How do you treat fusarium on your lawn?
An article on what fusarium is and how it can be treated.

What is cold fusarium?

Cold fusariosis, also known as “fusariosis of cereals” or “root and stem rot”.
Is a fungal disease that affects plants, specifically grasses (i.e. lawns).

Symptoms of cold fusarium may vary depending on the plant affected.
They generally include :

. yellowing
. leaf wilting
. stem necrosis
. root rot
. reduced growth

Infected plants may also be more sensitive to environmental stresses such as drought and heat.

Cold fusarium is caused by fungi of the genus Fusarium, and can survive in the soil for several years.
Fungal spores are spread by water and wind and can penetrate plants through roots and leaf stomata.



Fungi appear to reduce excess organic matter in the lawn and promote the decomposition of roots and dead leaves.
They are an essential component of the soil and help maintain a healthy ecological balance in the lawn.
So you need to be able to think consciously about the treatment to be applied.

If fungal growth becomes excessive, this indicates excess organic matter in the lawn, poor irrigation or fungal disease.

To maintain a healthy and attractive lawn, it is necessary to correct these problems


Scanning the lawn

If your lawn has been in existence for more than two growing seasons, chances are you have warm-season grasses mixed in with cool-season grasses.
This combination of grasses can be confusing.
Because lawn care practices and treatments differ.
Warm-season herbs have different needs from cool-season herbs.

To improve the health of your lawn, aeration treatments can be an effective solution.
Core drilling involves making small holes in the lawn soil to allow air, water and fertilizers to penetrate the root zone of your lawn plants.
This improves soil aeration, which can prevent air and water circulation in plant roots, and promotes healthy root growth.

The technique can be performed using a lawn corer.
A specialized tool that drills holes in the ground at regular intervals.
Treatment can be carried out at different times of the year, depending on your lawn’s needs.
It is generally recommended to do this at least once a year.



Cold fusarium on grasses can also affect lawns.
Especially varieties such as English ryegrass and tall festuca.

Fusarium head blight in lawns is more common in wet, cold spring and autumn conditions.
It can spread rapidly across lawns via water droplets, shoes and gardening tools.

Measures to prevent cold fusarium in lawns include:

  1. Watering correctly:

    Avoid watering too often or too little.
    We recommend watering the lawn thoroughly once or twice a week.

  2. Mowing properly:

    Mow the lawn to an appropriate height (usually 5-7 cm) to encourage healthy grass growth.

  3. Avoid excessive trampling:

    Avoid walking on the lawn when it’s wet or when the temperature is high.

  4. Fertilizing correctly :

    Apply a balanced fertilizer to provide the nutrients needed for lawn growth.

  5. Avoid accumulation of fallen leaves:

    Remove dead leaves from the lawn to prevent moisture build-up and the spread of cold-blight.


Treatment of cold fusarium will depend on the severity of the infection and the plants affected.

Treatment measures include :

  1. Removal of infected parts:

    If cold-blight is confined to a small area, infected parts can be removed by cutting off affected stems and leaves.
    Infected parts should be disposed of in a plastic bag to avoid spreading the disease.

  2. Fungicides :

    The use of specific fungicides may be recommended to treat cold fusarium.
    Fungicides can be applied to the leaves and stems of affected plants to reduce the spread of the disease.

  3. Irrigation management :

    Reducing the amount of water used for irrigation can help reduce the spread of cold-blight, as it spreads easily in water-saturated soils.
    Irrigation management can also help prevent disease recurrence.

  4. Resowing :

    If the disease has caused bare patches, reseeding will be necessary to replace the affected areas.


It’s important to note that prevention is the best method of controlling cold-blight.

The key to a beautiful lawn is proper maintenance, which means following the recommendations for the care of different grasses.

What can Plaisir Vert do?

Initially, we were concerned about lawn maintenance at PLAISIR VERT.

Today, we can restore a lawn in poor condition, but we strongly advise against spot treatments.

The best approach is to ensure regular maintenance and follow-up to avoid this problem.

Our regular lawn care subscribers don’t have to deal with this fungal disease.