Following a parched and hot summer and a sharp plunge to cooler autumn temperatures, grass throughout Britain is battling with the dramatic shift. However, there’s an additional threat that lawns must confront as they head into the chillier months – and it can begin with revealing brown patches emerging.
Chris McIlroy, turf specialist at The Grass People, explained: “You might have grown accustomed to seeing the odd brown patch on dehydrated lawns in summer, but the issue can be just as prevalent at this time of year. That’s because Fusarium is a common lawn disease that emerges during the autumn.
“Knowing how to spot and address it can help keep your lawn healthy through the colder months. The disease presents itself as small, yellow and brown patches that expand.”
Fusarium, also recognised as Microdochium patch, is a fungal condition that becomes more widespread in late autumn and winter.
Mr McIlroy said: “The patches may also have thin layers of white or pink mould that looks like cotton wool, which spreads easily in damp conditions. Prevent this by aerating your lawn before the first frost to enhance drainage and reduce the risk of water pooling. Nitrogen-rich fertilisers can encourage grass growth, but this can make lawns more vulnerable to Fusarium. A balanced fertiliser is the best choice at this time of year.
“If you have a severe case of Fusarium, a fungicide might be necessary. But you should always follow guidelines closely and consult a lawn care professional if you’re not sure. Fungicides can negatively impact beneficial insects and microorganisms in the soil, which are important for a healthy ecosystem so you don’t want to use them unnecessarily.”
As we head into the colder months, it’s crucial to keep an eye out for Fusarium and take proactive steps to give your lawn a fighting chance against the challenges that lie ahead. However, Mr McIlroy suggests clearing leaves and other debris from lawns, and minimising footfall when the grass is vulnerable.
He advised: “Regular monitoring will pay off. Fallen leaves can trap moisture and create a perfect environment for fungal diseases. Minimising traffic on lawns is crucial, especially during wet or frosty conditions to avoid excess damage.”
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