Having a healthy lawn is more than a badge of pride for us. 

It’s a safe place for our kids and pets to play (and it’s why we’re always the first ones asked to host holidays and weekend barbeques). 

So when our lawn starts showing signs of diseases, we move quickly.

We like to say that when you own (or rent) a home, you’re a farmer. 

So it’s time to get familiar with these 5 lawn diseases in Florida yards— because they can severely disrupt your yard’s ecosystem.

RELATED: Top 7 Common Lawn Weeds in Florida & How To SAFELY Remove Them

1. Brown Patch

Brown patches in Florida lawn

This fungal disease is favored by Tampa’s warm and humid conditions. It creeps in, creating these irregular brown or tan circles on your grass. It can spread quickly

Spotting Brown Patch:

  • Brown or tan circular patches.
  • A smoky ring thing at the outer edge.


  • Drain that soil better to keep the fungus away.
  • Bust out the organic fungicides with neem oil or copper.

2. Dollar Spot

dollar spot in Tampa yard

The tiny but potent Dollar Spot strikes when nitrogen levels are low, and humidity surrounds your grass blades. It starts off as a singular circle (about the size of a silver dollar), but can also spread pretty quickly. 

Spotting Dollar Spot:

  • Small, silver-dollar-sized brown or straw-colored spots.
  • During the morning, you might observe the presence of white, cotton-like fungal threads (mycelium) on the affected grass blades. 


  • Pump up the nitrogen with organic fertilizers.
  • Give your grass blades some air by mowing to the proper height, addressing thatch buildup, or trimming overgrown vegetation.

3. Root Rot

root rot

Root rot occurs when soil remains consistently waterlogged, depriving plant roots of oxygen. 

This lack of oxygen leads to fungi growth, which attack and rot the roots, compromising the plant’s ability to absorb nutrients and water.

Spotting Root Rot:

  • Yellowing and wilting of grass.
  • Roots going black and smelling funky.


  • Toss some organic matter into your soil for better drainage.
  • Bring in the beneficial nematodes to kick out those harmful fungi.

RELATED: 7 Best Grass Types in Tampa, Florida Based on Your Type of Lawn

4. Gray Leaf Spot

gray leaf spot

Picture from UF

Gray Leaf Spot is a disease that happens when you overwater, leaving your grass blades with those weird gray lesions. 

Spotting Gray Leaf Spot:

  • Gray, elongated lesions on grass blades.
  • Tips of your grass looking sad and turning brown.


  • Stop with the overwatering and water early in the day.
  • Grab some organic fungicides with neem oil or potassium bicarbonate.

5. Fairy Ring

fairy ring in Tampa, Florida lawn

Fairy Ring happens when certain fungi in the soil break down organic matter, releasing nutrients that make grass grow in circles or rings. 

It’s like a natural dance of fungi and grass, leaving behind these mysterious circles in your lawn.

Spotting Fairy Ring:

  • Circular rings of dark green or dead grass.
  • Mushrooms or puffballs show up like they own the place.


  • Let your soil breathe – aerate and dethatch.
  • Add more compost or be more consistent with your organic fertilizer.

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What are the signs of lawn diseases in Tampa?

Watch out for:

  • Funky brown or tan circles (Brown Patch).
  • Silver-dollar-sized brown spots with morning mycelium (Dollar Spot).
  • Grass wilting with blackened, rotten roots (Take-All Root Rot).
  • Gray, elongated lesions on grass blades (Gray Leaf Spot).
  • Rings of dark green or dead grass with mushroom friends (Fairy Ring).

How do you treat lawn diseases organically in Tampa?

Fight back with:

  • Better soil drainage and organic fungicides (Brown Patch).
  • Nitrogen-packed organic fertilizers and more airflow (Dollar Spot).
  • Organic matter for soil drainage and nematode backup (Root Rot).
  • Smart watering and organic fungicides (Gray Leaf Spot).
  • Aeration, dethatching, and microbe boosters (Fairy Ring).

Lawn diseases on your Tampa turf can be frustrating, especially if it’s like your kids’ second bedroom or you have people over often. 

Just keep a vigilant eye and keep those organic fertilizers and fungicides handy for a quick fix. 

Keep it green, my lawn-loving friends!

Keeping your lawn disease-free isn’t so easy, is it? Call us to do the dirty work for you!