Diseases ›

Brown Patch

Symptoms

The symptoms of brown patch vary according to mowing height. In landscape situations, where mowing height is greater than 1”, brown patch appears as roughly circular patches that are brown, tan, or yellow in color and range from 6” to several feet in diameter. The affected leaves typically remain upright, and lesions are evident on the leaves that are tan in color and irregular in shape with a dark brown border. When the leaves are wet or humidity is high, small amounts of gray cottony growth, called mycelium, may be seen growing amongst affected leaves. In close-cut turfgrasses (1” or less), brown patch develops in roughly circular patches, ranging from a few inches to several feet in diameter, that are brown or orange in color. Distinct foliar lesions are not visible and mycelium is typically not present, but a black or dark gray ring, called a smoke ring, may surround the brown patches. The smoke ring is evidence of active disease development and is only present when the turfgrass leaves are wet or humidity is near 100%.

Development Factors

Brown patch is most severe during extended periods of hot, humid weather. The disease can begin to develop when night temperatures exceed 60°F, but is most severe when low and high temperatures are above 70°F and 90°F, respectively. The turfgrass leaves must be continuously wet for at least 10 to 12 hours for the brown patch fungus to infect. Poor soil drainage, lack of air movement, shade, cloudy weather, dew, over-watering, and watering in late afternoon favor prolonged leaf wetness and increased disease severity. Brown patch is particularly severe in turf that has been fertilized with excessive nitrogen. Inadequate levels of phosphorus and potassium also contribute to injury from this disease.

Cultural Control

Varieties of tall fescue vary widely in their susceptibility to brown patch. Selection of a tall fescue variety with a high level of brown patch resistance is a critical first step in any management program. There are few differences in brown patch resistance among varieties of bluegrass, ryegrass, or bentgrass.

Do not apply excess nitrogen when conditions favor disease development. In general, cool-season grasses should not receive more than 1 pound of nitrogen per 1,000 square feet at any one time. Avoid applying nitrogen to cool-season grasses in late spring or summer, or use very low rates (0.25 lb N/1000 ft2 or less) if necessary. Ensure adequate amounts of potassium and phosphorus by applying these nutrients based on soil test results.

Avoiding prolonged periods of leaf wetness will drastically reduce the severity of brown patch. Leaf wetness can originate from irrigation, dew, or guttation (which is the water that is sometimes exuded from turfgrass leaves during the night). To minimize leaf wetness, do not irrigate daily. Instead, irrigation should be applied based on weather conditions and the water requirements of the turf. The Turf Irrigation Management System is available on TurfFiles as a guide to irrigation scheduling. The time of day that irrigation is applied is also critical; it is best to irrigate early in the morning, just before sunrise. This removes large droplets of dew and water from the leaves and speeds drying of the foliage after sunrise. Avoid watering after sunrise or in the late afternoon or evening, as this will increase the duration of leaf wetness. In golf course turf, daily removal of morning dew can help to shorten leaf wetness periods and reduce brown patch development. This can be accomplished by mowing, dragging a hose, or by whipping the greens with a bamboo or fiberglass pole.

Proper landscape design and site preparation can help to minimize brown patch problems. Turf surrounded by trees, shrubs, buildings, or other barriers will remain wet for extended periods of time due to reduced air movement and sunlight. Removal or pruning of trees and other barriers will help minimize leaf wetness and discourage brown patch development. In shady areas, plant turfgrass species that are tolerant of low light levels, such as hard fescue, chewings fescue, or strong creeping red fescue..

Good surface and soil drainage will also help reduce the incidence of brown patch. Avoid establishing turf in low areas that collect water or in soil that is heavily compacted. Aerate high-traffic areas each fall to reduce compaction and maintain soil drainage. Golf course putting greens should be cultivated regularly to maintain soil drainage and aeration.

Chemical Control

Fungicides are effective for brown patch control, and can be applied on a preventative or curative basis. Curative applications may not be effective during periods of hot weather because the cool-season grasses are growing slowly and are unable to recover from the damage under these conditions. Consider a preventive fungicide program for tall fescue and creeping bentgrass when conditions favor disease development. For best results, preventative applications should be initiated in the late spring or early summer when night temperatures consistently exceed 60°F.

Fungicide and Formulation1
Amount of Formulation2
Application Interval3
Efficacy Rating
Resistance Risk
Fungicide and Formulation1

azoxystrobin
(Heritage) WG
(Heritage) TL
(Heritage) G
(Strobe)

Amount of Formulation2


0.2 to 0.4
1 to 2
2 to 4 lbs
0.38 to 0.77

Application Interval3


14 to 28
14 to 28
14 to 28
14 to 28

Efficacy Rating

++++



Resistance Risk

Low



Fungicide and Formulation1

azoxystrobin + acibenzolar-S-methyl (Heritage Action)*

Amount of Formulation2

0.2 to 0.4

Application Interval3

14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

azoxystrobin + chlorothalonil (Renown)*

Amount of Formulation2

2.5
4.5

Application Interval3

14
14 to 21

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

azoxystrobin + difenoconazole (Briskway)*

Amount of Formulation2

0.3 to 0.725

Application Interval3

14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

azoxystrobin + propiconazole (Headway)
ME
G

Amount of Formulation2


0.75 to 3
2 to 4 lbs

Application Interval3


14 to 28
14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

azoxystrobin + tebuconazole (Strobe T)*

Amount of Formulation2

0.75 to 1.5

Application Interval3

14 to 21

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

chloroneb (Teremec)*
SP
F

Amount of Formulation2


3 to 4
5 to 7

Application Interval3


7 to 10
7 to 10

Efficacy Rating

+

Resistance Risk

Low

Fungicide and Formulation1

chlorothalonil
(Daconil Ultrex)*

(Daconil Weather Stik, Legend)*

(Daconil Zn)*

(Chlorothalonil 500ZN)*

(Chlorothalonil 720SFT)*

(Chlorothalonil)*

Amount of Formulation2


1.8 to 3.23
3.7 to 5
2 to 3.6
4 to 5.5
3 to 5
6 to 8
3 to 5
7.9
2.12 to 3.5
5.5
1.8 to 3.2

Application Interval3


7 to 14
14
7 to 14
14
7 to 14
14
7 to 14
14
7 to 14
14
7 to 14

Efficacy Rating

+++










Resistance Risk

Low










Fungicide and Formulation1

chlorothalonil + acibenzolar-S-methyl (Daconil Action)*

Amount of Formulation2

2 to 3.5
4 to 5.4

Application Interval3

7 to 14
14

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

chlorothalonil + fluoxastrobin (Fame C)*

Amount of Formulation2

1.5 to 5.9

Application Interval3

14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

chlorothalonil + iprodione + thiophanate-methyl + tebuconazole (Enclave)*

Amount of Formulation2

3 to 4
7 to 8

Application Interval3

14 to 21
28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

chlorothalonil + propiconazole (Concert)*

Amount of Formulation2

3 to 5.5
5.5 to 8.5

Application Interval3

7 to 14
14 to 28

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

chlorothalonil + propiconazole + fludioxonil (Instrata)*

Amount of Formulation2

2.75 to 6

Application Interval3

14 to 21

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

chlorothalonil + thiophanate-methyl
(Spectro)*
(TM/C)*

Amount of Formulation2


3 to 5.76
2 to 8

Application Interval3


14 to 21
14 to 21

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

fluazinam (Secure)*

Amount of Formulation2

0.5

Application Interval3

14

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

fludioxonil (Medallion)

Amount of Formulation2

0.2 to 0.25
0.5

Application Interval3

7
14

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

fluoxastrobin (Fame)

Amount of Formulation2

0.09 to 0.36

Application Interval3

14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

fluoxastrobin + tebuconazole (Fame T)*

Amount of Formulation2

0.45 to 0.9

Application Interval3

21 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

fluxapyroxad (Xzemplar)

Amount of Formulation2

0.21 to 0.26

Application Interval3

14 to 21

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

flutolanil (Prostar)

Amount of Formulation2

1.5 to 3

Application Interval3

14 to 21

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

flutolanil + thiophanate-methyl (SysStar)

Amount of Formulation2

2 to 3

Application Interval3

14 to 21

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

iprodione (26GT, Iprodione Pro, Ipro)*

Amount of Formulation2

3 to 4

Application Interval3

14 to 28

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

iprodione + thiophanate-methyl (26/36)*

Amount of Formulation2

2 to 4

Application Interval3

14 to 21

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

iprodione + trifloxystrobin (Interface)*

Amount of Formulation2

3 to 5

Application Interval3

refer to label

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

mancozeb*
(Fore)
(Dithane)

Amount of Formulation2


4
4

Application Interval3


7
10

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

metconazole (Tourney)

Amount of Formulation2

0.28 to 0.37

Application Interval3

14 to 21

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

mineral oil (Civitas) + proprietary pigment (Civitas Harmonizer)*

Amount of Formulation2

(8 to 32) + (1 to 4)

Application Interval3

7 to 21

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

myclobutanil (Eagle, Myclobutanil)

Amount of Formulation2

1.2

Application Interval3

14

Efficacy Rating

+

Resistance Risk

Low

Fungicide and Formulation1

penthiopyrad (Velista)

Amount of Formulation2

0.3 to 0.5

Application Interval3

14 to 21

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

polyoxin D
(Affirm)
(Endorse)

Amount of Formulation2


0.88
4

Application Interval3


7 to 14
7 to 14

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

propiconazole (Banner MAXX, Propiconazole, Strider)

Amount of Formulation2

1 to 2

Application Interval3

14 to 21

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

pyraclostrobin (Insignia)
WG
SC

Amount of Formulation2


0.5 to 0.9
0.4 to 0.7

Application Interval3


14 to 28
14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

pyraclostrobin + boscalid (Honor)*

Amount of Formulation2

0.55 to 1.1

Application Interval3

14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

pyraclostrobin + fluxapyroxad (Lexicon Intrinsic)

Amount of Formulation2

0.34 to 0.47

Application Interval3

14 to 28

Efficacy Rating

++++

Resistance Risk

Low

Fungicide and Formulation1

pyraclostrobin + triticonazole (Pillar G)

Amount of Formulation2

3 lbs

Application Interval3

14 to 28

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

tebuconazole
(Torque)*
(Mirage)*
(Tebuconazole)*

Amount of Formulation2


0.6 to 1.1
1 to 2
0.6

Application Interval3


21
14 to 28
28

Efficacy Rating

++


Resistance Risk

Low


Fungicide and Formulation1

triadimefon (Bayleton)

Amount of Formulation2

0.5 to 1

Application Interval3

15 to 30

Efficacy Rating

++

Resistance Risk

Low

Fungicide and Formulation1

trifloxystrobin (Compass)

Amount of Formulation2

0.1 to 0.2
0.15 to 0.25

Application Interval3

14
21

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

trifloxystrobin + triadimefon
(Armada)
(Tartan)*

Amount of Formulation2


0.6 to 1.2
1 to 2

Application Interval3


14 to 28
14 to 28

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

triticonazole
(Trinity)
(Triton)
(Triton Flo)

Amount of Formulation2


0.75 to 2
0.15 to 0.3
0.41 to 1.1

Application Interval3


14 to 28
14 to 28
14 to 28

Efficacy Rating

++


Resistance Risk

Low


Fungicide and Formulation1

triticonazole + chlorothalonil (Reserve)*

Amount of Formulation2

3.2 to 5.4

Application Interval3

14 to 28

Efficacy Rating

+++

Resistance Risk

Low

Fungicide and Formulation1

vinclozolin (Curalan, Touche)*

Amount of Formulation2

1

Application Interval3

14 to 28

Efficacy Rating

+

Resistance Risk

Low

1 Other trade names with the same active ingredients are labeled for use on turfgrasses and can be used according to label directions.
2 Apply fungicides in 2 to 5 gallons of water per 1,000 square feet according to label directions. Use lower rates for preventive and higher rates for curative applications.
3 Use shorter intervals when conditions are very favorable for disease.
* Products marked with an asterisk are not labeled for home lawn use.

Efficacy Rating
++++ = excellent control when conditions are highly favorable for disease development
+++ = good control when disease pressure is high, excellent control when disease pressure is moderate
++ = good control when disease pressure is moderate, excellent control when disease pressure is low
+ = good control when disease pressure is low
? = not rated due to insufficient data

Resistance Risk
Low = Rotate to different chemical class after 3-4 applications; tank mixing not necessary
Medium = Rotate to different chemical class after 1-2 applications; tank-mixing with low or medium risk product recommended
High = Rotate to different chemical class after EVERY application; tank-mix with low or medium risk product for EVERY application
? = not rated due to insufficient data

Presentations

Publications

Species Data

Host species

bentgrass, bluegrasses, fescues, ryegrasses

brownpatch ltc
brownpatch ltc
brownpatch ltc
brown patchtf2 ltc
brown patchtf2 ltc
brown patchtf2 ltc
brown patchtf3 ltc
brown patchtf3 ltc
brown patchtf3 ltc
brown patchtf5 ltc
brown patchtf5 ltc
brown patchtf5 ltc
brown patchtf ltc
brown patchtf ltc
brown patchtf ltc
brown patch foliarblightbent1 ltc
brown patch foliarblightbent1 ltc
brown patch foliarblightbent1 ltc
brown patch foliarblightbent3 ltc
brown patch foliarblightbent3 ltc
brown patch foliarblightbent3 ltc
brown patch ltc
brown patch ltc
brown patch ltc
Months with symptoms

May to September

Stand symptoms

patches (4 inches to greater than 3 feet)

brownpatch ltc
brownpatch ltc
brownpatch ltc
brown patch 6 ltc
brown patch 6 ltc
brown patch 6 ltc
brown patch 7 ltc
brown patch 7 ltc
brown patch 7 ltc
brown patch10 ltc
brown patch10 ltc
brown patch10 ltc
brown patch3 ltc
brown patch3 ltc
brown patch3 ltc
brown patch4 ltc
brown patch4 ltc
brown patch4 ltc
brown patchtf2 ltc
brown patchtf2 ltc
brown patchtf2 ltc
brown patchtf3 ltc
brown patchtf3 ltc
brown patchtf3 ltc
brown patchtf5 ltc
brown patchtf5 ltc
brown patchtf5 ltc
brown patchtf ltc
brown patchtf ltc
brown patchtf ltc
brown patch ltc
brown patch ltc
brown patch ltc
brown patch smokering ltc
brown patch smokering ltc
brown patch smokering ltc
Foliar symptoms location/shape

leaf lesions

brown patch foliarblightbent1 ltc
brown patch foliarblightbent1 ltc
brown patch foliarblightbent1 ltc
brown patch foliarblightbent3 ltc
brown patch foliarblightbent3 ltc
brown patch foliarblightbent3 ltc
field brown patch leaf lesions ltc
field brown patch leaf lesions ltc
field brown patch leaf lesions ltc
Foliar symptoms color

tan, brown, or yellow

brown patch foliarblightbent1 ltc
brown patch foliarblightbent1 ltc
brown patch foliarblightbent1 ltc
brown patch foliarblightbent3 ltc
brown patch foliarblightbent3 ltc
brown patch foliarblightbent3 ltc
field brown patch leaf lesions ltc
field brown patch leaf lesions ltc
field brown patch leaf lesions ltc
Root/Crown symptoms

none

Fungal Signs

mycelium or none

brown patch fungalsigns ltc
brown patch fungalsigns ltc
brown patch fungalsigns ltc
field brown patch spreadingbyhyphae ltc
field brown patch spreadingbyhyphae ltc
field brown patch spreadingbyhyphae ltc