Dead Patches on Lawn
Lawn grass is susceptible to a number of problems caused either by poor management or pathogens. Vigorously growing grass is generally more resistant to infestations and infections, as cited by the University of California Extension. A fungal infection is the likely cause of dead grass patches. Does this Spark an idea?
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Identification
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Lawn grass is susceptible to the dollar spot disease caused by the Lanzia and Moellorodiscus fungi. Turf grass under cultural stress or that is suffering from nitrogen deficiency is more prone to the disorder. Dollar spot is more prevalent between late spring and late fall.
Damage
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The disease is characterized by the appearance of 1- to 2-inch diameter, white to tan, dead spots on grass. With disease progression, the spots get larger in size and merge to form patches. Grass blades are initially water soaked then turn brown. Red bands are seen across the blades and threadlike, white fungal growth is visible earlier in the day.
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Control
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Keeping grass in good health with adequate nitrogen, water, air circulation and regular dethatching is among the best preventative strategies. Raise the mowing height and use recommended fungicides. These include iprodione and chlorothalonil.
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