Zoysia Patch: How to Prevent and Treat It

What is Zoysia Patch?

Various fungal diseases can affect the health and beauty of your grass. But there’s one that explicitly targets zoysia grass. Zoysia patch is a type of fungus that preys specifically on zoysia grass.

Zoysia patch grows in the cool weather of spring and fall. It begins as small circles of 6 inches across and can grow as large as twenty feet in diameter. Patch interior becomes sunken and injured turf appears thin with a tan, yellow or orange color.

The orange firing of the expanding outer ring indicates active infection. While the fungus does not kill the roots of the zoysia grass, it may take months for affected areas to recover after proper treatment. Without proper fungicide treatment, the problem does not “go away” or “disappear.” It gets worse.

The best way to treat zoysia patch is to prevent it.

Zoysia patch

What Causes It?

Excessive thatch, compaction, and poor drainage conditions encourage fungus. Additionally, excessive watering in the fall will promote the disease as well. Because the fungus grows during slow-growing periods, in cooler, wet conditions, April and September are the months to watch out for this.

Tips For Preventing Zoysia Patch

Here are the steps you can take to help avoid this disease

  1. Always bag and remove clippings when mowing your zoysia grass lawn
  2. Core-aerate your lawn once a year to improve drainage
  3. Don’t mow when the grass is wet
  4. Water deeply once per week between 5-10 am
  5. Prune trees and shrubs to raise the canopy and improve light and airflow
  6. Maintain proper nitrogen levels, especially on damaged turf
  7. Resolve any drainage issues

Tips for Treating Zoysia Patch

As with all fungi, your best bet for treatment is to apply an effective fungicide at the first sign of trouble. There are several products available online and at your local gardening shops.

In addition to the preventative measures listed above, here are a few more things to consider:

  1. Use a fertilizer high in nitrogen to help discourage zoysia patch from setting in.
  2. Reduce shade coverage in your lawn by trimming trees and raising your yard canopy
  3. Don’t overwater your lawn. Excess moisture, especially in cool and shady areas, helps fungi thrive and spread.
  4. Keep your yard clean. A buildup of debris welcomes intruders, including bugs, algae, and fungi. Check out our leaf removal service page to find out how we can help.

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