How To Make Homemade Powdery Mildew Spray In 2023

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Powdery mildew is a common fungal disease that affects many plants, including vegetables, fruits, and flowers. It appears as a white or gray powdery coating on the leaves, stems, and fruits of infected plants. If left untreated, powdery mildew can weaken and eventually kill the affected plants. Fortunately, you can make your own homemade powdery mildew spray using simple ingredients that are readily available. In this article, we will provide you with a step-by-step guide on how to make an effective powdery mildew spray at home.


Q1: What are the ingredients needed to make homemade powdery mildew spray?

A1: To make homemade powdery mildew spray, you will need the following ingredients:

– 1 tablespoon of baking soda

– 1 tablespoon of vegetable oil

– 1 teaspoon of liquid soap

– 1 gallon of water

Q2: Why are these ingredients effective against powdery mildew?

A2: Baking soda helps to kill and prevent the spread of powdery mildew by altering the pH on the leaf surface, making it less favorable for the fungus to grow. Vegetable oil acts as a suffocating agent, smothering the powdery mildew spores. Liquid soap helps the mixture stick to the plant leaves, increasing its effectiveness.

Q3: How do I make the homemade powdery mildew spray?

A3: Follow these steps to make your own powdery mildew spray:

Step 1:

In a large container, mix 1 tablespoon of baking soda with 1 gallon of water. Stir well until the baking soda dissolves completely.

Step 2:

Add 1 tablespoon of vegetable oil to the mixture. Stir thoroughly to ensure the oil is evenly distributed.

Step 3:

Add 1 teaspoon of liquid soap to the mixture. Stir gently to avoid creating excessive suds.

Step 4:

Your homemade powdery mildew spray is now ready to use. Transfer it to a spray bottle for easy application.

Q4: How do I apply the homemade powdery mildew spray?

A4: Follow these guidelines for applying the homemade powdery mildew spray:

– Spray the mixture directly onto the affected plant leaves, making sure to cover both the upper and lower surfaces.

– Apply the spray in the early morning or late afternoon when the temperature is cooler to avoid leaf burn.

– Reapply the spray every 7-10 days or after rain to ensure continuous protection.

Q5: Are there any precautions to take when using the homemade powdery mildew spray?

A5: Yes, it is important to take the following precautions:

– Test the spray on a small area of the plant first to check for any adverse reactions.

– Avoid spraying the mixture on flowers or buds, as it may cause damage.

– Keep children and pets away from the sprayed plants until the mixture has dried.


Making your own homemade powdery mildew spray is an effective and eco-friendly way to combat this fungal disease. By using simple ingredients like baking soda, vegetable oil, and liquid soap, you can create a powerful spray that will help protect your plants from powdery mildew. Remember to follow the application guidelines and take necessary precautions to ensure the safety of your plants. With regular use, your homemade spray will keep your plants healthy and powdery mildew-free throughout the year.

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