Fungus, Mold, and Mildew… Oh My!

There are many things that can ruin our lawns, from pests to Mother Nature, but trifecta of destruction can be done by fungus, mold, and mildew! Yuck. Lawn fungal diseases can take on a variety of forms, from dark brown patches to slimy moldy looking areas. None of it is healthy and should be dealt with to get your lawn back to a healthy state. Let’s take a look at some common fungal diseases that can harm your lawn, as well as what could be the root cause of them.


Common Fungal Diseases


  • Brown Patch is a turfgrass disease that is caused by the Rhizoctonia species of fungus and tends to strike during hot, humid weather. It is one of the most destructive lawn diseases as it can destroy large areas of turf virtually overnight when the weather conditions are just right. The disease begins to show growth when temperatures reach 65°, but the most active growth of brown patch lawn disease occurs at temperatures of 80-85° when humidity levels are very high. The appearance of large swaths of brown patches are usually the first sign of the disease that homeowners notice.
  • Fusarium Blight is also known as Necrotic Ring Spot and is a devastating, soil-bound disease that is most noticeable and damaging during the prolonged hot, dry conditions of summer. This disease first appears near sidewalks, driveways, and on areas with direct sunlight. This disease may appear as a round area of dead grass with a small area of thriving grass in the middle.
  • Dollar Spot develops in a distinct circle about the size of a silver dollar. This disease tends to occur when nights are cool and the dew is heavy. Excessive thatch and high humidity also gives rise to this disease.

Causes of Lawn Fungus

Your lawn is naturally full of mold, spores, and fungi of all different types. Most of this is harmless unless conditions become ripe for disease growth. Conditions that can cause this include:

  • High levels of thatch and soil compaction
  • Drought
  • Overwatering
  • High humidity for extended periods of time
  • The wrong amount or type of fertilizer


Do you suspect that the rings, brown spots, thin patches, or slimy areas may be fungus, mold, or mildew growing in your lawn? Call Pro-Tech Lawn Care at (603) 382-9644 or Toll Free: (800) 313-4733, or visit our website to schedule an appointment.

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