December 05, 2018 | Lawn Care Tips

List of Lawn Diseases: Identification – a full guide

List of Lawn Diseases: Identification – a full guide

List of Lawn Diseases: Identification – make the most of this highly informative guide. To protect your plants from various diseases you need naturally know about these hazards as much as possible. In this review, you’ll find detailed information on the subject.

List of Lawn Diseases: Identification – learn to fight common lawn diseases

Sometimes even the healthiest lawns face common lawn problems. One of those issues is a rich variety of grass diseases. Many homeowners aren’t aware of numerous grass fungus types and it makes them less prepared to withstand them in their lawns. That’s why it makes sense for you to utilize our identification chart to learn more about common lawn fungus.

A great number of lawn diseases are difficult to identify and to distinguish from other issues, including poor maintenance or pests. Just ask anybody who has already faced lawn diseases and you’ll be told how frustrating and terrible their experience was.  Well, like human diseases, lawn ones can be difficult to precisely diagnose and even harder to treat in the proper way. Keep reading this review to learn how to properly identify and handle your lawn issues.

Most probably, you already have a lawn disease or even several ones. If so, then the most common option is to utilize a fungicide. However, before you rush to the nearest nursery, keep in mind that fungicides can’t be a panacea for all your lawn issues.

The matter is that some diseases are immune to fungicides. On the contrary, they respond to a number of improved cultural changes, including alternative mowing practices, or changing the way the plants are watered. Moreover, planting resistant grass varieties to certain types of grass diseases might be the ideal solution.

The main thing is to properly identify the disease before coming up with a remedy to cure it. Well, a couple of lawn diseases, such as red-thread are evident in their identification. Unfortunately, other lawn diseases are very similar in appearance and therefore need alternative methods of treatment.

Ideally, without any experience in this field, you should consult an expert who has decent expertise in identifying common grass diseases. That’s a local lawn care provider. It’s apparent they have learned through the corresponding certification what lawn issues look like and how to handle this stuff. Reach out to them without delay because some lawn diseases need to be treated as soon as they’re spotted.


If you’re absolutely assured you know what grass disease has infected your garden, you may certainly consider utilizing a fungicide. You’d better avoid sticking with this solution because fungicides are what should be employed only by professionals, as they’re properly trained to make use of it. What’s more, fungicides are prone to developing a resistance to these chemicals after the repeated use. As a result, it’s getting harder to control grass diseases even with adequate treatment.

As a matter of fact, there’re three major types of fungicides.

  • Contact fungicides: Once utilized, they stay on the plant’s surface and terminate spores coming in contact with it.
  • Systemic fungicides: Once applied to the leaves, they start moving throughout the circulation system of the plants including their roots. They boast a longer residual lifespan compared to contact types.
  • Penetrant fungicides: They have much in common with systemic ones, but they act as a preventative treatment to cease the surge of pathogens.

Lawn diseases: description, prevention and treatment

We’ve have done a big job to make a full list of typical lawn diseases, so you could know how to distinguish and treat them.

Snow mold

  • Description: It often affects Fescues and Kentucky Bluegrass in areas where snow falls and stays on the lawn for a long time.
  • Prevention: To prevent this disaster, you require aerating your lawn on a regular basis. Improving water drainage, regularly raking leaves off your lawn’s surface, and also sticking with a fertilization schedule to avert over-fertilization in the late-fall will undoubtedly help.
  • Chemical treatment: Benomyl.

Brown Patch

  • Description: It often affects Kentucky Bluegrass, Bermuda, Centipede Grass, St. Augustine, Bent Grass as well as ryegrasses in areas with high humidity or shade. The disease usually begins as a tiny spot and can rapidly spread outwards in a horseshoe or circular pattern up to several feet wide. The inside of the circle can recover, when expanding outwards, leaving the brown areas, which are similar to a smoke-ring.
  • Prevention: Keep aerating your lawn. Shade to affected areas needs to be reduced. You require following a fertilization schedule to avert fertilization with too much nitrogen.
  • Chemical treatment: Chlorothalonil and Benomyl.

Dollar Spot

  • Description: The given disease often impacts Kentucky Bluegrass, Bermuda, and Bent Grass in humid areas. As its name suggests, it looks like a tiny silver dollar-like shape. However, it can turn into a small grapefruit. As a rule, it’s straw-colored or brown.  The spots can merge to create huge patches a couple of feet wide. The disease often shows up during wet, warm, and dewy weather. A low level of nitrogen is another factor, which favors this lawn disease.
  • Prevention: Don’t forget to aerate your lawn. You’d better water it in the morning if extra water is required.  Get rid of excess thatch. You require sticking with a fertilization schedule to ramp up the amount of nitrogen in your lawn.
  • Chemical treatment: Benomyl, thiophanate, or anilazine. You require making two applications of a contact fungicide. You need to do it 7-10 days apart, starting when the grass disease has just shown up. Damaged grass will undoubtedly recover if you treat it right now.

Fairy Rings

  • Description: It can affect most plants. It can be diagnosed by circular rings, which are filled with, dark-green, fast-growing grass. Additionally, around the ring’s perimeter, the grass often becomes brown and mushrooms spring there. By the way, these rings typically show up in soils containing old decaying tree slumps or wood debris.
  • Prevention: The diseased area needs to be aerated. Have your lawn watered well in the morning. Excess thatch needs to be removed. Stick with a fertilization schedule to spur the amount of nitrogen in your lawn.
  • Chemical treatment: Nothing is recommended.


  • Description: The given disease has an impact on leaf blades. As a rule, it affects ryegrasses as well as Kentucky Bluegrass. Rust prefers shade, morning dew, low-fertility, and high soil compaction. In order to identify a rust issue, you need to take a paper towel and rub several grass blades through it. Well, if an orange color is still there, it’s rust for sure.
  • Prevention: Have your lawn regularly aerated. You need to water it well in the morning. It’s up to you to diminish shade to grass. You require mowing more frequently and bagging grass clippings. Keep to a strict fertilization schedule to ramp up the overall amount of nitrogen in your garden.
  • Chemical treatment: Anilazine and Triadimefon. Apply it every 7 – 14 days to reach a definite improvement.

Grease Spot / Pythium Blight

  • Description: It has an impact on all plants in humid climates. You can diagnose it by the slimy-brown patches, which often have a cotton-like, white fungus around it.
  • Prevention: Keep aerating your garden. You should have your plants watered only in the morning. You need to immediately get rid of excess thatch. Besides this, you require reducing shade on the lawn and cutting the nitrogen levels when conducting fertilization.
  • Chemical treatment: Metalaxyl.

Red Thread

  • Description: It usually affects Fescues, Kentucky Bluegrasses and Ryegrasses in moisty and cool weather. The affected plants become brown. The disease impacts only leaves as well as leaf sheaths. Fortunately, it’s unable to have your lawn killed. It’s mostly visible in wet weather.
  • Prevention: Regularly aerate your lawn and remove thatch. Keep mowing your lawn. Additionally, you require reducing shade on your garden. Don’t forget to keep to your fertilization schedule. Ensure to have potassium and nitrogen included.
  • Chemical treatment: Chlorothalonil. Apply the chemical at intervals of 7-10 days.

Powdery Mildew

  • Description: The disease looks as if it’s sprinkled with flour. The most vulnerable plants are Kentucky bluegrass and those growing in shade areas. It makes plants wither and then die.
  • Prevention: Allocate only morning hours to have your lawn watered. Minimize shade by simply aerating, pruning, and checking drainage in the area.
  • Chemical treatment: Fungicides.

Pythium Blight

  • Description: Here you can observe chaotically shaded spots of wilted brown grass. This fungus appreciates wet nights and mornings. Streaks a foot wide are formed by patches when they cluster.
  • Prevention: Avoid excessive fertilization or overwatering. Stay away from mowing when plants are wet.
  • Chemical treatment: Fungicides.

Fusarium Blight (Summer Patch)

  • Description: It can be described as light green patches, spreading, turning reddish brown and dying.
  • Prevention: Late spring is that them when you can utilize fungicides. Avoid excessive fertilization and keep to a good watering schedule.
  • Chemical treatment: Fungicides.

Leafspot-Melting Out

  • Description: Here you can observe brown to purple spots on grass blades. It can kill your plants. The disease is provoked by excess nitrogen fertility and probably excess thatch buildup.
  • Prevention: Stay away from introducing extra nitrogen when conducting fertilization. Regularly detach and aerate your garden.
  • Chemical treatment: Nothing is recommended.

Slime mold

  • Description: Just like powdery mildew, the disease covers plants with a powdery covering resembling crystallized frost. Decaying organic matter in the soil – that’s what it feeds on. As the powdery covering gets thicker, it diminishes the light reaching the plant cells. As a result, they become yellow.
  • Prevention: There aren’t any recommendations to prevent it since it’s not dangerous. However, hosing off your grass blades with a forceful stream of water is a simple, but effective measure you can take.
  • Chemical treatment: Nothing is recommended.