July 12, 2007
 
University of Arkansas, Turfgrass Science Program (http://turf.uark.edu/)

1. Turfgrass Field Day (Wednesday, August 1) – Sign up now!
2. New Extension Publications
     - Liming Your Lawn (FSA6134)
3. Brown Patch of Tall Fescue

Read the entire turf tip at: http://turf.uark.edu/turfhelp/archives/071207.html

 

Turfgrass Field Day
The University of Arkansas turf field day will be on August 1 this year. The field day is located in Fayetteville at the Agricultural Research Center. Field day provides individuals the opportunity to hear the latest up-to-date information about new products and research studies as well as providing an opportunity to network with others in the turf industry. Turfgrass research tours are available for those in lawn care/landscaping as well as those in golf/sports turf. Lunch, a hat and an information packet are provided. An afternoon program on handling pesticides is also available for pesticide recertification training. Pre-registration deadline is July 25! Sign up now!

New Extension Publication
Liming Your Lawn (FSA6134) – Do you have questions about liming your lawn? This publication guides you through the steps of liming your lawn. Click here to read the full publication.

Brown Patch of Tall Fescue
Turf-type tall fescue (Festuca arunidnacea) is the most commonly used cool-season turfgrass species for lawns in Arkansas. Approximately 12% of Arkansas lawns are tall fescue. Tall fescue produces an attractive lawn in fall and spring and even maintains some green color during winter (Figure A). However, it is susceptible to environmental stresses and pathogens during the summer that can dramatically decrease its turf quality. Brown patch of tall fescue is the most common disease of tall fescue lawns. It is caused by the fungal pathogen Rhizoctonia solani. Under favorable conditions (night temperatures above 68° with high relative humidity) this disease can develop rapidly. Typically, the symptoms start out as small circular or irregular shaped patches. Lesions initially develop on the leaves, and the turf will turn off-color and quickly fade to a light brown (Figure B). The patches may be 2 inches in diameter or much larger at 2 or more feet in diameter (Figure B).

Brown Patch

One of the greatest tools that homeowners and turf managers have at their disposal in reducing the severity of this disease is to implement proper cultural controls. The first step in any good cultural control program is to select cultivars that have some level of resistance to the pathogen. Figures C and D illustrate the impact that choosing a good cultivar can have on the quality of tall fescue during periods of disease activity. Table 1 provides information on the percent brown patch infection and intensity of infection on commonly available tall fescue seed blends. Tall fescue seed blends with low disease severity should be used for planting and renovating turf. Table 2 provides a listing of individual cultivars, their brown patch resistance, and turf quality. Cultivars with both good resistance to brown patch and good turf quality should be selected and used in seed blends.

Other cultural practices that help reduce brown patch severity are;

  1. Reducing the amount of nitrogen fertility and applying 2/3 or more of the nitrogen fertilizer during the fall. Avoid applying nitrogen fertilizers to tall fescue lawns in June, July, or August.
  2. Use slow-release sources of nitrogen during spring fertilizer applications.
  3. Irrigate lawns deeply and infrequently and try to irrigate between the hours of 5:00 am and 7:00 am. Reducing moisture will help to reduce disease severity.

If all else fails, a curative application of a fungicide can be applied. There are many fungicides labeled for control of Rhizoctonia spp.

Table 1. Brown patch percent infection and intensity of commonly available tall fescue seed blends. To help select the best cultivars, a severity rating can also be calculated by multiplying percent infection by intensity. Tall fescue seed blends with low disease severity should be used for planting and renovating turf.

Brown Patch Severity


Table 2. Brown Patch Incidence in the 2001 National Turfgrass Evaluation Program Tall Fescue Test.


Cultivar name

Mean Percent Brown Patch in 2005 (Fayetteville, AR). Low values indicate less disease.

Mean turf quality across four years (Fayetteville, AR). High values indicate better turf quality with 9 being optimum.

 

 

 

KY-31 E+

12.7

3.0

AVENGER (L1Z)

14.3

5.9

R-4

15.2

6.1

OLYMPIC GOLD

15.4

5.3

APACHE III (PST-5A1)

15.6

6.0

BLADE RUNNER (ROBERTS SM4)

15.6

5.4

KALAHARI

15.7

5.7

CAYENNE

15.8

5.9

TURBO (CAS-MC1)

15.9

6.0

HOUNDOG 6 (CIS-TF-67)

16.9

5.8

COCHISE III (018)

17.3

6.2

SOLARA (BE1)

17.6

6.1

TAR HEEL

17.7

5.1

SERENGETI (GO-OD2)

18.0

5.1

ULTIMATE (01-RUTOR2)

18.0

5.5

TITANIUM (SBM)

18.1

5.4

MRF 26

18.7

5.7

PST-5BAB

19.1

5.3

WOLFPACK

19.1

5.3

PST-5LO

19.4

5.6

MAGELLAN (OD-4)

19.5

5.8

DOMINION

19.6

5.3

RAPTOR (CIS-TF-33)

19.6

5.4

ENDEAVOR

19.8

5.5

JUSTICE (RB2-01)

19.8

5.9

TAR HEEL II (PST-5TR1)

19.9

5.3

BARVADO (BAR FA 1005)

20.0

6.0

PIEDMONT (MRF 27)

20.1

5.6

PST-5FZD

20.1

5.5

SIGNIA

20.1

5.5

FALCON IV (F-4)

20.4

5.3

PICK ZMG

20.4

5.5

PST-5BZ

20.5

5.5

BARROBUSTO (BAR FA 1003)

20.8

5.7

GUARDIAN-21 (ROBERTS DOL)

20.8

5.5

FIVE POINT (MCN-RC)

21.1

5.6

PICASSO

21.1

5.7

SILVERADO II (PST-578)

21.1

5.4

CONSTITUTION (ATF-593)

21.3

5.6

FOCUS

21.4

5.4

GREENKEEPER WAF (K01-WAF)

21.6

6.0

PADRE (NJ4)

21.6

5.7

SR 8250

21.6

5.3

MRF 210

21.8

5.7

INFERNO (JT-99)

22.0

6.1

RIVERSIDE (PROSEEDS 5301)

22.3

5.7

REMBRANDT

22.4

5.3

LEXINGTON (UT-RB3)

22.5

5.8

PST-53T

22.5

5.9

ESCALADE (01-ORU1)

22.6

5.1

DYNASTY

23.2

5.0

MUSTANG 3

23.3

5.5

FINELAWN ELITE (DLSD)

23.4

5.9

PST-5NAS

23.4

5.3

PURE GOLD

23.4

5.0

REBEL EXEDA

23.4

6.1

SILVERSTAR (PST-5ASR)

23.5

5.7

MASTERPIECE

24.0

5.4

B-7001

24.3

5.4

GO-SIU2

24.3

4.3

JAGUAR 3

24.3

5.1

PROSPECT

24.3

5.2

JT-12

24.5

5.9

JT-9

24.6

5.3

TAHOE (CAS-157)

24.6

5.2

TITAN LTD.

24.6

4.7

COYOTE

24.7

5.4

PST-5S12

24.7

5.8

SCORPION II (ATF 799)

24.7

5.1

SR 8600

24.7

5.4

BILTMORE

24.8

5.8

MILLENNIUM

24.8

5.8

REGIMENT II (SRX 805)

25.1

5.2

NINJA 2 (ATF-800)

25.3

5.6

FIDELITY (PST-5T1)

25.4

5.7

REBEL SENTRY

25.5

5.4

PST-5KU

25.9

5.6

QUEST

26.0

5.9

CAS-ED

26.5

5.7

ATF 704

26.6

5.1

CHIPPER (MRF 211)

26.6

5.4

MATADOR GT (PST-5TUO)

26.6

5.2

JT-6

26.9

5.9

RENDITION

26.9

5.6

VIRTUOSO (CIS-TF-77)

27.0

5.2

FORTE (BE-2)

27.5

5.7

BLACKWATCH (PICK-OD3-01)

27.6

5.8

K01-E09

27.6

5.1

HUNTER (CIS-TF-60)

27.7

5.9

BAR FA 1CR7

27.9

5.6

GO-RD4

28.2

4.7

SHERIDAN (NA-TDD)

28.2

5.7

PENN1901 (PLANTATION)

28.6

5.8

SOUTHERN CHOICE II

28.6

5.2

STONEWALL (JT-18)

28.7

5.0

BARRERA

28.9

5.4

TOMAHAWK GT

28.9

5.3

TUXEDO (ATF 702)

28.9

5.1

PST-DDL

29.0

5.6

TEMPEST

29.4

5.3

TRACER

29.8

5.4

2ND MILLENNIUM

29.9

6.3

PST-5JM

29.9

5.8

MRF 29

30.0

5.5

PICK-00-AFA

30.0

5.3

TROOPER (01-TFOR3)

30.1

4.9

FIREBIRD (CIS-TF-65)

30.4

5.9

INNOVATOR (PST-5KI)

30.8

5.5

SR 8550 (SRX 8BE4)

31.0

5.3

DLF-J210

31.1

5.2

GREMLIN (P-58)

31.1

5.2

LARAMIE

31.1

4.7

DESIRE (MRF 28)

31.5

5.4

EVERGREEN 2 (EA 163)

31.9

5.5

EXPEDETION (ATF-803)

31.9

4.8

WATCHDOG

32.4

5.0

FALCON II

32.7

4.9

JT-15

32.8

5.1

LEGITIMATE

32.8

4.8

SCORPION

32.8

5.1

OL' GLORY (MA 127)

32.9

5.6

TERRANOVA (T991)

33.2

5.3

GRANDE II

33.3

5.6

FINESSE II

33.4

5.7

BARLEXAS

33.8

4.7

BEACON (UT-155)

33.9

4.7

DAVINCI (LTP-7801)

33.9

5.6

JT-13

34.1

5.6

BARRINGTON

34.2

4.9

BINGO

34.2

5.4

PICK TF H-97

34.6

4.1

KITTY HAWK 2000

34.7

4.9

K01-8007

34.8

5.1

MA 138

34.8

5.1

VENANZIO (DP 50-9226)

34.8

4.8

DAYTONA (MRF 23)

35.1

5.1

K01-E03

35.2

5.1

FLORIDIAN (GO-FL3)

35.4

3.9

ELISA

35.6

4.1

DYNAMIC (PST-57E)

35.8

5.7

STETSON

35.9

4.4

ATF 586

36.9

4.9

MA 158

37.0

4.9

BARLEXAS II

37.1

5.2

CORGI (CIS-TF-64)

37.4

5.3

SOUTH PAW (MRF 24)

37.6

4.6

COYOTE II (K01-8015)

38.2

5.4

WYATT

38.4

4.9

TF66

39.1

5.1

COVENANT (ATF 802)

39.4

4.8

BONSAI

39.7

4.0

DP 50-9082

41.4

4.3

LANCER

43.2

4.5

ATF 806

43.8

4.4

MRF 25

44.2

4.9

MATADOR

44.4

5.1

JTTFF-2000

44.6

4.2

BRAVO

45.4

4.7

ATF 707

45.9

4.6

TULSA II (ATF 706)

47.8

4.7

 

 

 

LSD VALUE

11.4

1.0

C.V. (%)

43.5

11.4

Data for additonal locations is available at ntep.org.

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