Lawn Diseases
Blue-green algae
If black or dark green-black spots appear on the lawn, they are very often caused by blue-green algae (cyanobacteria). These tend to appear mainly dur...
How does a leaf spot disease develop?
There are various causes of leaf spot disease. Persistent moisture is one cause, but so are mowing the lawn too low or using a one-sided fertilizer. I...
Gray Snow Mold (Typhula incarnata)
Gray snow mold is also known as Typhula incarnata, Typhula rot, or white snow mold. It is a common winter lawn disease that occurs primarily during pe...
Root rot
Root rot occurs primarily in New Lawn Installation or Overseeding and is rather rare on established lawns.Causes of Root RotThe most common causes are...
How do red threads (“red tips”) form, and what can be done about them?
From a distance, the affected areas of the lawn usually look like brown or straw-colored patches. Upon closer inspection, however, you can see fine, r...
Root Rot (Pythium Rot)
Root rot, also known as Pythium, is often mistaken for drought damage at first. The lawn appears slightly bluish-gray and limp. One thing is certain, ...
How do I remove dew from the lawn?
Removing dew from the lawn is also known as dew-wiping, dew-stripping, or dew-removal. The goal is to remove moisture from the blades of grass in the ...
Fusarium (Brown Spots) in the Lawn—What Should You Do?
At first, irregular, light green patches appear on the lawn. Later, these patches turn straw-colored (reddish-brown). Since the lawn regenerates from ...
How do slime molds form?
Organic matter in the soil is usually broken down by a fungal network known as mycelium. When this fungal network appears on the surface, it takes the...
What are fairy rings, and how do they form?
Witch's rings are ring-shaped patterns that appear in the lawn. There are three different types, but they all have the same cause.Organic matter in th...
What is snow mold, and what can I do about it?
Snow mold (Latin: Microdochium nivale) is—contrary to what its name might suggest—not necessarily tied to frost or snow. The mushroom thrives especial...
Dollar Spots — Not as Nice as They Sound
So-called dollar spots (Latin: Sclerotinia homoeocarpa) are a typical summer lawn disease. They are primarily caused by heavy use of the lawn, such as...
Anthracnose
Anthracnose is a typical opportunistic pathogen that primarily infects weakened turfgrasses. The disease occurs mainly between spring and fall.The sym...
Lawn Rust
Lawn rust is a common fungal disease that occurs primarily during the summer months. It causes yellowish-brown pustules to form on the blades of grass...
Powdery mildew
If a whitish-gray, cotton-like, powdery, moldy coating appears on the blades of grass, it is a fungal disease of the lawn. In advanced cases, small bl...
Grey Leaf
The turf disease gray leaf spot (GLS) is rare in Germany. When it does occur, it is usually found on heavily used sports turf, such as in soccer stadi...
Welche Rasenkrankheiten gibt es?
Schneeschimmel(Microdochium nivale / Rosa-Schneeschimmel)Quellen: Rasenprofi - CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=4390...
Mold in the Lawn—How Does It Form, and What Can Be Done About It?
First, an important note:This article is about visible fungi in the lawn. In addition, the soil may also contain fungi that are not visible and only b...
Blackleg
There are various names for the fungal disease blackleg, such as Gaeumannomyces, Ophiobulus, and take-all patch.Blackleg is characterized by spots on ...
Brown Patch / Yellow Patch
Brown rot is caused by two types of pathogens with different temperature requirements. The optimal temperature for Rhizoctonia solani is 25–30 °C, com...