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Suspected Pink Patch disease on backyard lawn #875343

Asked June 30, 2024, 1:27 PM EDT

Good afternoon. We live in the City of Delaware, Ohio and we most definitely have what I'm seeing described on the Internet as the pink patch disease. We have many questions. How did we get it? It didn't show up until about 8 early to mid May. Is it harmful to our 30 lb., 3.5 year old dog? She has never been a scratcher but almost at the same time we figured the pink patch disease appeared on our backyard lawn (where she plays and uses to eliminate) she started scratching very badly. She's now on an antihistamine and we're wondering if the lawn fungus could be causing it. She's also been exhibiting some lethargy and we're wondering if it's lawn fungus related. Are the brown lawn patches permanently dead grass that must be dug up and new dirt put in and then re-seeded? How to we get rid of the fungus that is present so that it doesn't kill our entire backyard? Thank you! Nancy

Delaware County Ohio

Expert Response

Understanding Pink Patch Disease

Pink Patch Disease is a fungal disease caused by the fungus Limonomyces roseipellis. It primarily affects cool-season grasses, including ryegrass, fescues, and Kentucky bluegrass.

How Did You Get It?

Pink Patch thrives in cool, wet conditions. It often appears in the spring and fall when temperatures range from 60 to 75°F and humidity is high. Contributing factors include:

  • Overwatering or poor drainage
  • Compacted soil
  • Excessive thatch
  • Poor air circulation
  • Low fertility, especially nitrogen
Is It Harmful to Your Dog?

Pink Patch disease itself is not known to be harmful to pets. However, the presence of mold and fungal spores in the grass might cause allergic reactions or irritations. If your dog started scratching at the same time the pink patch appeared, it's possible she could be reacting to something in the environment, including potential allergens from the fungus or other factors in the lawn. Lethargy might be a separate issue but could also be related to allergic reactions or another underlying health issue. It's best to consult with your veterinarian about her symptoms.

Lawn Treatment and Recovery

  1. Cultural Practices:
    • Reduce Watering: Water your lawn early in the day to allow it to dry before evening. Ensure the soil is not constantly wet.
    • Improve Drainage: Aerate the lawn to improve soil drainage and reduce compaction.
    • Mow Regularly: Keep the grass at the recommended height to prevent the fungus from thriving.
    • Remove Thatch: De-thatch the lawn to improve air circulation and reduce fungal habitats.
  2. Fertilization:
    • Apply a balanced fertilizer, particularly one that includes nitrogen, to promote healthy grass growth and recovery.
  3. Fungicide Application:
    • If cultural practices are not sufficient, you may need to apply a fungicide labeled for Pink Patch. Follow the manufacturer's instructions carefully.
  4. Reseeding and Lawn Repair:
    • Dead Grass: If the grass has died in patches, you may need to reseed. Remove the dead grass, loosen the soil, add new topsoil if necessary, and then reseed with a suitable grass seed mix.
    • Prevent Future Outbreaks: Maintain proper lawn care practices to prevent the recurrence of the disease.

Getting Rid of the Fungus

  1. Cultural Control: As mentioned, improving drainage, reducing watering, and regular mowing can help.
  2. Chemical Control: If necessary, use fungicides specifically designed for pink patch. Always follow label directions.

An Ask Extension Expert Replied July 01, 2024, 6:14 PM EDT

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