Hydrangeas are praised for the beauty of their bigger blooms and attractive green foliage. But fungal diseases such as Cercospora leaf spot, anthracnose, powdery mildew, botrytis blight, and rust can ruin the beauty of your hydrangeas.
Don’t worry! You don’t need any magical weapon to get rid of them. You only need the best fungicide for hydrangeas to control and prevent the fungus.
Now the question; what is the best fungicide for hydrangeas?
The organic or synthetic type of fungicide that contains some kids, pets, and environment-friendly fungus killing organic and chemical ingredients like copper substances, neem extract, tebuconazole, Bacillus subtilis, myclobutanil, and so on.
For your convenience, here I have listed and reviewed the best fungicide for hydrangeas that can help you to get rid of fungal diseases.
In A Hurry? Here is the overall best fungicide for hydrangeas that you can pick right now-
Best Fungicide for Hydrangeas-Comparisons
|Garden Safe Brand Fungicide||Neem Oil||Organic|
|Spectracide Immunox Fungicide||Myclobutanil||Synthetic|
|Southern Ag - Copper Fungicide||Copper Complex||Organic|
|Bonide 811 Copper 4E Fungicide||Copper Octanoate||Organic|
|Serenade Garden Fungicide||Bacillus subtilis||Organic|
|Bayer Advanced 701250 Fungicide||Tebuconazole||Synthetic|
|Dr. Earth 8007 RTU Fungicide||Rosemary Oil|
Best Fungicide for Hydrangeas-Reviews
1. Garden Safe Brand Fungicide-Ready To Use
As an active ingredient, it contains 0.9% hydrophobic extract of neem oil and you will be happy to know, neem oil contains Azadirachtin. Azadirachtin has a triple-action formula that can kill insects and mites as well as the fungus on the hydrangeas.
That means it also acts as pesticides and as a pesticide, it can kill aphids, scales, caterpillars, beetles, whiteflies, mealybugs, and some other garden pest.
And as the fungicide, it can control and prevent leaf spots, powdery mildew, rust, anthracnose, blight, and other fungal diseases of hydrangeas.
It is a Ready to Use fungicide that comes with the hand trigger. Just shake and spray on the upper and lower surface of leaves of hydrangeas. Spray once per 2 weeks to prevent the fungal disease.
It also comes in concentrate and Ready to Spray formula that has 70% neem oil. So you need to dilute the solution before spraying on hydrangeas if you pick the concentrate and RTS form of this fungicide.
2. Spectracide 100507462 Immunox Multi-Purpose Fungicide
Spectracide 100507462 Immunox is the best fungicide for treating Cercospora disease, powdery mildew, and other fungal diseases on hydrangeas. It is the synthetic fungicide that is safe for your hydrangeas and your health.
As an active ingredient, it contains 1.55% Myclobutanil. It is a triazole chemical that acts as the inhibitor of the ergosterol synthesis and protects the fungal diseases of hydrangeas by killing the fungus.
The best part of this fungicide, it can dry quickly and doesn’t wash off if it dries once. So, you can protect your hydrangeas without doing any harm to the environment.
It is available in concentrate formula. You need to dilute the solution before spray. To spray this best fungicide on the hydrangeas-
Mix 2 tablespoons concentrate into a gallon of water, spray the solution until the leaves become wet completely to control and prevent the fungal diseases of hydrangeas.
3.Southern Ag – Liquid Copper Fungicide
Are you looking for the best copper fungicide for hydrangeas? Here is the Southern Ag-Liquid Copper Fungicide for you. Copper is approved for organic gardening. That’s why you may also call it the organic fungicide. But the manufacturer didn’t clarify its organicness.
Let’s analyze this copper-based fungicide-
It contains 31.4% Copper Ammonium Complex as the active ingredient to control and prevent leaf spots, powdery mildew, rust, anthracnose, and some other fungal diseases of hydrangeas.
Want to know the mode of action of copper on hydrangeas?
When you spray the copper fungicide on hydrangeas, the suspension of copper will be dry quickly and gradually release copper ions when the leaves and stems become wet. If the fungus attacks the hydrangeas plant surface, the copper ion protects the fungus to develop.
To prevent and control the fungal diseases-
Mix 4-6 tablespoons (2-3 oz.) of concentrate fungicide per gallon of water. Spray the diluted solution on the foliage of hydrangeas.
4. Bonide 811 Copper 4E Fungicide
Bonide 811 Copper 4E Fungicide is the best organic fungicide that is certified by OMRI. It is also a copper-based fungicide and you know copper can kill the fungus to control and prevent fungal disease.
As the active ingredient, It contains 10% copper octanoate or copper soap to control and prevent most of the fungal diseases of hydrangeas including rust, Cercospora leaf spots, blight, gray mold, and powdery mildew.
It is available in concentrate formula. So, you need to dilute this solution before spraying on the hydrangeas.
To control leaf spot of hydrangeas, mix 3 tablespoons (15 ml) of concentrate fungicide per gallon of water and spray the pre-mixed solution on foliage hydrangeas and to control powdery mildew on hydrangeas, mix 2 tablespoons (10 ml) concentrate fungicide per gallon of water.
Both solutions can control and prevent some other fungal diseases of hydrangeas.
5. Serenade Garden AGRSER32 Fungicide
It contains 1.34% Bacillus subtilis bacteria as the active ingredient. Bacillus subtilis is a beneficial bacteria that has fungicidal properties. That’s why it is used in bio fungicide to control leaf spot, leaf blight, gray mold, powdery mildew, and the rust of the hydrangeas.
The best part of this bio fungicide is-
The Bacillus subtilis can stay and live on the root system of your hydrangeas after spraying this fungicide once. They form spores, multiply, and provide protection against fungus. Also, it provides some essential plant food and antibiotics to the hydrangeas.
It comes in concentrate formula. Mix 4 tablespoons in a gallon of water and spray on the foliage of hydrangeas to control and prevent fungal disease.
6. Bayer Advanced 701250 Fungicide Concentrate for Rose
It contains 2.90% tebuconazole as an active ingredient. Tebuconazole is a triazole fungicide that is marked safe by FDA.
The best part of this fungicide is-
It can provide 3-way protection to hydrangeas. It kills the existing fungus and prevents them from developing, and forms a protective barrier on the foliar surface of the plants. Most importantly, it acts as a systemic fungicide that means the plant can absorb this fungicide and provide protection up to 2 weeks from the fungus.
Another benefit of this fungicide is, it can wash out if the plant absorbs once that makes this fungicide environment-friendly.
It also comes in concentrate form. Mix 1 tablespoon of concentration into a gallon of water and spray once per 14 days interval during the growing season to prevent the fungal diseases of hydrangeas.
7. Dr. Earth 8007 RTU Disease Control Fungicide
It contains rosemary oil, peppermint oil, cloves, clove oil, and malic acid as the active ingredients of this fungicide. All are the kitchen ingredients and have fungicidal properties. Also, it contains 13 other inert ingredients that make it super-efficient.
The bottom line; the natural blend of these ingredients can control and prevent leaf spots, powdery mildew, rust, leaf curl, leaf blotch, scab, dollar spot, brown rot, and other diseases.
Also, it provides different multi-minerals to help the plant to heal disease-damaged foliage and keep the insect away from the hydrangea plants.
It is available in Ready to Use formula with rosemary smell. Shake well, press on the trigger, and spray on the vegetative parts of the hydrangeas.
How often Apply Fungicide on Hydrangeas?
Prevention is the best way to get rid of fungal disease. Because most of the fungicides work well in the early stage. If the fungal diseases develop on hydrangeas, the fungicide can’t kill them successfully. That’s why you need spray fungicide as a preventive spray.
According to the experts, you need to apply fungicide once per 14-15 days in the growing season and apply once per 5-7 days during the rainy season to prevent the fungal disease of hydrangeas and to control, spray fungicide when you notice any sign of the infections.
When is The Best Time to Spray Fungicide on Hydrangeas?
Fungicide can be the cause of phytotoxicity if you spray it in hot and sunny weather. That’s why you need to know the best time to spray fungicide on hydrangeas to avoid phytotoxicity.
Early morning or early evening is the best time to apply fungicide on hydrangeas. Because, morning and evening weather remains cool, windless. But if you spray fungicide on the hydrangeas in the early evening, consider that the fungicide gets enough time for drying before night.
How to Apply Fungicide on Hydrangeas?
Applying fungicide is the easy task if you follow a few steps and here are the simple steps for your help-
- Measure the fungicide and prepare a dilute solution according to the label directions. Ignore this step if you pick Ready to Use fungicide for hydrangeas.
- Pour the solution into a hand sprayer.
- Spray clean water on the foliage of the hydrangeas.
- Now shake the pre-mixed or Ready to Use solution and spray on the foliage until the leaves and stems wet completely.
Homemade Fungicide for Hydrangeas
Recipe1: Baking Soda Fungicide
- Baking Soda
- Liquid Soap
- Mix 5 grams of baking soda into 1-liter of water.
- Add 1 teaspoon of liquid soap.
- Pour the solution into a sprayer and spray on the hydrangeas.
Recipe 2: Castile soap as Fungicide
- Castile Soap
- Vegetable oil/Neem oil
- Mix Pour 5 tablespoons of Castile soap into 1 gallon of water.
- Add a teaspoon of vegetable oil/neem oil.
- Shake and spray on the hydrangeas.
Recipe 3: Milk or Milk Powder as Fungicide
- Milk or Milk Powder
- Mix ½ liter milk per gallon of water.
- Pour into the sprayer and spray on the hydrangeas.
Fungal diseases are spread easily. So, if you notice any sign of inspections, remove the infected parts carefully and spray fungicide on the foliage of the affected plants.
And never water your plant at night. Excess moisture can develop fungus on the leaves of hydrangeas. Spraying fungicide once per 14-15 days is the best way to get rid of fungal diseases and I hope you found the best fungicide for hydrangeas.