Understanding Lawn Fungal Issues: How to Spot and Treat Fungus During Excessive Rain

If you’ve noticed your lawn isn’t looking its best after a particularly rainy spell, it might be battling a fungal invasion. Fungi thrive in wet, humid conditions, and excessive rain creates the perfect environment for them to flourish. But don’t worry – with a little know-how and some TLC, you can identify the problem and restore your lawn to its lush, green glory. Here’s what you need to know.

Common Types of Lawn Fungus to Watch For

1. Brown Patch:

This is one of the most common lawn fungi. It appears as large, circular patches of brown or yellowing grass, often with a darker outer ring. Brown patch thrives in warm, humid weather and can spread quickly if left untreated.

2. Red Thread:

Red thread is easy to spot, as it causes reddish or pinkish threads to appear on the grass blades. It’s more likely to develop in lawns with nutrient deficiencies, particularly low nitrogen levels, and often shows up in cool, damp weather.

3. Snow Mould (Fusarium Patch):

Snow mould can strike even outside of snowy conditions. It looks like white or pink cotton-like patches on the grass and is typically seen in cool, wet conditions after prolonged rain.

4. Dollar Spot:

This fungus creates small, round, sunken patches of straw-coloured grass, about the size of a pound coin. It’s common in closely-mowed lawns and can spread during humid periods.

5. Fairy Rings:

Fairy rings manifest as rings of darker green or dying grass, sometimes accompanied by mushrooms. They are caused by fungal activity in the soil and often signify a deeper issue with lawn health.

Signs Your Lawn May Have a Fungus Problem

1. Discoloured Patches: Unusual brown, yellow, or reddish areas appearing randomly or in patterns.

2. Mould or Threads: Visible mould, webbing, or thread-like structures on the grass.

3. Mushrooms: The sudden appearance of mushrooms, especially in circles or clusters.

4. Thinning Grass: Patches where the grass looks thin or weak despite regular care.

How to Treat Lawn Fungus

Once you’ve identified a potential fungal issue, taking action quickly can prevent further damage. Here are some steps you can take:

1. Improve Drainage:

Excessive rain often leads to waterlogged soil. Aerate your lawn using a garden fork or aerator to improve drainage and reduce standing water.

2. Adjust Your Mowing Habits:

Avoid cutting the grass too short, as this can stress the lawn and make it more susceptible to disease. Keep your mower blades sharp to ensure clean cuts.

3. Apply Fungicide:

Fungicides can be an effective way to combat lawn fungi. Choose a product suitable for your grass type and follow the instructions carefully. Always reapply as needed, especially during ongoing wet conditions.

4. Fertilise Wisely:

A well-fed lawn is less likely to succumb to fungal diseases. Apply a balanced fertiliser with nitrogen, phosphorus, and potassium to strengthen your grass. Avoid over-fertilising, as this can encourage certain fungi.

5. Clear Debris:

Remove fallen leaves, cuttings, and other debris from the lawn to prevent fungi from taking hold.

Preventing Future Fungal Problems

Prevention is better than cure, so adopt these habits to keep your lawn healthy year-round:

• Water Wisely: Water early in the morning so the grass has time to dry before nightfall.

• Aerate Regularly: Regular aeration prevents soil compaction and promotes healthy root growth.

• Overseed Thin Areas: Overseeding ensures a dense lawn, which is more resistant to fungi.

• Choose the Right Grass Type: Some grass varieties are more resistant to fungi than others. Consult with a lawn care professional if you’re unsure.

When to Call in the Experts

If the fungal problem persists despite your best efforts, it might be time to call in a professional lawn care service. Experts can diagnose the issue more precisely and recommend tailored treatments to bring your lawn back to life.

Excessive rain can be tough on your lawn, but with vigilance and care, you can tackle fungal issues head-on. By understanding the signs of lawn fungus and taking proactive steps to treat and prevent it, you’ll enjoy a healthy, vibrant lawn no matter what the weather brings.