Andre CampbellIt may start as a few grayish-white powdery spots or patches on your plant’s leaves. Left unchecked, powdery mildew spores can spread to other plants [1].
As it spreads, the infection will weaken the plant. The leaves may also curl up, twist, or dry out.
Powdery mildew can affect fruit trees, vegetables, and many flowering plants.
What Causes Powdery Mildew?
Powdery mildew spreads through tiny spores carried by the wind. It grows best during warm days, cool nights, and in places with poor air circulation [2].
Crowded plants are more likely to develop the disease.
How to Get Rid of Powdery Mildew Naturally
Below are home remedies and natural solutions that you can try in your garden.
1. Vinegar
Organic gardeners often use a vinegar-water mixture as an antifungal treatment for plants.
Vinegar’s acetic acid makes it effective at controlling powdery mildew. However, because vinegar can burn plant leaves, use only a weak mixture and avoid spraying in hot sunlight.
Apple cider vinegar is the preferred choice. To use it for powdery mildew, mix three tablespoons of vinegar with a gallon of water.
Always test the spray on a small area of the plant first. Some plants may be sensitive to vinegar sprays.
Use it to spray the plants every three days.
2. Neem Oil
Neem oil is a natural fungicide and insect control product that many gardeners use. Therefore, you can use it to make a homemade fungicide for powdery mildew.
To use neem oil against powdery mildew, combine 1 to 2 tablespoons of neem oil with 1 teaspoon of liquid soap and 1 gallon of water. Next, add the mixture to a spray container and spray both the tops and undersides of the leaves.
Alternatively, you can purchase a ready-to-use neem oil concentrate. To avoid leaf burn, use the solution early in the morning or late in the evening.
3. Baking Soda
You can also make a DIY powdery mildew spray using baking soda. Combine 1 tablespoon of baking soda, 1/2 teaspoon of liquid soap, and 1 gallon of water.
Shake well and spray the plant’s leaves. Use this solution as a preventive measure.
Baking soda works best before powdery mildew becomes severe. It may slow the spread of the disease, but it usually will not cure badly infected plants.
Reapply after a shower of rain.
4. Improve Air Circulation
To reduce the spread of the disease, give your plants more room to breathe.
Pruning and thinning plants can help prevent overcrowding. This method also improves air circulation.
5. Avoid Overhead Watering
Water plants near the base instead of spraying the leaves. Good airflow and lower humidity can help slow the spread of powdery mildew.
6. Potassium Bicarbonate
Potassium bicarbonate is one of the most effective organic remedies for powdery mildew. It damages powdery mildew spores and helps stop the disease from spreading.
To use it, mix 1 tablespoon of potassium bicarbonate with 1 gallon of water. Add 1 teaspoon of mild liquid soap to help the spray stick to the leaves.
Spray both the tops and undersides of the leaves thoroughly. Reapply every 7 to 14 days or after heavy rain.
Always test the spray on a small section of the plant first to check for sensitivity. Avoid spraying during the hottest part of the day to reduce the risk of leaf burn.
7. Cueva
Cueva is a brand of liquid copper fungicide. Copper fungicides help prevent fungal spores from developing and spreading.
This product helps control powdery mildew, bacterial cankers, anthracnose, brown rot, and more. Moreover, it is OMRI-listed for safe use on organic crops.
8. Bonide Liquid Copper Fungicide
This product is another copper-based powdery mildew fungicide. It is also effective in treating plant rust and downy mildew.
Moreover, the product is safe to use in your organic garden. This ready-to-use spray can be used on ornamental, vegetable, and fruit crops.
Always follow the label directions because too much copper can build up in the soil over time.
9. Banish
Banish is a popular, powerful, all-natural, organic fungicide.
The product stops mildew by disrupting spore germination and mycelial growth. This process damages the fungal cells.
However, always follow the label instructions carefully when using this product.
10. Milk
Milk spray is a preventive measure for controlling powdery mildew on specific plants.
To get rid of powdery mildew with milk, make a solution using 40% milk and 60% water. Skim milk is often preferred.
Remove all affected leaves before applying the spray.
Afterward, use it as a foliar spray for your plants. Repeat after 10 to 14 days and after a heavy rain shower.
Research suggests that milk sprays may help protect plants such as pumpkins, cucumbers, grapes, and apples, although results can vary [3].
11. Garlic
Garlic is another popular natural remedy for powdery mildew. It contains natural sulfur compounds that may help slow fungal growth.
Just blend 2 garlic bulbs with 2 cups of water. Next, strain the mixture and add one teaspoon of liquid soap.
Afterward, dilute a quarter cup of the garlic mixture in a gallon of water. Finally, use it as a foliar spray, but test it on a few leaves before treating the entire plant.
A much easier option is to purchase a garlic-based product that helps fight fungal diseases in plants.
12. Compost Tea
Some gardeners use compost tea for powdery mildew, but research has shown mixed results.
To make compost tea for your plants, add a shovelful of finished compost to a 5-gallon bucket of water.
Leave it to steep for a week, then use the solution to water the plants. However, dilute it with water (1:1) before using it.
This home remedy may help support plant health and disease resistance.
13. Pruning
Cutting back parts of a plant to let in more air can also help control mildew.
Therefore, prune small trees and shrubs. Remove dead or unwanted plant parts to improve air circulation.
Also, remove diseased plant parts. Doing so will help maintain disease-free plants.
14. MilStop SP Foliar Fungicide
MilStop is a popular fungicide used to control powdery mildew and other fungal diseases. This potassium bicarbonate-based fungicide kills mildew spores on contact.
It provides an organic solution that is both curative and preventive.
How to Prevent Powdery Mildew
- Space plants properly.
- Plant in sunny locations when possible.
- Water early in the day.
- Avoid excess nitrogen fertilizer.
- Remove infected plant debris.
- Remove badly infected leaves.
- Prune crowded plants to improve airflow.
Takeaway
Powdery mildew is common, but you can often control it with early treatment and good plant care. Catching it early gives your plants the best chance to stay healthy.
Check your plants often so you can spot powdery mildew early. Early treatment is usually much more effective than waiting until the disease has spread.
Sasha Campbell
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