Brown Ring Patch

aka ‘Waitea patch’

Print page
brown ring patch

The Problem

Brown ring patch (aka ‘Waitea patch’) is a spring and early summer disease of annual bluegrass, rough bluegrass and creeping bentgrass greens. The disease is caused by Waitea circinata var. circinata, a Rhizoctonia-like basidiomycete. The disease is most prevalent on annual bluegrass and on turf that is maintained at putting green height.

What To Look For

Brown ring patch typically appears in the spring with maximum daily air temperatures of 65-85°F. Soil temperatures between 55-60°F are associated with initial disease development. It is more severe on greens that have low nitrogen fertility, and often develops first on areas that are dry or are under other environmental stresses. On annual and rough bluegrass, brown ring patch initially appears as bright yellow rings a few inches to one foot in diameter. Rings can merge together to develop a characteristic “honeycomb” or “scalloped” pattern. Older rings can become brownish-yellow in color and develop a sunken appearance. On creeping bentgrass, rings appear orange-bronze and can also have a sunken appearance. Brown ring patch symptoms may be similar to take-all, summer patch, fairy ring, brown patch (Rhizoctonia solani) or yellow patch (R. cerealis). Laboratory diagnosis is recommended to confirm the identity of the pathogen and choose the correct control measures. If brown ring patch has been confirmed in the past, a quick diagnostic test is to incubate suspected samples overnight in a moist plastic bag. After incubation, active brown ring patch will show up as abundant white-gray mycelia in the upper mat and thatch layer, extending up through the canopy and foliage.

The Solution

Increased nitrogen fertility and adequate water availability are key cultural practices to reduce symptoms of the disease. Reducing thatch and dry areas on greens, surrounds and tees will help lessen disease development. Preventive fungicide applications are recommended when soil temperatures are between 55-60°F. Both Mirage® Stressgard® and Densicor® will provide long-lasting preventive as well as curative control. Brown ring patch is not controlled by thiophante-methyl or other benzimidazole fungicides. Fungicides should be applied in a water volume of 2 gal./1,000 sq. ft. and lightly watered in following application. Curative applications are less effective, and repeated applications may be needed for complete control. Curative applications should be made as soon as symptoms are seen for best results. Addition of polyoxin-D as a tank-mix partner will help with ‘knock-down’ of the disease with Mirage Stressgard or Densicor providing long-term residual control.

Additional resources


pdf icon Solution sheet - Brown ring patch

Recommended products

Lockup_Flagship_Mirage_R_StressgardR_Gradient_RGB.png Fungicide

Mirage Stressgard

Controls foliar and soil-borne fungal diseases and provides...

See product
Lockup_Flagship_Densicor_Gradient_RGB.jpg Fungicide

Densicor

Protect Your Course From the Top Five Most Problematic Turf...

See product
Castlon_TM_Lockup_Gradient_RGB.png Fungicide

Castlon

Castlon™ fungicide uses the original fluoxastrobin...

See product

Anthranose

Anthracnose

Read more
fairyring

Fairy ring

Read more
summer patch in turfgrass

Summer patch

Read more
Symptoms of Pythium root rot

Pythium root rot (PRR)

Read more
range of mini ring symptoms on bermudagrass greens

Mini ring

(Leaf and Sheath Spot)

Read more