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When to Apply Fungicide?

Last Updated: 02 April 2021

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Owning a green filled lawn can be exciting as well as challenging. You can proudly say that you own a lawn which pleases one’s senses. But, you also need to know the methods to take care of your lawn because it requires it. Lawns can get infected by diseases and the most common lawn fungus, and to treat this, you require lawn fungicide. You also need to be aware of when to apply fungicide on lawns. It’s significant to know should you water lawn after applying fungicide. These are crucial questions to which you need to know the answers so let’s get started.

Grass Fungus

What is Fungicide

Grass fungus is a fungal disease that can be visible as brown dead grass patches on your lawn. These discolored grass leaves are affected by fungal infection or disease, which is known as grass fungus. They spread fast but can be fully prevented or treated. There’s nothing to be worried about if you have the right lawn fungus control. After applying, you need to know if you can water the lawn after applying fungicide.

What is Fungicide?

The chemical compounds used to destroy parasitic grass fungus are fungicides. These are fungus killer for grass. And you need to know when to water the lawn after applying fungicide. These are to be known to have the best results after you apply the fungicide for grass. The fungicide attacks the fungi to destroy its energy manufacturing, and breathing, it destroys the cell membranes. Ultimately, the fungi die.

Different Fungicides

Contact Fungicide

Systemic Fungicide

This type of fungicide for lawn will stick to the grass blades giving it a protective sheath that obstructs the fungus from infecting the grass. It’ll be on the grass blades keeping the fungus at bay. But it won’t stay after a week, so you need to apply often. Now, if you water the lawn after applying fungicide then it’ll get washed from the grass blades and won’t be able to protect your lawn. So don’t water or walk on the grass after applying so best results. This type is used as prevention.

Systemic Fungicide

If you use this fungicide as your lawn fungus control measure, then it’ll be useful. It gets into the grass blades and protects the grass from within. You can apply as prevention or treatment for the disease, and it lasts longer. In this case, you can water after applying to make it work fully because the fungicide needs to reach the roots.

Common Fungicides in the U.S.A

Group Name Example Trade Name Systemic/Contact Mode of Action
Methyl Benzimidazole Carbamte (MBC) Mertect Cleary’s 3336 Systemic Obstructs cell functions in the fungus
Dicarboximide Meteor Systemic Obstructs cell function in the fungus
Demethylation Inhibitor (DMI): SBI class I Procure Fnginex Inspire Super Mettle Proline Systemic Obstructs cell functions in the fungus
Phenylpyrrole Maxim Medallion Contact Disrupts cell wall function in the fungus
Aromatic Hydrocarbon Koban Contact Treats and prevents soil borne fungal diseases
Phynyl-acetamide Torino Systemic Active against powdery mildew
Carboxylic Acid Amide Zampro Systemic Obstructs the formation of a cell wall in fungi

Time to Apply Fungicide

You need to be sure that the fungus is causing the discoloration before applying insect killer for lawns. If you find discolored patches with a powdery substance on the blades then you can go ahead. The grass can become slimy and can develop algae. Also, you need to know the type of infection on the lawn and then purchase the product to treat it. Grass leaves can be distorted or frayed in this case.

Should You Water Lawn After Applying Fungicide?

No, normally you shouldn’t. If you’re applying contact fungicide, which sticks to the blades, then you shouldn’t. You can water if you’ve applied systemic fungicide.

How to Treat Lawn Fungus Naturally?

  • Pour neem oil, compost tea, or baking soda on the infected patch.
  • Fertilize your lawn often.
  • Mow regularly.
  • Don’t walk on the infected patches.
  • Water as much as the grass needs.

Advice to Prevent Fungal Infection

Prevention is better than cure, so here are the preventive measures.

Advice to Prevent Fungal Infection
  • Give your grass the essential nutrients required to overcome this infection.
  • Watering is the key. Don’t water frequently but water so that it gets into the roots. Water in the morning to make the excess water evaporate all through the day.
  • Mow properly. Don’t cut the grasses too short as it weakens them. Never cut over 1/3rd of the grass.


Now you know the answer to the question – should you water lawn after applying fungicide! Keep the preventive measures in mind while taking care of your green grasses. Always remember that first use organic material and then shift to granular fungicide if it doesn’t work.

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