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Fungal Diseases: One of the usual suspects is a brown patch fungus, especially when the weather is warm and humid. This fungus creates irregular, brown, and sometimes sunken patches on your lawn.
Brown patch symptoms differ depending on the various maintenance practices performed on the turfgrass (mowing height, fertilizer, watering, etc.) Symptoms on turfgrasses that are wet for extended periods and are closely mowed will produce a distinctive gray-purplish bordered ring "smoke-ring" that is up to 50 cm in diameter. [3]
Use fungicide only when necessary. For turf with a history of disease, preventive applications are advisable, says Waltz. If you’re experiencing hot and dry conditions, you don’t need fungicide.
Turf melting out begins as black to purple spots on the leaf blades. These spots eventually appear on the leaf sheaths. The fungus then begin to move down and invade the crowns and the roots of the plants. From far away, the turf appears yellow or blackish brown. The colors that appear on the turf directly reflect the nitrogen levels in the ...
Preventive fungicide applications are recommended when soil temperatures are between 55–60 °F (13–16 °C). Brown ring patch is not controlled by thiophante-methyl or other benzimidazole fungicides. [11] Fungicides can be applied in a water volume of 2 gal./1,000 sq. ft. and lightly watered in following application. [11]
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