If you’ve ever grown squash, you’ve probably had powdery mildew. It’s a pesky white fungus that can take over your plants if you’re not careful. But don’t worry! There’s an easy and natural way to treat it using something you probably already have in your kitchen: baking soda. Let’s dive into how you can treat powdery mildew on squash plants using baking soda and keep your squash plants healthy and mildew-free.

Table of Contents
1.) What Is Powdery Mildew? (Click here)
2.) Why Baking Soda? (Click here)
3.) How to Make a Baking Soda Spray (Click here)
4.) Tips for Preventing Powdery Mildew (click here)
5.) You Can Find All the Equipment I Used (Click here)
What Is Powdery Mildew?
Powdery mildew is a common fungal disease that looks like a white, powdery coating on the leaves of your squash plants. It thrives in warm, dry conditions and can spread quickly if not treated. While it doesn’t usually kill the plant, it can weaken it, reduce your harvest, and make the leaves look pretty rough.
Why Baking Soda to Treat Powdery Mildew on Squash Plants?
Baking soda is a fantastic natural remedy for powdery mildew. It works by changing the pH on the surface of the leaves, making it less hospitable for the fungus to grow. Plus, it’s safe for your plants, the environment, and you! Using a baking soda spray to treat powdery mildew on squash plants is also safe for pollinating insects like bees and butterflies. The spray targets the mildew without harming these beneficial insects, allowing them to continue their important work in your garden. Just be sure to apply the spray early in the morning or late in the afternoon when pollinators are less active, so you don’t accidentally disturb them. This way, you can keep your squash plants healthy while protecting the pollinators that help your garden thrive.

How to Make a Baking Soda Spray
Making a baking soda spray is quick and easy. Here’s what you’ll need:
- 1 tablespoon of baking soda
- 1 teaspoon of mild liquid soap (like dish soap)
- 1 gallon of water
Instructions:
- Mix the Ingredients: Start by mixing the baking soda and liquid soap in a small amount of water to dissolve them. Then, pour the mixture into a gallon of water and stir well.
- Pour into a Spray Bottle: Once everything is mixed, pour the solution into a spray bottle. This will make it easy to apply directly to the affected leaves.
- Spray Your Plants: Spray the solution generously onto the leaves of your squash plants, making sure to cover both the tops and undersides of the leaves. It’s best to do this early in the morning or late in the afternoon to avoid the hottest part of the day, which can cause the leaves to burn.
- Repeat as Needed: You’ll want to reapply the spray every 7 to 10 days until the powdery mildew is gone. If you notice rain washing away the spray, just reapply it afterward.
Tips for Preventing Powdery Mildew on Squash Plants
While treating powdery mildew is important, preventing it is even better! Here are a few tips to help keep your squash plants healthy:
- Space Out Your Plants: Give your plants plenty of space to allow for good air circulation. This helps prevent the mildew from spreading.
- Water at the Base: Water your plants at the soil level rather than from above. This keeps the leaves dry, which makes it harder for mildew to grow.
- Remove Infected Leaves: If you spot leaves that are heavily infected, remove them to stop the spread of mildew to other parts of the plant.

Final Thoughts on Treating Powdery Mildew on Squash Plants
Powdery mildew can be a hassle, but with a simple baking soda spray, you can treat it naturally and effectively. Plus, by taking a few preventative steps, you can keep your squash plants healthy and productive all season long. So grab that baking soda from your pantry and give your plants the care they need to thrive! If you have any question, please leave a comment and I’ll get back to you! I would also love to hear what tips and tricks you use to keep your garden healthy!😊
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This post contains affiliate links, which means I make a small commission at no extra cost to you. See my full disclose here.
Glass Spray Bottles, 16oz Refillable Containers, https://amzn.to/3MeDaCl
ARM & HAMMER Baking Soda Made in USA https://amzn.to/3YPkyAt
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