1 pt 1 3 0
Axiom 9 oz 23 4 0
Sencor 75DF 5 oz 54 1 0
Prowl + Outlook 5 pt + 1 pt 6 0 0
LSD (0.05) 13 5 0
Sheep fescue tolerance
Sheep fescue
Treatment Prod/A 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt 1 1 0
Outlook 1 pt 18 1 5
Dual Magnum 1 pt 14 1 11
Axiom 9 oz 83 1 31
Sencor 75DF 5 oz 93 4 0
Prowl + Outlook 5 pt + 1 pt 20 5 14
LSD (0.05) 12 6 10
CRP tolerance trial
• Established stand seeded 2000
• Applications made– PRE 9/2001– POST 11/2001
Timothy tolerance
Timothy
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
-----------% injury---------------
Prowl 5 pt PRE 1 1 15
Outlook 1 pt PRE 10 0 15
Dual Magnum 1 pt PRE 4 0 5
Axiom 9 oz PRE 40 3 4
Sencor 75DF 5 oz PRE 65 13 24
Prowl + Outlook 5 pt + 1 pt PRE 9 1 9
Plateau + MSO 4 oz + 1.5 pt POST 0 80 60
LSD (0.05) 15 11 23
Bluebunch wheatgrass
Bluebunch wheatgrass
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
-----------% injury---------------
Prowl 5 pt PRE 1 1 0
Outlook 1 pt PRE 4 0 0
Dual Magnum 1 pt PRE 3 1 0
Axiom 9 oz PRE 18 3 0
Sencor 75DF 5 oz PRE 40 1 0
Prowl + Outlook 5 pt + 1 pt PRE 4 0 0
Plateau + MSO 4 oz + 1.5 pt POST 0 8 0
LSD (0.05) 10 4 0
Sandberg bluegrass
Sandberg bluegrass
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt PRE 3 0 NA
Outlook 1 pt PRE 2 0 NA
Dual Magnum 1 pt PRE 1 0 NA
Axiom 9 oz PRE 14 0 NA
Sencor 75DF 5 oz PRE 23 0 NA
Prowl + Outlook 5 pt + 1 pt PRE 4 0 NA
Plateau + MSO 4 oz + 1.5 pt POST 0 3 NA
LSD (0.05) 6 3 NA
Big bluegrassBig bluegrass
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt PRE 5 0 0
Outlook 1 pt PRE 9 3 0
Dual Magnum 1 pt PRE 3 0 4
Axiom 9 oz PRE 23 0 3
Sencor 75DF 5 oz PRE 59 0 0
Prowl + Outlook 5 pt + 1 pt PRE 6 0 0
Plateau + MSO 4 oz + 1.5 pt POST 0 13 0
LSD (0.05) 12 4 5
Perennial ryegrass
Perennial ryegrass
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt PRE 3 0 0
Outlook 1 pt PRE 9 1 0
Dual Magnum 1 pt PRE 1 0 0
Axiom 9 oz PRE 10 0 0
Sencor 75DF 5 oz PRE 18 1 0
Prowl + Outlook 5 pt + 1 pt PRE 9 0 0
Plateau + MSO 4 oz + 1.5 pt POST 0 74 74
LSD (0.05) 8 12 10
Chewings fescue
Chewings fescue
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
-----------% injury---------------
Prowl 5 pt PRE 1 0 3
Outlook 1 pt PRE 5 1 0
Dual Magnum 1 pt PRE 1 0 0
Axiom 9 oz PRE 14 1 4
Sencor 75DF 5 oz PRE 69 5 19
Prowl + Outlook 5 pt + 1 pt PRE 8 3 3
Plateau + MSO 4 oz + 1.5 pt POST 0 38 29
LSD (0.05) 11 9 22
Tall fescue
Tall fescue
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
-----------% injury---------------
Prowl 5 pt PRE 3 0 0
Outlook 1 pt PRE 14 0 1
Dual Magnum 1 pt PRE 6 0 0
Axiom 9 oz PRE 18 0 5
Sencor 75DF 5 oz PRE 29 0 1
Prowl + Outlook 5 pt + 1 pt PRE 13 0 0
Plateau + MSO 4 oz + 1.5 pt POST 0 80 93
LSD (0.05) 12 2 5
Kentucky bluegrass
Kentucky bluegrass
Treatment Prod/A Timing 10/2/01 4/19/02 5/22/02
----------------% injury--------------------
Prowl 5 pt PRE 3 3 3
Outlook 1 pt PRE 8 3 28
Dual magnum 1 pt PRE 3 1 34
Axiom 9 oz PRE 48 0 25
Sencor 75DF 5 oz PRE 65 1 25
Prowl + Outlook 5 pt + 1 pt PRE 9 1 33
Plateau + MSO 4 oz + 1.5 pt POST 0 8 14
LSD (0.05) 15 6 33