Best Fungicide For Powdery Mildew of 2024: Top 6 Picks

By Harry RamosLast update: 2024-07-11

Are you tired of seeing your plants and crops plagued with powdery mildew? Look no further! This article will equip you with the information needed to pick the best fungicide for powdery mildew.

We have researched and tested the best products that are proven to get rid of powdery mildew once and for all. Say goodbye to unsightly white patches on your leaves and hello to healthy, thriving plants.

Here are the best fungicides for powdery mildew you can buy in 2024:

  • Best For Lawn: Scotts 032247376105
  • Best For Fast Results: Spectracide 100507462
  • Best For Roses: Bonide 811
  • Best For Fruit Trees: Earth's Ally Disease Control Fungicide Treatment
  • Miticide, Fungicide, & Insecticide Combo: AgroMagen GrowSafe
  • Fungicide & Bactericide: Monterey LG3374
6 Best Fungicides For Powdery Mildew
Best For Lawn
Scotts 032247376105
    Best For Fast Results
    Spectracide 100507462
      Best For Roses
      Bonide 811
        Best For Fruit Trees
        Earth's Ally Disease Control Fungicide Treatment
          Miticide, Fungicide, & Insecticide Combo
          AgroMagen GrowSafe
            Fungicide & Bactericide
            Monterey LG3374

              Best For Lawn: Scotts 032247376105

              Scotts 032247376105
              Scotts 032247376105
              Pros
              • Suitable for lawns – Azoxystrobin 00.31%
              • Reliable - Registered safe for lawns by EPA
              • Ideal for large areas – the coverage of up to 5000 square feet
              Cons
              • Not safe for pets and wildlife

              Registered safe for lawns by EPA, the Scotts 032247376105 is an effective fast-acting treatment for a wide range of lawn problems, including powdery mildew.

              This product contains Azoxystrobin, a fungicide that has been deemed safe for use on turfgrass in residential areas. Studies have shown Azoxystrobin is effective at controlling powdery mildew on ornamental plants, with a reduction of up to 95% in infection rates.

              Plus, a big advantage of Azoxystrobin is it’s not adversely affected by extreme heat or sunlight, meaning it can be used in areas where temperatures may reach as high as 95°F.

              Per 7-pound bag, the Scotts 032247376105 covers an area of up to 5000 square feet.

              Scotts 032247376105 Specifications

              Volume

              7 Pounds

              Active Ingredients

              Azoxystrobin - 00.31%

              Highlight Features

              Azoxystrobin 00.31%

              Registered safe for lawns by EPA

              the coverage of up to 5000 square feet

              Verdict

              The Scotts 032247376105 is specifically formulated for lawns, and can effectively cure a wide range of lawn problems, including powdery mildew.

              Best For Fast Results: Spectracide 100507462

              Spectracide 100507462
              Spectracide 100507462
              Pros
              • Fast-acting & Provide 2-week fungal protection – Myclobutanil
              • Rain-proof (once dried completely)
              • Safe to use around pets and people
              Cons
              • Limited coverage

              With the active ingredient being Myclobutanil, the Spectracide 100507462 is a fast-acting fungicide that delivers results within days of application. And it provides protection against major lawn diseases, including powdery mildew, for up to two weeks.

              It also works well on other plant pests, such as aphids and lace bugs.

              The Spectracide 100507462 is designed to be used as a preventive measure, but it also works on existing fungal infections.

              This product is easy to mix and use, and can't be washed off by rain once it has dried. In addition, it's safe to use around pets and people if used according to directions.

              Spectracide 100507462 Specifications

              Volume

              16 Fluid Ounces

              Active Ingredients

              Myclobutanil

              Highlight Features

              Myclobutanil

              Verdict

              The Spectracide 100507462 delivers fast results within days of application, plus it’s safe to use around pets or humans.

              Best For Roses: Bonide 811

              Bonide 811
              Bonide 811
              Pros
              • Safe for roses - patented copper formulation
              • Leave no residue on plants
              • Easy to store - convenient size
              Cons
              • The included measuring cup is inconsistent
              • The fungicide has an unpleasant odor

              The Bonide 811 contains Copper Octanoate, which is EPA-approved for organic gardening and can be used to treat common fungal diseases, such as powdery mildew.

              It works by coating the surface of plants and interfering with the production of fungal spores, thereby preventing the growth and spread of disease.

              Two other advantages of the copper formulation are 1) it works quickly and 2) it provides long-lasting protection against fungal diseases.

              Thanks to its convenient size, this fungicide is easy to store. We also like this product because it doesn't leave any residue on plants.

              Bonide 811 Specifications

              Volume

              16 Fluid Ounces

              Active Ingredients

              Copper Octanoate (copper Soap) 10%.

              Highlight Features

              patented copper formulation

              Verdict

              Whether it’s a rose garden or organic garden, the Bonide 811 is a reliable and effective fungicide that can kill and control powdery mildew without harming the plants.

              Best For Fruit Trees: Earth's Ally Disease Control Fungicide Treatment

              Earth's Ally Disease Control Fungicide Treatment
              Earth's Ally Disease Control Fungicide Treatment
              Pros
              • Suitable for fruit trees and organic gardens - OMRI-listed formula
              • Safe for people, pets, and the planet - Triazole fungicides and Citric acid
              • Leave no harmful residue on plants
              Cons
              • It must be applied in temperatures below 90 degrees

              The Earth's Ally Disease Control Fungicide Treatment is a great choice for fruit trees because its formula is OMRI-listed for use in organic gardening and is environmentally safe.

              You can use the product directly in fruit trees, and it is safe up to the day of harvest.

              This fungicide contains a combination of Triazole fungicides and Citric acid that work together to effectively control many types of fungi, therein, powdery mildew. Meanwhile, they leave no toxic residue on your plants.

              The concentrate is easy to apply using the included mixing instructions.

              Earth's Ally Disease Control Fungicide Treatment Specifications

              Volume

              32 Ounces

              Active Ingredients

              Citric Acid.

              Highlight Features

              OMRI-listed formula

              Triazole fungicides and Citric acid

              Verdict

              The Earth's Ally Disease Control Fungicide Treatment is safe to use in fruit trees for powdery mildew control.

              Miticide, Fungicide, & Insecticide Combo: AgroMagen GrowSafe

              AgroMagen GrowSafe
              AgroMagen GrowSafe
              Pros
              • Eco-friendly - Made from a proprietary blend of 100% food-grade ingredients
              • Multifunctional – a fungicide, miticide, and insecticide combo
              • Affordable price
              Cons
              • The product does have a strong odor (that can linger for a few days after application)

              Made from a proprietary blend of 100% food-grade ingredients, the AgroMagen GrowSafe is an all-natural formulation that contains no synthetic chemicals or toxins.

              It is safe to use on fruits, vegetables, flowers and herbs.

              But the best part is, this product is a 3-in-1 product that acts as a fungicide, miticide, and insecticide.

              So, not only to control powdery mildew, the AgroMagen GrowSafe is effective against spider mites (two-spotted mites, broad mites, russet mites), whiteflies, aphids, and downy mildew.

              AgroMagen GrowSafe Specifications

              Volume

              33.8 Fluid Ounces

              Active Ingredients

              Citric acid

              Highlight Features

              Made from a proprietary blend of 100% food-grade ingredients

              a fungicide, miticide, and insecticide combo

              Verdict

              The AgroMagen GrowSafe is the most versatile and convenient option. It’s built to function as a fungicide, miticide, and insecticide—all in one product.

              Fungicide & Bactericide: Monterey LG3374

              Monterey LG3374
              Monterey LG3374
              Pros
              • A great bacteria and fungi control solution - Bacillus amyloliquefaciens strain D747
              • Easy to apply – two application ways: sprinkler or hose-end sprayer
              • It has a pleasant smell
              Cons
              • A bit expensive compared to other options

              The Monterey LG3374 is an effective preventative biofungicide/bactericide. It uses the naturally occurring beneficial bacterium Bacillus Amyloliquefaciens strain D747 to help protect plants from a variety of diseases, therein, powdery mildew.

              Its active ingredient also helps to reduce the damage caused by these diseases in plants, resulting in better overall health and production. You can use it on both lawns and gardens.

              The Monterey LG3374 is easy to use and can be applied in one of two ways: sprinkler or hose-end sprayer. Plus, it brings quick and effective results.

              Monterey LG3374 Specifications

              Volume

              16 Fluid Ounces

              Active Ingredients

              Bacillus amyloliquefaciens strain D747

              Highlight Features

              Bacillus amyloliquefaciens strain D747

              two application ways: sprinkler or hose-end sprayer

              Verdict

              We recommend the Monterey LG3374 for those seeking a truly effective biofungicide & bactericide product for powdery mildew.

              How To Choose The Best Fungicide For Powdery Mildew?

              Types Of Fungicides

              There are six different types of fungicides that can be used for powdery mildew control.

              These include sulfur, copper-based products, chlorothalonil, horticultural oil, potassium bicarbonate, and Bacillus subtilis. All of these fungicides work in different ways to help control powdery mildew and can provide effective protection for vegetable crops.

              Sulfur

              Sulfur is an effective fungicide for controlling powdery mildew and has been used since ancient times.

              It works by creating a sulfur deposition on the surface of leaves, which prevents the fungus from establishing itself and can also create an inhospitable environment for the spores.

              Copper-based products

              Copper-based products are also very effective against powdery mildew and work by preventing the fungus from attaching to the plant surface.

              Chlorothalonil

              Chlorothalonil is another popular fungicide that works by creating a thick coating on the leaves, which prevents the spores from landing and growing.

              Horticultural oil

              Horticultural oil is formulated to smother fungal spores and prevent them from developing on the plant surface.

              Potassium bicarbonate

              Potassium bicarbonate is a natural fungicide that disrupts fungal cells and prevents them from growing.

              Bacillus subtilis

              Finally, Bacillus subtilis is a type of bacteria that produces antifungal compounds that can control powdery mildew.

              These six fungicides can be used on their own or in combination with other products to help manage powdery mildew on vegetable crops.

              However, it is important to remember that proper timing, application rates, and environmental conditions must all be taken into consideration when using any type of fungicide to ensure the best results.

              Make Sure The Fungicide Is For Your Plants

              Read the label information for the fungicide to make sure it is labeled for the specific plant you are treating and states it will be effective against powdery mildew.

              Consider Environmental Factors

              Why? Because the development of powdery mildew is influenced by temperature, relative humidity, light, and air circulation.

              Generally, the optimal conditions for powdery mildew growth occur in mid to late summer so this is the time period you need to be especially mindful of its development.

              Which Brands Make The Best Fungicide For Powdery Mildew?

              Scotts

              Many gardeners and lawn owners love choosing fungicides from Scotts for many good reasons.

              First of all, all its products are made with high-quality ingredients and tested for efficacy and safety before being released on the market. Furthermore, Scotts works closely with government regulatory agencies such as EPA to ensure its products meet the highest safety standards.

              The brand also offers a range of products to suit different lawn needs and has a team of experts who can provide helpful advice on the best product for your needs.

              Earth's Ally

              Earth's Ally has developed a natural, effective, and safe product that meets organic gardening standards. The active ingredient in their product is citric acid, which is a natural, organic compound with no harsh chemicals or residues.

              Additionally, Earth's Ally is guaranteed to be safe for people, pets, and planets with no harm to any living creatures.

              Monterey

              With a comprehensive selection of products, Monterey is a favorite brand of many shoppers when it comes to finding products to protect your lawn, garden, and plants.

              FAQs

              Is there a systemic fungicide for powdery mildew?

              Yes, there are many systemic fungicides for powdery mildew, such as myclobutanil, propiconazole, and thiophanate-methyl. These fungicides have the advantage of being sprayed less often than other fungicides

              Can fungicides for powdery mildew be sprayed in hot weather?

              Yes, fungicides for powdery mildew can be sprayed in hot weather. In fact, hot weather conditions help the product to dry on the leaves more quickly.

              Do fungicides for powdery mildew work instantly?

              Fungicides for powdery mildew do not work instantly. Most fungicides need to be applied multiple times over a period of several weeks in order to be effective. Some may take up to two or three weeks before they start to show results.

              Can fungicides get rid of powdery mildew permanently?

              Yes, they can. Fungicides - such as potassium bicarbonate, neem oil, sulfur, and copper-based products - can help permanently get rid of powdery mildew.

              When should I spray to prevent powdery mildew?

              To prevent powdery mildew on plants, you should spray infected plant areas in the morning. This will allow the sun to dry the treatment on the leaves and may improve the condition after just one treatment.

              Conclusion

              Overall, we can see that the best fungicides for powdery mildew are those with active ingredients such as propiconazole or myclobutanil. Other formulations may be available, but it is important to read product labels carefully and follow directions precisely to ensure proper application and effectiveness.

              When in doubt, it is always better to contact your local extension agency for advice on a fungicide that will work best for your specific crops and growing conditions.

              That’s all for this article. Thanks for reading!


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