“New” Herbicide Options for Sports Fields Tim R. Murphy The University of Georgia 2003 GTA Conference

Bermudagrass - The Big Three

 Non-Overseeded  Simazine (Princep, Wynstar, etc.)  MSMA or DSMA  2,4-D (possibly a 2-way or three-way)

“Newer” Herbicides

 TranXit - SU  Manor - SU  Corsair - SU  Revolver - SU  Monument – SU  Velocity – Not an SU, but similar MOA, not currently labeled on sports fields

“Newer” Herbicides

 Speed Zone Broadleaf  Speed Zone - Southern  Power Zone Broadleaf  Drive (not real new, but underutilized0

TranXit – Griffin LLC



Poa

control before overseeding DNAs, Dimension, Kerb, Rubigan 

Poa

control in non-overseeded bermuda, centipede and zoysia  Triazines, Kerb, Diquat  Spring transition aid in overseeded bermuda  Manor, Revolver, Monument, Kerb, Embark  LABELED on SPORTS FIELDS

Weeds Controlled by TranXit

 annual bluegrass  ryegrass spp.

 little barley  tall fescue  blue-eyedgrass  rough bluegrass  common chickweed  shepherd’s-purse  henbit  field pansy  cutleaf eveningprimrose  spotted spurge  pennywort (dollarweed)

TranXit

 Rimsulfuron 25DF  Sulfonylurea  2.0 to 4.0 ozs. product/acre  Chemically degraded, more rapid under alkaline or acid conditions  T1/2 in soil is 1.7 to 4.3 days

Georgia Experiments - Griffin

 ‘Tifway’ bermudagrass, 0.75 in. ht.

 Overseeded Oct. 17, 2000  ‘TourStar’ perennial ryegrass blend  Irrigated site  25 gpa

Herbicide Rates

 TranXit – 1, 2, 4 and 8 oz./acre  Dimension 1EC – 2.0 qts./acre  Barricade 65DG – 0.75 lbs./acre  Balan 2.5G – 80 lbs./acre

Perennial ryegrass density.

70 60 50 40 30 20 10 0

*

1 MAO Tranxit 2 oz, 2WBO Barricade 6WBO

*

2 MAO Dimension 6WBO No Herbicide 3 MAO Balan 6WBO

*

Poa annua

control.

100 90 80 70 60 50 40 30 20 10 0 160 DAO Tranxit 2 oz, 2WBO Barricade 6 WBO

*

175 DAO Dimension 6WBO No Herbicide

* *

182 DAO Balan 6 WBO

TranXit did not injure Tifway bermudagrass applied: a) 4, 2 or 1 wk in advance of overseeding b) Tank-mixed with Rubigan c) Applied after Dimension, Barricade or Balan were applied 6 WBO

Manor, Blade

 Metsulfuron 60 DF  Excellent option for ‘Pensacola’ bahiagrass and broadleaf control in warm-season turfgrasses  Do not use on bahiagrass  Low rate - < 1.0 oz. product/acre  Use with nonionic surfactant  LABELED on SPORTS FIELDS

Corsair - Riverdale

 Chlorsulfuron 75%  Used primarily for spot control of clumpy tall fescue in bermuda works slowly  Repeat application in 60 d  LABELED on SPORTS FIELDS

Overseeded Bermudagrass

 Preemergence options for

Poa annua

 Kerb - 60 to 90 days • or charcoal  Dimension – 8 wks  Barricade – 8 wks  Balan – low rate, 6 weeks  Rubigan, Patchwork – cost limits use to greens  Prograss – greenup issue

New

Poa annua

Options in Overseeded Bermudagrass  TranXit – rimsulfuron,  t1/2 = 1.7 to 3.4 days  Revolver – foramsulfuron,  t1/2 = 1 to 12 days  LABELED ON SPORTS FIELDS?????????

 Persistence is less in acid than alkaline soils

Revolver – Bayer Environ. Sciences

 Foramsulfuron - 0.19SC, POST  First liquid sulfonylurea, no NIS required  4.4 to 26.2 fl. ozs. product/acre (use high rate for centipede suppression and goosegrass)  t1/2 in soil is 1 to 12 days  Chemically degraded, more rapid under alkaline or acid conditions

Revolver



Poa

control before overseeding [2 WBS]  DNAs, Dimension, Kerb, Rubigan, TranXit 

Poa

control in non-overseeded bermuda and ‘Meyer’ zoysia  Triazines, Kerb, Diquat  Spring transition aid in overseeded bermuda  Manor, TranXit, Monument, Kerb, Embark  NON-RESIDENTIAL USE ONLY

Weeds Controlled by Revolver

 annual bluegrass  ryegrass spp.

 little barley  tall fescue  rough bluegrass  bentgrass  henbit  bentgrass  goosegrass

Goosegrass Control - Griffin

 ‘Tifway’ bermudagrass, 0.75 in. ht.

 Irrigated site  25 gpa  Revolver: 17.4, 26.2 fl. ozs./ac  MSMA + Sencor: 2.7 pts. + 2.7 ozs./ac  Illoxan: 1.4 qts./ac  Applied 6-12 and 6-19, 2002  2 to 3 tiller goosegrass

Goosegrass control with Revolver. 2002.

Revolver 17.2

100 90 80 70 60 50 40 30 20 10 0 Injury 4 Revolver 26.2

Illoxan Goosegrass 6 Weeks MSMA + Sencor Goosegrass 11

Poa annua

Control - Griffin

 ‘Tifway’ bermudagrass, 0.625 in. ht.

 Irrigated site  25 gpa  Revolver: 8.8, 17.4 fl. ozs./ac – appl. 2 or 1 WBS  TranXit: 2.0 oz./ac – appl. 2 WBS  Prograss: 1.0 gal./ac – 6 WPS  “Sunrise Primo’ seeded 11-01-2002

Effect of Revolver on Ryegrass Establishment. 2002/3.

40 30 20 10 0 90 80 70 60 50 6 15 Weeks Revolver 8.8 2WBS Revolver 17.4 1 WBS Revolver 17.4 2 WBS Tranxit 2.0 2 WBS 20 Revolver 8.8 1 WBS UTC

Effect of Revolver on

Poa annua control

. 2002/3.

100 80 60 40 20 0 22 26 Revolver 8.8 2WBS Revolver 17.4 1 WBS Weeks Revolver 17.4 2 WBS Tranxit 2.0 2 WBS Revolver 8.8 1 WBS

Monument– Syngenta

 Trifloxysulfuron-sodium 75 WDG, POST  0.1 to 0.56 ozs. product/acre (use higher rates for sedges and

Poa annua

)  t1/2 in soil is 5 to 15 days  Chemically degraded, more rapid under alkaline or acid conditions  Add NIS at 0.25% v/v

Monument



Poa

control in non-overseeded bermuda and zoysia  Triazines, Kerb, Diquat, Revolver, TranXit  Spring transition aid in overseeded bermuda  Manor, TranXit, Monument, Kerb, Embark, Revolver  Broadleaf weed and sedge control (winter and summer)  NON-RESIDENTIAL USE ONLY

Weeds Controlled by Monument

 annual bluegrass  ryegrass spp.

 little barley  rough bluegrass  torpedograss  tall fescue  henbit  dichondra  Va. Buttonweed  nutsedge (yellow and purple)  green kyllinga  carpetweed  spotted spurge

Monument Transition Project - 2001  GA Station  Perennial ryegrass – ‘Sunrise Primo’  ‘Tifway’ bermudagrass  0.75 in. clip height  2 appl. – 5/16 and 6/14  25 gpa  0.25% v/v NIS with all herbicides except Kerb

Monument – One Appl. (5/16/01)

10 8 6 4 2 0 Monument Monument 0.1 oz.

0.3 oz TranXit 4.0

8 d 36 d 45 d Kerb - 1.5

UTC

Monument – Two Appl. (5/16 + 6/14/01)

10 2 0 8 6 4 Monument 0.1 oz Monument 0.3 oz TranXit 2 UTC 7 d-B 15 d-B 30 d-B

MONUMENT – One Appl. (5/16/01)

CYNDA LOLPE 100 80 60 40 20 0 15 d 36 44

MON 0.1

15 36

MON 0.3

44 15 36

Kerb 1.5

44 15 36

UTC

44

Monument – Two Appl. (5/16 + 6/14/01)

CYNDA LOLPE 100 80 60 40 20 0 7 dB 15 30

MON 0.1

7 15

MON 0.3

30 7 15

TranXit 2

30 7 15

UTC

30

Velocity, 1.3 fb 1.3 oz/ac 2/18 + 3/03 3/03 + 3/21 Turf17-03: Photo April 9, 2003, NIS left, MSO right

Other Herbicides in Development  Flazasulfuron (Katana) -ISK BioSciences  Sulfonylurea  Sulfosulfuron (Battalion) – Monsanto  Sulfonylurea  Fluroxypyr (Spotlight) – DowAgroSciences  Pyridine

Flazasulfuron (Katana) -ISK BioSciences  Bermuda, zoysia, centipede  St. Augustine and cool-seasons not tolerant  Spring transition aid, seedling crabgrass (<4-lf), nutsedge and kyllinga, numerous broadleaf weeds

Sulfosulfuron (Battalion)- Monsanto  Bermuda (most tolerant), St. Augustine, centipede, zoysia  Cool-season tolerance is low and highly rate dependent  Spring transition aid, nutsedges, kyllinga

Fluroxypyr (Spotlight) DowAgroSciences  Cool-season tolerance is good  Warm-season tolerance is low and highly rate dependent  May see as an ingredient in other 2- and 3-way broadleaf control herbicides

New PBI Gordon Broadleaf Herbicides Herbicide Power Zone carfentrazone 2,4-D MCPA 0.04

lbs. ai/gallon - 2.2

a MCPP dicamba 0.44

0.22

Speed Zone 0.05

1.53

a - 0.48

0.14

0.04

0.52

a - 0.2

0.05

Speed Zone (Southern) a Ester

Carfentrazone

 Triazolinone family  Post, contact activity, cell membrane disrupter  Rapidly absorbed, only limited translocation  No soil activity  t 1/2 - 2.5 to 4 d  non-mobile  Negligible volatility

Why add carfentrazone?

 Better activity in cool weather  Faster development of control symptoms  hours vs. days  complete control in 7 to 14 days  Better activity on spurges

White Clover Control – Griffin - 2001

100 80 60 40 20 0 3 7 14 Days after treatment Trimec Classic Confront SZ - St. Aug.

PowerZone 38

Tall Fescue Injury – Griffin - 2001

8 7 6 5 4 3 2 1 0 3 7 Days after treatment Trimec Classic Confront SZ-St. Aug.

PowerZone 14

Common Bermuda Injury – Griffin - 2001

20 15 10 5 0 3 7 14 Days after treatment Trimec Classic Confront SZ - St. Aug.

PowerZone 38

New PBI Gordon Broadleaf Herbicides Turfgrass Ky. Bluegrass Tall Fescue Fine Fescue Ryegrass Bermudagrass Centipedegrass St. Augustine Sea. Paspalum Zoysia PowerZone X X X X X SpeedZone X X X X X X X SpeedZone –South.

X X X X X X X X X

PowerZone & SpeedZone Formulations  Repeat appl. in 2 to 6 wks if needed  Newly seeded  delay appl. until after 2 nd mowing  Newly sodded, sprigged or plugged  delay appl. for 3 to 4 weeks  Avoid green-up appls. on St. Aug.

PowerZone & SpeedZone Formulations  Avoid appl. at air temps. > 90 F.

 Can reseed 2 weeks after application  Do not mow 1 to 2 d before or after application  Needs 24 hr rain-free period

Drive - BASF

 Quinclorac 75 DF  Add crop oil concentrate (2.0 pts./acre)  Labeled on tall fescue, zoysiagrass, bermudagrass  established, at seeding/sprigging, during “grow-in”

Drive - BASF

 Controls crabgrass, white clover, hop clovers, speedwell, dollarweed  Torpedograss - requires 2 to 3 applications  Will not control goosegrass or annual bluegrass  Use with extreme caution near tomatoes, bell peppers, etc.

Practical Tips

 Use only labeled herbicides  Get the right equipment  Train your applicator  Calibrate all equipment  Control weeds during the off-season or off-times

www.georgiaturf.com

A pretty d--- good web page for turfgrasses!!