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Brown Patch | |
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 | Rhizoctonia solani
Disease description
A "smoke-ring" of greyish-black myceiium from 1.5 to 4 cm wide develops around an active patch. Attacked grass leaves show dark-bordered lesions, become water-soaked and blackened, collapse, then dry up and become light brown with scierotia at plant bases. Patches 2 cm to 1 m in diameter may occur in short mown turf. It may progress very rapidly. Mainly in parts of eastern Canada and southern B.C., although a lower temperature form of the disease has been found in the Prairies.
Predisposing factors
- all grasses are affected, but some Agrostis cultivars are very susceptible
- hot, very humid daytime weather conditions with night temperatures about 18 degrees C
- unbalanced nitrogen applications leading to development of lush rapid growth
- frequent mowing renders fine turf more susceptible, as the fungus gains entry through wounds
Cultural control
Avoid unbalanced or excessive nitrogen applications particularly where there is a history of the disease. Reduce frequency of mowing. Reduce irrigation, especially late in the day during danger periods. |
For information about other diseases that affect turf grasses, go to Major Diseases of Turf Grasses in Western Canada |
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For more information about the content of this document, contact Shelley Barkley.
This information published to the web on November 20, 2001.
Last Reviewed/Revised on November 19, 2018.
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