Best Fungicide for St Augustine Grass 2023 [Reviews and Guide]

Looking for the best fungicide for st Augustine grass?

Look no further than our guide! In this article, we will outline the different fungicides that are effective against this type of grass, their benefits and drawbacks, and how to choose the best one for your needs. We hope that this information will help you get the best results from your fungicide treatment and that you will be able to enjoy healthy, lush st Augustine grass!


10 Best Fungicide for St Augustine Grass Reviews of 2023

Dow AgroSciences 173917 Eagle...

Dow AgroSciences 173917 Eagle...

    Scotts DiseaseEx Lawn...

    Scotts DiseaseEx Lawn...

      Spectracide Immunox Fungus...

      Spectracide Immunox Fungus...

        St Augustine grass is a popular lawn grass that can be challenging to take care of. Because this grass grows quickly and is difficult to control, it’s important to use a fungicide that will help keep it healthy and looking great. Here are 10 of the best fungicides for st Augustine grass: 

        1. Dow AgroSciencesEagle 20EW Fungicide

        Dow AgroSciences 173917 Eagle...

        Dow AgroSciences 173917 Eagle...

          The Dow AgroSciences Eagle 20 EW Fungicide is a systemic fungicide that works from the inside out to protect new growth. This fungicide is designed for turf and ornamentals and provides broad-spectrum disease control. The fungicide penetrates into the plant cells, killing fungus on the surface, in the tissue and preventing fungal spores from germinating and spreading.

          It also protects against new infections in turf and ornamentals. It is well tolerated by turf and ornamental grasses. The fungicide is effective in cooler temperatures and will remain effective for 4 weeks after application. The product can be applied in the spring, summer or fall.

          2. Scotts DiseaseEx Lawn Fungicide

          Scotts DiseaseEx Lawn...

          Scotts DiseaseEx Lawn...

            Scotts Disease Ex Lawn Fungicide offers broad-spectrum disease prevention and control against 26 common lawn-blemishing diseases.

            This lawn fungus treatment is preventative when used on lawns to control brown spots and rings before they appear, and curative when applied on lawns showing signs of disease.

            fungus treatment is a fast-acting formula that stops and prevents 26 common lawn-blemishing diseases. This is a systemic fungicide that controls common broad-spectrum diseases for up to 4 weeks.

            3. Spectracide Immunox Fungus Plus

            Spectracide Immunox Fungus...

            Spectracide Immunox Fungus...

              The Spectracide Immunox Fungus Plus is a Rainproof, Pre-emergent, Fungicide for control of diseases caused by fungus. This sprayer is Rainproof in hours.

              You can apply it before the grass starts to green up in the spring, or when the first signs of fungus appear. It will stop the disease in its tracks before it becomes a problem. The Spectracide Immunox Fungus Plus is a quick-flip, self-attaching sprayer for the garden hose.

              Simply flip the switch, and the unit is ready to use. The Spectracide Immunox Fungus Plus is backed by a Money-Back Guarantee.

              4. Scotts GrubEx1 – Grub Killer for Lawns

              Scotts GrubEx1 Season Long...

              Scotts GrubEx1 Season Long...

                Scotts GrubEx1 is a grub killer for lawns that helps prevent grubs for a stronger lawn. It kills grubs when they are young before they cause damage to your lawn.

                It works by emitting an insecticide that is naturally found in freshwater sources. Scotts GrubEx1 is an all-natural, non-toxic, insecticidal product that is safe to use around children, pets, and wildlife.

                It can be used in all climates and on all grasses. It is a product that you can rely on. Scotts GrubEx1 is a grub killer that kills grubs, so you don’t have to spend hours trying to find and kill grubs yourself.

                5. BioAdvanced Fungicide with Disease Prevention Fungus

                BioAdvanced Fungus Control for...

                BioAdvanced Fungus Control for...

                  BioAdvanced Fungicide with Disease Prevention Fungus is an all-natural, systemic fungicide that controls and prevents fungal diseases.

                  It is ideal for the prevention and control of common lawn diseases such as red thread, brown patch, dollar spot, and rust. This systemic fungicide works by penetrating the plant roots, killing the fungus at its source.

                  The systemic fungicide is rain proof and can be applied before, during, or after watering. This fungicide is made from natural ingredients and will not wash off in heavy rains.

                  6. Southern Ag Liquid Copper Fungicide

                  Southern Ag - Liquid Copper...

                  Southern Ag - Liquid Copper...

                    Southern Ag Liquid Copper Fungicide is a liquid fungicide that controls many of the common plant diseases, such as mildew, rust, blackspot, and other diseases caused by fungi. This product is a copper fungicide that is effective against many fungal species.

                    The active ingredient is Copper Ammonium. Copper is a naturally occurring element that is an important component of the human body, and the Copper Ammonium complex is a synergistic combination of copper and nitrogen. Copper is a powerful fungicide and is not toxic to humans or animals.

                    7. Spectracide Immunox Fungus Plus

                    Spectracide Immunox Fungus...

                    Spectracide Immunox Fungus...

                      Spectracide Immunox Fungus Plus is a copper-based fungicide that controls disease causing microorganisms such as algae, moss, mildew, and more. The fungicide has been developed to provide effective control of disease-causing organisms.

                      It is also labeled for control of algae, moss, and mildew. The fungicide provides broad spectrum protection against a wide range of fungi. The product contains a 31.4% Copper Ammonium Complex (8% Metallic Copper Equivalent), which has a synergistic action with the copper compounds.

                      This fungicide is very effective at controlling disease-causing microorganisms, and it is non-irritating to plants. This fungicide may be used in a variety of applications, including residential and commercial lawn care. It can be applied as a foliar spray, as a soil drench, or as a systemic herbicide.

                      8. Grower’s Ally Fungicide for Plants

                      Grower's Ally Fungicide for...

                      Grower's Ally Fungicide for...

                        Grower’s Ally for Plants is a fungicide for plants that kills and prevents powdery mildew. It is a natural fungicide that works as a preventative treatment and kills and prevents fungal infections. The product is FIFRA exempt and OMRI listed for use in organic gardening.

                        It can be used during the vegetative stage of plant growth and during the flowering cycle. It is non-toxic to humans, pets and the environment. The product contains no residual solvents, no synthetic pesticides and no heavy metals. The formulation is also BSCG approved and is recommended by cultivators.

                        9. Bonide Sulfur Plant Fungicide

                        Bonide Sulfur Plant Fungicide,...

                        Bonide Sulfur Plant Fungicide,...

                          The Bonide Sulfur Plant Fungicide is effective against rust, leaf spot, powdery mildew, chiggers, thrips, scale, and listed mites.

                          It is also approved for organic gardening and can be used on apples, beans, cherries, berries, peas, grapes, strawberries, and many more fruits and vegetables in your garden. It can be used to control fleas and ticks on dogs, horses, cattle, swine, sheep, and goats.

                          It can also be used to control depluming mites on chickens, turkeys, ducks, geese, pigeons, and other game birds. The extremely fine particle size contributes to a uniform film-forming layer, better adhesion and more even distribution of particles over fruit and leaf surfaces, resulting in greater efficiency.

                          10. Southern Ag Garden Friendly Biological Fungicide

                          Southern Ag Garden Friendly...

                          Southern Ag Garden Friendly...

                          Southern Ag’s Garden Friendly Biofungicide is a biological fungicide and bactericide for use on plants, fruits and vegetables, shrubs and lawns. It controls fungal and bacterial diseases in the soil, and protects plants against these diseases.

                          The product is designed to protect plants and prolong their growth. The product contains no harmful chemicals. It is safe for humans, animals and the environment.

                          What is St. Augustine Fungus?

                          St. Augustine Fungus is unfortunately common in lawns, especially in the spring season. Some of the top fungi that we see in St. Augustine grass are take-all rot, brown patch, and Grey Leaf Spots.

                          Fungal infections in the lawn can be managed with proper attention to treatments. We’ll take a closer look at each of these fungal diseases.

                          This is a fungal disease that can affect St. Augustine and Bermuda grass. When this fungus attacks bermudagrass, it is usually referred to as bermudagrass decline. Circular patches of brown, dead-looking grass can develop when this fungus affects Bermuda grass.

                          Root rot often appears as large, dark brown, mushy spots. They can appear in all three types of turfgrass, Bermuda, fescue, and ryegrass. Chinch bug damage often appears as light straw-colored patches or as a reddish stain.

                          Calling an expert to diagnose the lawn is best as that expert is sure to know what’s wrong and can provide a solution to your lawn issue.

                          Take-all is a fungal disease that can cause turf and sod to die, and that affects the stolons, nodes, and roots of the turf. There are treatments for it, and if you want to try your own at home, you’ll need a good fungicide to suppress the St.

                          Augustine grass disease or the bermudagrass decline. It’s important to have the correct treatments to stop this issue. It can be tricky to figure out what treatment will work for your lawn.

                          If you have noticed unsightly brown patches on your lawn, it may be a symptom of a disease called brown patch syndrome. If the symptoms are severe and extensive, consult a lawn care professional to see if the cause is chemical.

                          You will notice round, yellow spots in your lawn. These spots are a fungal infection that is spreading quickly. To slow down the fungus and stop its spread, it’s time to apply a good fungicide treatment. Follow the directions on the label of your product.

                          What is the best fungicide for brown patch St Augustine grass?

                          How do you control brown patch St Augustine grass? I recommend using Dow AgroSciences Eagle 20EW liquid concentrate. It blocks the development of fungal cells effectively, stops damage to your lawn, and is easy to use.

                          Does fungicide kill grass?

                          Fungicide is a chemical that is used to kill fungi. It is not typically used to kill grass, but it could potentially kill grass if it is applied in high concentrations. Fungicide can also damage plants if it is not used correctly. It is important to read the label instructions carefully before using fungicide.

                          What are the ingredients of fungicides?

                          The ingredients of fungicides are important to their function. Many fungicides contain copper as the active ingredient, which is a metal that is toxic to fungi.

                          Fungicides also often contain sulfur, which helps to dissolve the copper and make it more effective against fungi.

                          Other ingredients in fungicides may include water, solvents, and other chemicals that help to distribute the copper and sulfur evenly across the treated area.

                          You have to choose a fungicide that is safe for you, the environment, and the grass. Those that contain less harmful ingredients are the best fungicides. Don’t use any pesticides that contain pesticides. For best results, use only natural products, such as those containing Rosemary oil.

                          How do you treat fungus in St. Augustine grass?

                          St. Augustine grass is prone to having several types of fungi that infect the leaves, roots or stems of the grass. The signs of fungal infection in St. Augustine grass will vary depending on which type of fungus is causing the infection.

                          It’s caused by fungus. Signs include wilting leaves and dying, or rotting, roots.

                          Are those straw-colored or brown patches on your St. Augustine grass? Yikes! If you are frustrated by straw-colored or brown patches on your lawn, we feel you. Our lawns should be a place of relaxation and enjoyment, not a host for a lawn fungus!

                          Let’s figure out how you can get a greener lawn and control any lawn fungus you may be dealing with in your St. Augustine grass this year. There’s nothing more irritating than caring for your lawn all winter, prepping your St. Augustine grass for spring, and having it take a big hit with spring rains and storms.

                          You’ve been waiting all year for the spring, the time to enjoy your lush green lawn, only to see fungus in your St. Augustine grass pop up. However, if you’re lucky, you have the opportunity to treat your St. Augustine grass to control those lawn fungus.

                          That is certainly not the lawn you’ve been dreaming of all winter long. Taking-all root rot, grey leaf spot, or brown patch fungus in your St. Augustine grass may be developing in your lawn. But, there are ways to prevent these problems!

                          Do you own your own lawn care business? This spring is the perfect time to avoid or lawn fungus in St. Augustine grass by taking these steps to keep your lawn healthy and beautiful.

                          Types of Fungus in St. Augustine Grass (Identification)

                          Types of Fungus in St. Augustine Grass (Identification) Fungi are one of the most common types of organisms that live all around us. There are fungi that affect us every day, and some of them cause illness, but not all fungi are bad.

                          Most lawn fungal infections eventually manifest as visible patches of brown discoloration in lawns. Here are the different types of fungus that can affect St. Augustine grass:

                          Brown patch disease (Rhizoctonia solani)

                          A fungal disease known as “brown patch” is the most common kind of fungus in warm-season turfgrasses such as St. Augustine grass and Zoysia. The fungus normally attacks the base of the grass blades close to where the plants meet the soil.

                          When the base of the leaves of your basil plants starts turning yellow and has a rotten or decaying smell, you can simply cut those leaves off and they should grow new ones.

                          While there are some lawn care products that are great for preventing the roots of the grasses from getting diseased, there are others that don’t. These products won’t get rid of the problems at the root of the grasses, but they will reduce them.

                          Rhizoctonia causes severe damage to your St. Augustine turfgrass. It’s a fungus that can stay dormant in the lawn thatch for a few months, but it’s a fungus that will cause serious problems if allowed to grow and spread.

                          Dollar spot disease (Sclerotinia homoeocarpa)

                          Dollar spot is a lawn fungal disease that is characterized by random, circular patches that are about 3 inches in diameter.

                          You may notice tan colored spots on the edges of individual grass blades, each surrounded by a light brown or purple ring. The fungi that cause this disease produce a grayish white, fluffy fungal thread.

                          Gray leaf spot (Pyricularia grisea)

                          Infection of turfgrass by gray leaf spot fungi can lead to stunting and yellowing of leaves. These symptoms appear in the early stages of invasion, but eventually the turf will be severely damaged.

                          If your tinea pedis spots get larger, it could be caused by a fungal infection called tinea pedis. You can take steps to prevent this in the future. You should also see a doctor to treat your condition.Culture-independent microbial analysis of wastewater and its potential application for microbial source tracking.

                          In the early stages of turf decline, affected areas may appear healthy looking but eventually, the grass blades will start to thin and brown, with little or no growth. This is similar to the look that would occur if a lawn was experiencing drought stress.

                          Fairy rings (Basidiomycetes)

                          The fairy ring is a disease that causes turfgrass damage. It’s caused by fungi (basidiomycetes) and releases a toxin to harm turfgrass.Q:

                          It’s characterized by zones of dead, brown grass surrounded by dark-green zones, and mushroom mycelia growing in rings around these dead spots. You may also spot this fungus on lawns that are in close proximity to golf courses.

                          Pythium blight (Pythium spp)

                          Pythium blight caused by Pythium fungi is known to cause Pythium blight, or grease spot disease. The spores of this fungus are usually transported across the lawn as runoff water drains through the soil.

                          Augustine lawn. During the early stages of this fungal disease, sections of your St. Augustine turf will assume a gray tan and a wilted appearance. As the fungi advance, you’ll begin noticing brown and matted spots on your turf, which may be surrounded by bronze-colored grass blades on the edges.

                          Take-all root rot disease (Gaeumannomyces graminis)

                          Take all root rot disease (Gaeumannomyces graminis). Early symptoms of take-all root rot disease (Gaeumannomyces graminis) include sections of your lawn turning light green-yellowish instead of the dark green color that you’ve come to associate with healthy turf.

                          Eventually, after enough time, the stolons and roots of the affected areas will die, and you’ll notice black-colored spots and root rot. The decay of the roots causes the affected grass plants to die, leaving behind bare spots on the lawn.

                          This soil-inhabiting fungus likes to inhabit dead stolon tissue, particularly that which is between the topsoil and the base of the grass blades.

                          To determine what is causing the brown patch, do an inspection. If you’re not sure whether it’s a disease, a grub, or something else, the best thing to do is to look into it further.

                          Which Diseases the Fungicide Prevents?

                          Fungicides are used to prevent the spread of fungal diseases in crops. The most common use of fungicides is to protect plants from the early stages of infection before the symptoms are visible.

                          Fungicides can be used on a variety of crops, including fruits, vegetables, and nuts. Maintenance of lawn mower is important. The chemicals we use in the mower are not harmful to humans or pets.

                          All diseases affect the lawn in different ways. Some Zoysia grasses can be affected by brown patches.

                          The brown patches in the grass are more common than other diseases. Good-quality fungicides can help your lawn fight off brown patches and other pests.

                          You should always check before buying as you don’t want to end up with a garden full of lawn pests. It’s a good idea to check the label of the fungicide to see if it can cure the disease or not.

                          St. Augustine Grass Fungus Treatment Procedure

                          To make sure that you are making the right decisions about the kind of care your lawn requires and how to best help it, we are going to look at a few of the things that you can do to ensure that your lawn is healthy, is growing well, and will have a long-lasting, healthy lawn.

                          If you want to treat your lawn infected with a St. Augustine fungus, here are some of our pro tips you might want to keep in mind when trying out treatments for St. Augustine grass fungus! Smart Watering. This one is tricky to master but so effective when trying to avoid fungus in your lawn!

                          Top tips for watering your grass are to make sure your lawn is well-maintained and isn’t full of weeds. You want your grass to be healthy and to last for a long time.

                          When watering your lawn, you will want to be very precise and strategic with your plan. If you’re not careful, you could end up pooling in your yard, which invites the growth of lawn fungi.

                          Rain gauges help you monitor the amount of rain that is falling in your area. You’ll learn how to measure how much rainwater there is in your area, and what you can do if the amount of rain you’re receiving is less than what is necessary.

                          It’s important to make sure that your lawn gets enough water every week to keep it healthy and support growth during the growing season, which is about 1 to 1.5 inches a week.

                          In case you need an alternative to a rain gauge for measuring precipitation, an empty can is just the thing for the job!

                          Apply a lawn fungicide.

                          Apply a lawn fungicide The most effective way to get rid of the fungus in St. Augustine grass is applying a lawn fungicide such as Scotts DiseaseEx or Cosan

                          .Apply the treatment at the onset of the disease to treat and prevent brown patches in your lawn.

                          Repeat treatments will be necessary if the disease is advanced. There are many different types of fungi that can cause brown patch disease. Some fungicides may be more effective against some types of the disease than others.

                          Examples of effective fungicides for St. Augustine grass lawns include Azoxystrobin, Pyraclostrobin, and Fluoxastrobin. You can use these products in combination, though, because the different types of fungus respond differently to each product.

                          It’s a good idea to alternate the products you use for different areas of your skin, so you don’t get one of them dry out while the other is still wet.

                          Improve soil drainage in your lawn

                          If you have a wet spot in your lawn then you need to drain the water from around the base of the plants. You can do this by digging out a small area of grass, cutting it close to the roots and lifting up the clod so it is removed from the soil.

                          Fungus can be prevented by core-aerateing and dethatching your lawn. You can also prevent standing water in your lawn by removing rocks and sticks that may prevent or slow water from draining into the soil.

                          Replace the affected sod

                          Replace the affected sod with new St. Augustine grass sod. This is the best way to get rid of fairy ring fungus. It’s more environmentally friendly than chemical fungicides.

                          Dig up the grass sod in those sections where the pest has gotten into the roots and replace it with a new St. Augustine grass sod. If you can’t find a new sod, you can also opt for fungicides like Consan 20 or flutolanil.

                          Fungicides are typically made from two or more active ingredients, so when it comes to maximizing their effectiveness, you’ll want to combine products with different active ingredients.

                          Slightly lower the soil pH

                          Slightly lower the soil pH Some types of fungi such as take-all root rot fungi thrive in highly alkaline soil conditions. You can treat and prevent this fungal disease in St. Augustine grass by gradually lowering your soil pH to be slightly acidic.

                          Applying ammonium sulfate to your lawn every year will help your lawn to fight against take-all root rot fungus. To get better control of the fungus, you can mix ammonium sulfate with peat moss.

                          Take all root rot is a gradual and more of a preventative measure. You can get rid of it faster by using appropriate fungicides, including myclobutanil and propiconazole.

                          St. Augustine lawns do best when you apply these fungicides during spring and fall. Be sure to water your lawn after the application of these fungicides to ensure the active ingredient penetrates into the root zone and the soil to kill the fungus.

                          Avoid overwatering your lawn

                          Water your lawn thoroughly every week. St. Augustine requires about 0.5 inches of water per week to grow. If you over water your lawn it encourages fungal activity that can lead to root rot, so avoid overwatering.

                          If your lawn has brown patches, and you suspect your turf grass has brown patch disease, make sure to check the amount of water you’re providing. Water your lawn twice a week, once with about ½-inch of water.

                          Place a measuring cup on top of a regular one so that the full water line is marked. After you’ve watered your yard for a day or two, turn off the sprinkler and measure how much water is left in the cup to prevent overwatering.

                          Reduce shade in your lawn

                          Lawns shaded by trees, buildings, or other vegetation should not be left untreated if they are a green color.

                          You want to cut your St. Augustine grass canopy so that it receives at least 7 hours of direct sunlight to prevent lawn fungus.

                          Water your lawn at sunrise

                          5.9 A.M. If the morning dew is present, water before this time. In fact, the first morning dew can contain many organisms that can cause diseases.

                          In the morning your lawn should be watered when the sun has just risen. This way the grass will be dry and there won’t be fungal spores for it to get.

                          Want to know about St. Augustine Grass Diseases?

                          Lawn Fungus: St. Augustine is now the third most popular lawngrass for homeowners to plant in North America after Bermudagrass and Kentucky Bluegrass.

                          Fungus doesn’t have to wait for the warmer months to be a problem. At the first sign of fungus, you should call an expert for professional treatment programs that will get rid of the fungus and prevent it from returning.

                          This information will help you care for your lawn better. Remember, you’re looking for patches of grass that have a yellow or brown color, straw colored spots, and thin turf.

                          If you notice signs of fungus or other issues in your St. Augustine, check your sprinkler system to see if it’s overwatering your lawn or if your water is pooling in certain areas.

                          It’s always nice to have a beautiful, lush green lawn and enjoy playing on it, so when you call us for a free lawn care estimate, you should know that your well-being is important to us.


                          There is still much to learn about the best fungicide for st Augustine grass. However, by reading this blog you’ve learned a few key points that can help you get started. By experimenting with different fungicides and keeping a close eye on the health of your st Augustine grass, you’ll be on your way to achieving optimal growth!

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