Have you ever noticed a fine, spider-like web across your lawn early in the morning and wondered what it is — and whether it’s harming your grass? In this blog, we’ll explore what Mycelium is, why it shows up on your lawn, and when (if ever) you need to take action.
Before we understand Mycelium, it’s important to know what Hyphae are. Hyphae are the thin, thread-like filaments of fungi that absorb nutrients by breaking down organic material. These microscopic structures seek out and penetrate food sources, releasing enzymes to aid in digestion.
Mycelium is essentially a network or bundle of Hyphae clustered together. While Hyphae are too small to see with the naked eye, Mycelium can often be seen on the lawn, especially in the early morning.
Fungi that form Mycelium include molds, mushrooms, and many types of pathogenic fungi. Some yeasts, however, do not produce Hyphae or Mycelium.
When present in your lawn, Mycelium appears as a web-like, cottony structure. It can be found on the grass blades or just beneath the surface.
Fungal growth thrives under certain conditions such as:
Overwatering
Poor drainage or compacted soil
Improper mowing techniques
Humid or damp weather
Common signs of fungal activity include:
Web-like Mycelium visible in the morning
Grass blade discoloration
Uneven texture in the turf
Wet, slimy, or greasy-looking patches
Powdery coatings on the grass
Several common lawn diseases may present with visible Mycelium, including:
Dollar Spot
Pythium
Fairy Ring
Winter Fusarium
Brown Patch
The presence of Mycelium itself usually isn’t harmful and doesn’t always require treatment. However, if you notice additional symptoms like discoloration, thinning, or patchiness, it may indicate a more serious fungal issue.
To reduce fungal growth naturally:
Cut back on irrigation
Improve air and light penetration
Aerate compacted soil
These steps often reduce disease severity without chemical intervention. But if the issue persists, you may need to apply a fungicide.
For diseases like Anthracnose, Brown Patch, Winter Fusarium, Leptosphaerulina, Curvularia, and Dollar Spot, a broad-spectrum fungicide such as Tombstone is recommended.
For Helminthosporium, Fusarium, Rhizoctonia, and Grey Leaf Spot, try a water-dispersible fungicide like Mancozeb.
Let us know if you’re unsure which product is right for your lawn — or if you’d like tips on improving your lawn’s resilience to fungal disease.
Contact our team for expert advice email or call 1800 473 363
