Skip to content

Milk Spray Recipe for Powdery Mildew (Natural Fungicide for Plants)

Have you ever had a powdery mildew outbreak on your houseplants? The leaves look “foggy” and have a white-ish coating on them.

Powdery mildew is a common fungus that feeds off the sap of your plants. This fungal disease can be devastating to crops, as it robs plants of their nutrients and water, which can kill them. 

I know all too well the frustration of losing plants to mildew. I have a lot of plants and always do my best to keep them healthy, but sometimes they get sick and die anyway.

This is why I was so excited to learn that the milk spray recipe for powdery mildew works so well! It’s a simple way to protect your plants from infection and ensure they stay healthy for longer.

But let’s first examine what this powdery mildew is and how dangerous it is for your plants.

What is powdery mildew, and how to identify it?

Powdery mildew is a fungus that grows on the leaves of many plants.  The powdery white or gray mold that forms on the leaves is actually millions of microscopic spores. It can affect all kinds of plants, including vegetable gardens, houseplants, and flowers. 

Milk spray recipe for powdery mildew

How Does it Grow and Spread?

Powdery mildew thrives in warm, dry conditions. It can attack almost any plant, but in my case, berries, grapes, and cucumbers were the most infected ones. The fungus grows best when temperatures are between 68 and 86 degrees Fahrenheit (15-27 degrees Celsius). It is the high humidity and temperature in the area where I live that is the primary cause of powdery mildew on my plants.

Symptoms Of Powdery Mildew

Powdery mildew is a fungus that attacks many different plants, including some of my favorites.

The symptoms can vary from plant to plant and even from one area of the plant to another. Here are some of the most common places you might see powdery mildew:

Milk spray recipe for powdery mildew
  • Leaves: You may see white or gray patches on the leaves and stems of your plants. The patches will be covered in what looks like a powder, which is actually millions of spores.
  • Flowers: Powdery mildew on flowers can cause them to wither and die or be misshapen and discolored.
  • Fruit: If your fruit has powdery mildew, it could become shriveled or discolored.
  • Stems: Powdery mildew can grow on both stems and roots and cause them to become discolored and weak over time.

Types Of Powdery Mildew

There are several types of powdery mildew, and they all work in slightly different ways. Here are all the most common types, along with how to treat them:

Erysiphe graminis

This one is the most common type of powdery mildew on plants, but it’s also one of the easiest to treat. Just spray your plant with neem oil or milk (or both), and it should go away pretty quickly. Read here for a complete guide regarding erysiphe graminis

Erysiphe graminis

Podosphaera fuliginea

This type can also be treated with milk, but it can also be treated by just cutting off infected leaves and throwing them away.

Podosphaera fuliginea

Sphaceloma beticola

This type tends to infect plants that are already stressed out, so if you notice it early enough, you can avoid damaging your plant by treating it with baking soda, vinegar, and milk before too much damage has been done.

Sphaceloma beticola

Identification & Appearance of Powdery Mildew On Plants

You can identify powdery mildew by:

  • Feel the white growth with your fingers. Powdery mildew feels like salt or talcum powder but is softer.
  • Looking at the leaves and stems under a magnifying glass or microscope. Powdery mildew looks like a layer of white dust on the undersides of leaves and around flowers.
  • Touching the top of infected plants with a piece of paper; if it turns dark brown, then you have powdery mildew!
Identification & appearance of powdery mildew on plants

Treatment of Powdery Mildew

The best way to treat powdery mildew is to prevent it from occurring in the first place by planting resistant varieties of plants and keeping them healthy by providing proper care and water. If powdery mildew has already appeared on your plants, there are several ways to treat it, but the most popular and most effective approach is using a milk spray.

The golden Milk spray Recipe for powdery mildew

Powdery mildew is a fungus that infects plants and causes powdery, white spots to form on them. It can be devastating to gardens, but there’s a simple solution: milk spray for powdery mildew.

Milk spray has been used for years as a natural pesticide and fungicide. It’s biodegradable and non-toxic so it won’t harm your plants or the environment. Plus, it’s incredibly easy to make!

Here’s how:

  • Grab a gallon of milk from your fridge (either whole or 2%) and pour a little into a bucket or any other container. 
  • Combine 1 part milk with 2 to 3 parts water.
  • Pour the mixture into your spray bottle, close tightly, shake vigorously to make a well-combined mixture before each use, and spray onto affected areas!
The golden milk spray recipe for powdery mildew

When to Use Milk Spray to Control Powdery Mildew?

The best time to spray milk for powdery mildew control is when the plant is actively growing, usually from spring to early fall.

The more you water your plants, the more likely they are to get mildew on them, so if you live somewhere with a lot of rain or humidity (like where I am), then you may need to give your plants extra care during that period.

When you’re ready to start spraying, ensure that your plants have been adequately watered. 

How does Milk Spray work as Mildew Killer?

I wanted to make sure that my plants were healthy and thriving, but the mildew kept coming back. I tried everything, and nothing worked. That’s when I read about how milk spray works as a mildew killer!

A mildew spray works by breaking down the cell walls of the mildew, which then causes the cells to collapse.

The milk helps prevent mold growth and wash away any dirt or grime that may be on a surface. 

When you spray milk onto plants, it forms a thin film over the leaves of your plant. This film protects your plant from sun damage and helps keep moisture in so your plant doesn’t get too dry or too hot. 

It also helps keep bugs away, which is super helpful for things like tomatoes!

How does milk spray work as mildew killer?

How To Prevent Powdery Mildew From Keep Coming Back?

To prevent powdery mildew from coming back, first, take a hard look at the conditions powdery mildew needs to grow.

  • High humidity
  • High light
  • High nitrogen environments. 

Powdery mildew is a fungal disease that can infect many plants, including roses, gardenias, cucumbers, squash, and tomatoes. The fungus grows on the surface of leaves and stems and can cause yellow spots to appear on the leaves. Left untreated, powdery mildew can spread rapidly throughout a garden.

To prevent powdery mildew from returning to your outdoor garden or lawn:

  • Remove leaves and weeds from your garden beds so they don’t harbor spores from previous seasons. Also, remove any dead or dying plant material from around your plants to eliminate possible sources of infection for new growth.
  • Water in the early morning or evening to avoid water loss through evaporation.
  • Another way to prevent mildews is to grow resistant varieties of plants such as roses, daisies, chrysanthemums, or strawberries. 
How to prevent powdery mildew from keep coming back?

You should also avoid overwatering your plants since waterlogged soil is an ideal place for fungi to grow. If you know how to use a moisture meter you will also be able to determine when and how much water your plants need. For more information, check out my blog to purchase a suitable soil moisture meter for you.

If you have an infected plant, remove it immediately before spreading it to other healthy plants nearby!


If you are looking for a naturally occurring fungicide to help eradicate or prevent powdery mildew on your plants, I would highly recommend using this milk spray recipe as a first defense. 

Thanks to its high lactic acid content, milk is a useful option to help control powdery mildew. It’s an effective natural fungicide that can keep your plants flourishing all season long. We hope you’ll find this article helpful in dealing with powdery mildew, and we very much look forward to your comments and feedback below.

Ian richardson

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.