How to Prevent and Treat Lawn Diseases

Learn how to prevent and treat lawn diseases with these practical tips. Regular lawn care and proper maintenance, including watering, mowing, and fertilizing, can help keep your lawn healthy and disease-free.

Common Lawn Diseases and Their Symptoms

Maintaining a healthy lawn requires proper care and attention. But even with regular watering, fertilizing, and mowing, there are times when your yard may fall prey to disease. When not addressed quickly, these diseases can turn your lush green grass into a brown, unsightly mess.

Here are some common lawn diseases and their symptoms:

Brown Patch

Brown patch is a fungal infection that thrives in hot and humid weather conditions. It typically appears during the summer months when temperatures rise above 80°F and humidity levels are high.

  • Irregular-shaped patches of brown or yellow grass appear on the lawn.
  • Grass blades in these patches will have a dark ring around them.
  • The infected grass may wilt or collapse when stepped on.
  • Fungal growth may be visible in early morning dew on the infected areas.
  • Avoid overwatering as it creates an ideal environment for fungi to grow.
  • Water lawns early in the morning so that it has plenty of time to dry-off during warm conditions.
  • Mow lawns at recommended heights for different types of grasses as shorter lengths increase exposure to heat stress and fungal infections.
  • Apply fungicide treatment according to manufacturer instructions before initial symptoms emerge.

Dollar Spot

Dollar spot attacks all types of turfgrass but is most prevalent on bluegrasses, ryegrasses, fescues, Bermuda grasses, and bentgrasses where there’s poor water management. This fungus gets its name from the silver dollar-sized spots that can appear throughout your yard.

  • Small circular patches ranging from 1 – 5 inches (2.5 – 12 cm) diameter become visible on the leaves.

  • These patches have tan colored centers surrounded by reddish-brown edges.

    Affected areas will look sunken-in compared to surrounding patches of perfectly healthy lawns.

  • Provide adequate moisture to your lawn by watering deeply instead of frequently.
  • Avoid letting the soil remain damp during cooler months because this is when this disease spreads rapidly.
  • Encourage good air circulation throughout your yard, especially if it is humid or has poor drainage that tends to form water stagnation in some spots. Aerate the lawn by creating holes about four inches apart with aerators or thin tines early every year (like early spring) for warm-season grasses and late summer or early fall for cool-season ones. This reduces organic matter buildup, improves soil compaction, and ultimately prevents fungal growth.
  • Apply pesticides labeled for dollar spot before symptoms appear.

Fairy Ring

Fairy Rings are caused by various fungi that control grass roots’ growth leaving green circular rings or arcs on the surface of your lawn. These rings can grow up to several meters in diameter that will require serious attention.

  • Circular patches of dark green grass banding outward turn into light tan color bands.

  • The edges of patches may produce mushrooms and other types of fungal fruiting bodies.

    A ring structure develops with uneven height differences over affected areas.

  • Keep lawns well-aerated all-year-round with annual clean-up practices like removing dead leaves plant debris, mowing regularly at recommended heights, avoiding nutrient-rich fertilizers applied in high amounts only to specific spots within stressed areas (overfertilization).
  • Treat these unstable areas with fungicides as directed by instructions given on product labels.


Rust can be found throughout most regions across North America. It appears during late Summer through Fall and weakens your lawn’s ability to photosynthesize effectively.

  • Yellowish-orange colored powder-like substance begins appearing on blades and clothing whenever you pass over them or touch them.

    Grass blades become dry and brittle due to a dropped chlorophyll level due to lowered sugar production associated with photosynthesis.

  • Applying slow-release nitrogen fertilizers in the correct amount during lawn transitions weakens Rust from developing.
  • Keeping the soil well-thatched and regularly cultivating it can weaken rust development.
  • Apply a fungicide deemed necessary by label instruction, if rust appears.

Knowing how to tell when your lawn is diseased and showing signs of illness as early as possible saves time, money, and effort. Take these symptoms to prevent these conditions from weakening or destroying lawns by consulting a professional landscaper or garden center personnel to seek proper advice on what to do next.

What is Lawn?

A lawn is an area of land planted with grasses that are kept at a short height through regular mowing. [Wikipedia]

Proper lawn care practices to prevent diseases

A well-maintained lawn can enhance the curb appeal of your home and provide a relaxing outdoor space for you and your family to enjoy. However, maintaining an attractive lawn requires more than just regular grooming and watering. Certain lawn diseases can damage or even kill your grass, and once they take hold, they can be difficult to eradicate. Fortunately, there are steps you can take to reduce the likelihood that diseases will strike your turf.


Mowing is one of the most basic aspects of lawn care, but it plays an important role in preventing diseases. When grass blades are left too long, they create a dense canopy that traps moisture and provides an ideal environment for fungi to flourish. Regularly mowing your lawn helps keep the grass at a healthy length so that air and sunlight can penetrate down to the soil surface.

How to mow
  • Always use sharp mower blades so that you create clean cuts rather than tearing the grass.
  • Adjust the height of your mower according to the type of grass you have.
  • As a general rule, cool-season grasses like Kentucky bluegrass should be kept at 2-3 inches while warm-season varieties like Bermuda grass should be maintained at around 1 inch.
Mowing frequency

The exact frequency at which you need to mow your lawn depends on factors such as climate, rainfall, soil type, and grass species. As a general rule of thumb though:

  • During periods of high growth (usually in spring), you may need to mow once every five days or so.
  • In late fall when growth slows, once every ten days may suffice.


Proper watering is another critical factor in keeping your lawn disease-free. Too little water leads to drought stress which weakens the plants’ immune systems making them more susceptible to fungal infections. Too much water creates conditions conducive for fungus growth. It is therefore necessary to strike a balance.

Proper watering techniques
  • Water your lawn in the morning when the air is cool, and there’s less chance of evaporation.
  • Water deeply and infrequently to promote deep rooting. When you do water, apply enough water to wet the soil to a depth of at least 6 inches.
  • Avoid overwatering as too much moisture leads to anaerobic soil conditions which can lead to root rot.
Watering frequency

Again, the correct frequency depends on many factors like climate, rainfall, soil type, etc. As a general rule:

  • Your lawn needs about an inch of water per week including rain and irrigation.

  • You can measure how much water your sprinklers are applying by placing small containers like soup cans around your lawn while you’re irrigating and timing how long it takes for them to fill up with an inch of water.

    During drought periods or heatwaves, increase this amount.


Fertilizing provides essential nutrients that grass requires for growth and healthy development. A well-fed lawn is more resistant to diseases than one that has undernourished plants.

Types of fertilizer

There are two main types of fertilizers: organic sources derived from natural materials such as bone meal or blood meal and synthetic fertilizers manufactured chemically such as ammonium nitrate.

Organic fertilizers provide slow-release nutrients but have their limitations – they tend not to add all macro-nutrients such as nitrogen that plants need so supplementation may still be required. Synthetic fertilizers typically contain higher levels of nitrogen promoting rapid growth but providing solely synthetic meals may alter long term microbial ecosystem health in the soil leading overuse instead.

Application frequency
  • The most ideal times for fertilizing grass depend on grass varieties.

    Spring fertilizer should usually be applied in early April before the onset of weed growth accompanied by Fall application usually carried out between September and November depending on region.


Despite adequate hydration, nutrients and frequent mowing, a lawn with significant foot traffic may experience soil compaction which could be detrimental to the health of turf. Prolonged soil compaction leads to nutrient deficiency as nutrients are locked in inaccessible forms.

Benefits of aerating

Aerating tackles this issue head-on by loosening compacted soil all while improving air circulation and allowing water, fertilizer, and oxygen deeper into the roots where they can do their work. Core aerators designed specifically for lawns remove small plugs of turf allowing air to infiltrate around the roots so plants can access more oxygen promoting healthy root growth.

How to aerate
  • Water your lawn thoroughly 1-2 days before you plan then mark out any irrigation system heads or buried cabling
  • Attach an aerator tool insert onto your manual push mower firmly a featured settings level bar component defining prep work on size diameter core desirable
  • Optimal conditions typically require that snow has melted from frost conditions or rainfall occurred for at least a day prior to scheduling.
  • In regular recommended intervals of no more than 3 years

Preventive care is better than trying to cure your lawn after an outbreak but should it occur professional help should come in handy since early detection provides opportunity improve treatment outcome. Carefully observe lawn regularly for abnormal patches discoloration or grass blades that look stunted fungal diseases usually show up first in low areas of lawns where drainage is poor so keep an eye. By following proper maintenance practices above any infestation should be kept off from ever occurring on your beautiful luxurious lawn.

Understanding the importance of soil health

Maintaining a healthy and lush lawn involves more than just watering and mowing on a regular basis. In fact, it all starts with the soil that your grass is rooted in. Achieving healthy soil first requires an understanding of the various components that make it up, as well as its nutrient content. Additionally, testing of the soil can reveal important information about its pH level among other factors, which can directly impact your lawn’s overall health.

Soil components

Before diving into the specifics of why soil is so important to lawn care, it’s essential to understand what goes into the makeup of this material. While different soils naturally contain varying amounts of each component type depending on regional elements like geography and climate, these are generally defined to contain:

Types of soil
  • Sand: Coarse structure that drains moisture rapidly
  • Silt: Moderately coarse structure with moderate drainage capabilities
  • Clay: Fine-grain structure with limited drainage

Soil types can cause problems when they are excess or deficient in some component leading to poor performance by plants grown in them.Understanding your local type can guide you how best to maintain your lawn.


In addition to these basic texture distinctions, soils also consist out minors such as:

  • Nitrogen,
  • Phosphorus,
  • Potassium

Each element plays a critical role in a plants’ growth process. For example nitrogen helps promote greener leaves whilst potassium promotes root system development.

Ensuring each element is available in quantities appropriate for plant need fortifies healthy growth from season to season.

Testing soil

Importance of testing

Whilst maintaining your lawns properties may seem challenging at times, doing so becomes easier if you have an idea about your specific environment requirements.Therefore it makes sense then why regular soil testing is essential; A test helps determine levels of any mineral deficiencies you may be dealing with, further informs adjusting from fertilizers to improve growth.

Consistent testing not only acts as a safeguard against insufficient nutrients, but it can also help prevent overuse of unnecessary additives that can hurt soil composition.

How to test

Two common ways to perform soil testing are:

  • Home Test kit: These kits come with DIY instructions allowing users easily be able to test their own soil at home
  • Professional Soil Lab: For more sophisticated tests results such as detailed environmental comparisons nutrional uptake ratios etc a professional soil lab may be the better option.

Commonly used techniques for analyzing soils through scientific means include:

  • ‘Triangular’ Phosphorus buffering capacity,
  • Nutrient availability measures
  • Mean Weighted Diameter evaluation

Soil testing should typically occur annually during periods of most lawn use. The best time is eight weeks prior growing season or according to specific territory’s farmer calendar.

By regularly checking moisture levels, nutrient content, and pH balance in your lawn’s soil, you have a greater chance at keeping your grass healthy year round. Making adjustments based on annual tests and taking initiative throughout regular maintenance practices helps make sure your yards stay green all year long.

Chemical vs organic treatments for lawn diseases

When it comes to dealing with lawn diseases, you have two main options: chemical and organic treatments. Each approach has pros and cons that you should weigh carefully before deciding which one to use.

Chemical treatments

Chemical treatments work by using synthetic substances to kill off the organisms that are causing the disease in your lawn. There are several types of chemicals commonly used for this purpose, including:

Types of chemicals
  • Fungicides: These are chemicals that specifically target fungi, which can cause diseases like pink patch and dollar spot. They work by disrupting the growth of the fungus or killing it outright.
  • Insecticides: Some lawn diseases are caused by insects, such as grubs or chinch bugs. In these cases, insecticides may be necessary to get rid of the pests and stop them from spreading the disease.
  • Herbicides: While not strictly used for lawn diseases, herbicides can be an important tool in protecting your lawn from certain plant pathogens that can cause issues like root rot.

While chemical treatments can be highly effective at stopping the spread of a disease, they also come with some downsides:

Safety concerns
  • Toxicity: Many chemical treatments used on lawns are toxic to people and animals if ingested or absorbed through the skin. Proper protective gear should always be worn when applying chemical treatments.
  • Environmental impact: Chemicals used on lawns can leach into groundwater or run off into nearby water sources. This can harm wildlife and contaminate drinking water supplies.
  • Cost: High-quality chemical treatments can be expensive, particularly if you need to treat a large area repeatedly.

Ultimately, whether or not to use chemical treatments on your lawn is a personal choice. If you do decide to go this route, make sure you follow all safety guidelines and find products labeled as low-toxicity wherever possible.

Organic treatments

If you’re looking for a more natural way to deal with lawn diseases, organic treatments may be the way to go. These options work by using substances found in nature to control or prevent disease.

Natural remedies

Natural remedies can include things like compost teas, which are made by steeping compost in water and then spraying it on your lawn. The beneficial microbes contained in the compost can help fight off disease-causing organisms and promote healthy growth.

Another option is to apply cornmeal or corn gluten meal to your lawn. These products have been found to suppress some types of fungi and other pathogens. Some people swear by the power of garlic oil or neem oil sprays as well – these natural oils can have anti-fungal and insecticidal properties.

DIY remedies

Finally, if you’re feeling adventurous, you might try making your own lawn treatment solutions at home. There are many recipes online for things like vinegar sprays (which can kill weeds), baking soda mixes (which fight off fungal diseases), and even homemade compost tea recipes.

While organic treatments are generally considered safer than chemical options, they too come with their own set of limitations:

  • Effectiveness: While some natural treatments can be quite effective against specific diseases or pests, others may not work as advertised.
  • Preparation time: If you’re making your own organic treatments from scratch, it can be time-consuming to gather all the ingredients and prepare them correctly.
  • Limitations: Some diseases simply cannot be treated effectively with organic methods alone. In these cases, chemical treatments may be necessary.

At the end of the day, choosing between chemical and organic treatments for your lawn diseases depends on several factors. You’ll need to weigh factors such as safety concerns, effectiveness of treatment, environmental impact, cost of products etc carefully before deciding what method suits you best.

When to call in a professional lawn care service

Lawn diseases can be frustrating and can take a toll on the beauty of your lawn. Most homeowners may prefer to handle the problem themselves, but sometimes it’s best to call in a professional. Here are some signs that it’s time to call in a professional lawn care service:

Signs it’s time to call a professional

Identification of diseases

It can be challenging for an average homeowner to identify various lawn diseases and differentiate them from other problems such as pests or poor soil quality. Some common types of diseases that affect lawns include brown patch, dollar spot, and rust disease. A misdiagnosis can lead to the use of ineffective treatments which prolong the problem.

Severity of diseases

Lawn diseases tend to spread quickly and if left untreated they can cause extensive damage. If you notice large patches or areas of dead grass, this could be an indication that the disease has progressed too far for DIY solutions.

If you have attempted DIY treatments without success and do not possess the skills required for diagnosis, it’s time to contact a professional.

Choosing the right professional

Researching options

Choosing the right lawn care company can make all the difference in how your lawn is treated. It’s essential to choose a reputable company with expertise in diagnosing and treating lawn diseases.

Before settling on one particular company, take time searching for options. Check customer reviews on websites such as Angie’s list or Yelp, ask friends, relatives or neighbors who among them use similar services.

Establish whether they are licensed by regulatory agencies such as Environmental Protection Agency (EPA), it ensures their methods will not do more harm than good.

Questions to ask

After identifying some potential companies, get more specific information by asking questions regarding their treatment methods:

  • What method(s) do they use?
  • Is there any guarantee?
  • How experienced are their technicians?
  • Are they insured?
  • What is their course of action if the treatment does not work?

Their answers will help you choose the company that best suits your needs.

Calling in professionals will give you peace of mind knowing your lawn is being treated appropriately, and any underlying issues that can cause recurring problems, like poor soil quality or pests.

The role of proper irrigation in preventing lawn diseases

Maintaining a lush and healthy lawn requires plenty of water, nutrients, and sunlight. While it may be tempting to overwater your yard during the hot summer months, doing so could actually lead to a variety of lawn diseases that stunt growth or even kill off your grass. Proper irrigation is essential for preventing these issues.

Benefits of proper irrigation

Before we dive into specific tips, let’s discuss some of the benefits that come with proper irrigation:

Water penetration

If you’re not watering your lawn correctly, it’s likely that moisture isn’t penetrating down to where it’s needed most: the roots. Without sufficient moisture at the root level, grass becomes weak and more susceptible to disease and insect damage. Proper watering allows moisture to soak deep into the soil, creating a strong foundation for your turf.

Nutrient distribution

Water is also crucial for distributing nutrients throughout the soil. When there isn’t enough water present, nutrient levels decrease rapidly, making it difficult for plants to grow and thrive. By contrast, when an adequate amount of water is present in the soil, plants can absorb necessary nutrients through their roots.

How to ensure proper irrigation

Now that we’ve established why good watering practices are important let’s look at ways to achieve them:

Sprinkler system maintenance

One common mistake homeowners make is assuming that their sprinkler systems are working properly without performing regular maintenance checks. It’s essential to make sure all sprinkler heads are free from clogs or other blockages; otherwise, certain areas of your yard will not receive enough water while others are overwatered. If you notice an issue with any part of your sprinkler system – like low pressure or damaged sprinkler heads – address it promptly before it can cause more significant problems.

Watering schedule

Another important factor is having a regular watering schedule. The frequency and duration of your watering will depend on several factors, including the type of grass you have, the time of year, and your local climate. A good rule of thumb is to water deeply and infrequently. Most types of grass require about 1 inch of water per week, which can be achieved through one deep watering or multiple shorter sessions throughout the week. Keep in mind that too much watering can be just as harmful as too little since it can cause root rot and other diseases.

In addition to determining how frequently to water, consider what time of day to do so. Early morning is usually best since it allows moisture to soak into the soil before evaporation from the sun takes place; this way, less water is wasted overall.

Ensuring proper irrigation takes work and effort on your part but is worth it in exchange for a healthy lawn that looks great all year long!

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