Herbicide Effects on Ryegrass Transition to Couch

1
Herbicide Effects on Ryegrass Transition to Couch

• Based on research by Tim Murphy
• The University of Georgia

2
Transition Issues

• Heat tolerance of ryegrass
• Renegade ryegrass
• Poa trivialis lives longer than expected
• Competition to couchgrass
• Long-term effects on couchgrass
• When do you accelerate transition?

3
Bermudagrass Growth

• Minimal root growth lt 10 C. soil temp.
• Optimum root growth 24-29 C. soil temp.
• Shoot growth ceases lt 27 C. air temp.
• Optimum shoot growth 27-35 C.
• Need night air temps. of around-16 C.
• 100 growing days

4
Chemical Aids for Transition

• Herbicides
• PGRs
• Delay application until couchgrass is in active
  spring growth.
• No green-brown-green!!
• Need green-green

5
Atlanta Athletic Club Project

• Tifway couchgrass fairway
• Seeded 9/26/99 with 85/15 MarvelGreen/Laser mix
• Clipping height 1.9 cm
• Irrigated as needed

6
Atlanta Athletic Club Project

• Herbicides and PGRs applied May 8, 2000
• 50/50 density of couchgrass and ryegrass
• Overall turf quality, couch and ryegrass density
  recorded at 7, 14 and 30 DAT

7
Manor
8
MANOR ON TRANSITION
UTC
20g/Ha
33g/Ha
61.2g/Ha
9
Sencor and Corsair
10
SENCOR ON TRANSITION
33g/Ha
20g/Ha
UTC
11
CORSAIR ON TRANSITION
61.2g/Ha
123g/Ha
UTC
12
Kerb and Embark
Turf Quality
13
KERB ON TRANSITION
UTC
1.5kg/Ha
3.0kg/Ha.
14
EMBARK ON TRANSITION
374g/Ha.
497g/Ha
UTC
15
CONCLUSIONS

• Manor - good to excellent couch tolerance, causes
  light green color, reduces ryegrass density,
  minimum rate is 14g.
• Corsair - excellent couch tolerance, not as
  effective as Manor, Kerb and Sencor in reducing
  ryegrass

16
CONCLUSIONS (cont.)

• Embark- excellent couch tolerance, no effect
  color, effectiveness on ryegrass is questionable,
  need research on repeat applications, earlier
  timings.
• Kerb - excellent couch tolerance, causes dark
  blue-green color, reduces ryegrass density, need
  research on lower rates, irrigation is critical

17
OTHER TRANSITION HERBICIDES

• TranXit (rimsulfuron)
• Revolver (foramsulfuron)
• Monument (trifloxysulfuron-sodium)
• Flazasulfuron (Katana)
• Sulfosulfuron (Battalion)

18
Monument Transition Project - 2001

• GA Station
• Perennial ryegrass Sunrise Primo
• Tifway couchgrass
• 1.9cm. clip height
• 2 appl. 48.6 and 62.3g/Ha
• 25 gpa
• 0.25 v/v NIS with all herbicides except Kerb

19
Monument One Appl. (5/16/01)
20
Monument Two Appl. (5/16 6/14/01)
21
MONUMENT One Appl. (5/16/01)
MON 6.2g/Ha
Kerb 1.5kg/Ha
UTC
MON 18.7g/Ha
22
Monument Two Appl. (5/16 6/14/01)
MON 6g/Ha
MON 12.3g/Ha
TranXit 125g/Ha
UTC
23
Monument Transition Project - 2003

• GA Station
• Perennial ryegrass Sunrise Primo
• Tifway bermudagrass
• 1.6cm clip height
• 4 appl. timings 30, 60, 80 100 spring
  green-up
• 25 gpa, 0.25 v/v NIS with Monument

24
30 CYNDA Green-up (3/25/03)
MON 6.2g/Ha
MON 18.7g/Ha
Kerb 1.5kg/Ha
UTC
25
60 CYNDA Green-up (4/23/03)
MON 6.2g/Ha
MON 18.7g/Ha
Kerb 1.5kg/Ha
UTC
26
80 CYNDA Green-up (5/09/03)
Revol. 560g/Ha
MON 6.2g/Ha
MON 18.7g/Ha
UTC
27
100 CYNDA Green-up (5/20/03)
Revol. 560g/Ha
MON 6.2g/Ha
MON 18.7g/Ha
UTC
28
Revolver Transition Project - 2002

• GA Station
• Perennial ryegrass Sunrise Primo
• Common couchgrass
• 1.9cm. clip height
• Single appl. 5/10/02, 70 green-up
• 25 gpa
• NIS with TranXit, Manor and Monument

29
Revolver Turf Quality
Applied 5/10/02
30
Revolver on Transition
Applied 5/10/02
Rev 62.4g
Monum 18.7g/Ha
Man 31.2g/Ha
TranX 62.4g/Ha
UTC
31
BattalionTransition Project - 2002

• GA Station
• Perennial ryegrass Sunrise Primo
• Common couchgrass
• 1.9 cm. clip height
• Single appl. 4/23/02, 50 green-up
• 25 gpa
• NIS with Battalion, TranXit, and Manor

32
Battalion Turf Quality
Applied 4/23/02
33
Battalion on Transition
Applied 4/23/02
Batt 81g
UTC
TranX 250g
Kerb 1.8
Manor 31.2g
34
KatanaTransition Project - 2002

• GA Station
• Perennial ryegrass Sunrise Primo
• Common couchgrass
• 1.6 cm. clip height
• Single appl. 4/23/02, 50 green-up
• 25 gpa
• NIS at 0.25 v/v included

35
Katana Turf Quality
Applied 4/23/02
36
Katana on Ryegrass Injury
Applied 4/23/02
37
POST ANNUAL BLUEGRASS CONTROL IN OVERSEEDED
BERMUDAGRASS

• Prograss limited range of efficacy
• Battalion
• rates, timing, efficacy research
• Velocity
• Valent
• SLN in GA, FL, SC, NC

38
Velocity

• bispyribac-sodium, labeled in rice
• Use rates 81 to 162g.product/Ha
• inhibits ALS, no synthesis of branched chain
  amino acids
• not a sulfonylurea, but slow acting
• root and shoot absorbed, ½ life lt 10 d

39
Velocity Projects - 2002

• GA Station
• Perennial ryegrass Sunrise Primo
• Tifway bermudagrass
• 1.9 cm. clip height
• Irrigated site

40
Velocity Perennial Ryegrass Injury
Applied 4 wks after seeding, 3-lf ryegrass
41
Velocity Annual Bluegrass Control
Applied 4 wks after seeding, Oct. 23, 2001
42
Velocity Perennial Ryegrass Injury
Applied 18 wks after seeding, Feb. 8, 2002
43
Velocity Annual Bluegrass Control
Applied 18 wks after seeding, Feb. 8, 2002
44
Velocity Perennial Ryegrass Injury
Applied 17 and 20 wks after seeding, Mar. 7
Apr. 1, 2002
45
Velocity Annual Bluegrass Control
Applied 17 and 20 wks after seeding, Mar. 7
Apr. 1, 2002
46
Accelerating Transition

• Delay application until couchgrass is in active
  spring growth.
• Know 30 day forecast
• No green-brown-green!! (on most sites)
• Need green-green

47
Couchgrass Growth

• When do you accelerate transition?
• Minimal root growth lt 10 C. soil temp.
• Optimum root growth 24-29 C. soil temp.
• Shoot growth ceases lt 13 C. air temp.
• Optimum shoot growth 27-35 C.
• Need night air temps. of around 16 C.

48
Transition Options

• Slow 4 to 6 wks
• Kerb
• Embark (repeats)
• Cultural techniques

• Fast 10 to 30 days
• Katana
• TranXit
• Manor
• Revolver
• Monument
• Battalion

49
Health and vigor of couchgrass is exceedingly
important to a smooth transition.