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This article was co-written by Artemisia Nursery. Artemisia Nursery is a retail plant nursery in Northeast Los Angeles that specializes in growing native plants in California. Artemisia Nursery is a small, employee-owned business, with plans to become a cooperative. In addition to native California plants, Artemisia Nursery offers a selection of succulents, vegetables and herbs, houseplants, pottery, gardening supplies and tools. By focusing on exploiting the knowledge of the founders, Artemisia Nursery also advises, designs and installs for customers.
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Powdery mildew is a powder-like fungus that clings to trees, often shaped like round spots. The disease usually appears on the leaves but can also attack the stems, flowers and fruits of the tree. Leaves infected with powdery mildew may be curled, broken, yellowed, and dry. To treat powdery mildew, you will need a fungicide spray. Fortunately, organic fungicides are also easy to make at home. You will also have to take precautions to prevent the disease from recurring.
Steps
Make a fungicide spray at home
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Try using baking soda, vegetable oil, and dish soap mixed with water. Baking soda is a traditional organic fungicide. To kill fungus on plants, you need more oil and soap to help the blooms cling to the leaves. Mix 1 tablespoon (15 g) of baking soda with 1 tablespoon (15 ml) of vegetable oil and 1 teaspoon (5 ml) of dish soap with 4 liters of water. [1] X Research Source
- Stir the ingredients well and pour the mixture into a clean spray bottle.
- You can also use an oil-based soap, such as Murphy’ oil soap, instead of the soap and strawberry ingredients separately. You only need 2 tablespoons (30 ml) of oil-based soap and 4 tablespoons (60 g) of baking soda mixed with 4 liters of water.
- Try using potassium bicarbonate instead of baking soda. Potassium bicarbonate can be less harsh and still as effective as baking soda when used on plants.
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Make a vinegar solution. Mix 2-3 tablespoons (30 ml – 45 ml) of white vinegar or apple cider vinegar with 4 liters of water. Pour the solution into a clean spray bottle.
- Do not use more vinegar than in the above recipe, as too much vinegar can burn the plant. Remember to test the solution on a small part of the plant before spraying on all of the infected leaves.
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Try a solution of neem oil. The oil of the neem tree is well known for its insecticidal and fungicidal properties. Mix 1 teaspoon (5 ml) of neem oil and 0.5 teaspoon (2.5 ml) of dish soap with 1 quart of water. Pour the solution into a clean spray bottle to use. [2] X Research Source
- Neem oil is available at health food stores, some home stores, and online.
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Try using milk mixed with water. Surprisingly, milk also has antifungal properties and is very effective in treating powdery mildew. Try mixing 350 ml of milk with 850 ml of water and pour it into a clean spray bottle. [3] X Research Sources
- Skim or whole milk can be used, as the ingredient with fungicidal properties is protein, not fat.
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Make a solution of garlic and water. Put 2 peeled garlic bulbs in a blender and add 1 liter of water. Turn blender on high speed for about 5-10 minutes. Strain the mixture through cheesecloth and dilute in batches as much as 1 part garlic solution to 9 parts water in a spray bottle. [4] X Research Sources
- Store the concentrated garlic solution in a labeled refrigerator until needed.
Use the spray correctly
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Test each spray on a small portion of the plant before using. Sometimes fungicides can burn and damage the leaves. Test each medication on a small part of the plant, such as a leaf at the bottom, before spraying the entire plant. Spray enough solution so that it runs down and let dry. [5] X Research Sources
- If the leaves start to turn yellow or brown, the medicine is probably too strong for the plant. Try a different potion on other leaves until you find 2 that work.
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Alternately use the 2 sprays to prevent the fungus from developing resistance. When you find 2 effective drugs, use them alternately so that powdery mildew does not develop resistance to either drug. [6] X Research Sources
- For example, you can use a solution of baking soda for one week and a solution of milk or vinegar for the next week.
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Spray on infected parts of the plant in the morning, no more than 1 time per week. When starting the powdery mildew treatment regimen, you should spray in the morning so that the sunlight dries the solution on the leaves. Usually you will see an improvement after one spray. [7] X Research Sources
- Wait at least 1 week before spraying again, and only do it if you don’t see an improvement in foliage after the first spray.
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Use a clean rag to wipe the leaves to remove some of the powdery mildew. Before spraying the solution on the infected leaves, use a clean, dry rag to remove the powdery mildew from the plant first. This step helps to reduce the amount of powdery mildew that follows the solution to the ground. [8] X Research Sources
- You can also rub the leaves together to remove some powdery mildew.
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Let the medicine run off the leaves. Each time you use a homemade medicine, you should spray on each leaf that is infected with powdery mildew enough for the solution to start flowing off the leaves. Don’t dry the solution – just let it run down and dry on its own. [9] X Research Source
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Use chemical fungicides with caution. Chemical fungicides can work, but they can also cause other problems for your garden. Medicines can harm beneficial microorganisms in the soil as well as bees and pollinating insects that are the creatures that keep the garden healthy. Chemical products also affect the safety of vegetables when eaten, so you must remember to use according to the instructions on the package when used for plants to eat. [10] X Research Source
- Since organic fungicides can be easily prepared at home, you should try them out before resorting to chemical fungicides.
Powdery mildew control and prevention
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Trim off lower leaves that are infected with powdery mildew to reduce spread. If powdery mildew is detected early, you can prevent its spread by removing infected leaves. Do not put these leaves in the compost bin, as powdery mildew can spread through the compost and infect other plants. [11] X Research Source
- Discard infected leaves in the trash to prevent the fungus from spreading.
- Removing infected leaves can also help prevent the disease from spreading to other plants. This is especially important if you grow leafy vegetables.
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Maintain ventilation for the tree. Powdery mildew thrives in humid environments. You should try to plant trees in the garden with wide beds so that the wind can blow through the plants. If possible, you should turn on a fan on the tree on very hot and humid days. [12] X Research Source
- Move potted plants outdoors to a sunny spot in the summer if they are infected with powdery mildew indoors. Fresh air outdoors will help reduce the risk of re-infection.
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Provide enough sunlight for the plant. Too much shade will prevent the leaves from drying out after rain and watering. The right amount of sunlight also makes the plant stronger and less susceptible to disease. You need to grow plants according to the light needs of each plant. [13] X Research Source
- If you live in a rainy or cloudy area, choose plants that do well in such conditions.
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Prune out crowded plants. Trees need air to circulate, so overcrowded plants are susceptible to powdery mildew. Trim excess shoots on plants that block the sun from other plants in the garden and remove weak or wilted leaves every 2 weeks. [14] X Research Source
- If healthy plants appear to be competing for nutrients, replant them in larger pots or beds so they get the air and sunlight they need.
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Avoid watering the plants. Moisture on leaves can create conditions for powdery mildew to multiply. Water the plant close to the base, waiting for the water to seep into the soil before watering more. Do not water plants outdoors on rainy days to avoid over-watering. [15] X Research Source
Advice
- Older foliage is usually affected first and can turn yellow and brittle when infected with powdery mildew.
Things you need
- Aerosol
- Clean rags
- Baking soda or potassium bicarbonate
- Vegetable oil
- Dish soap
- Vinegar
- Neem oil
- Milk
- Garlic
- Water
X
This article was co-written by Artemisia Nursery. Artemisia Nursery is a retail plant nursery in Northeast Los Angeles that specializes in growing native plants in California. Artemisia Nursery is a small, employee-owned business, with plans to become a cooperative. In addition to native California plants, Artemisia Nursery offers a selection of succulents, vegetables and herbs, houseplants, pottery, gardening supplies and tools. By focusing on exploiting the knowledge of the founders, Artemisia Nursery also advises, designs and installs for customers.
There are 9 references cited in this article that you can view at the bottom of the page.
This article has been viewed 1,782 times.
Powdery mildew is a powder-like fungus that clings to trees, often shaped like round spots. The disease usually appears on the leaves but can also attack the stems, flowers and fruits of the tree. Leaves infected with powdery mildew may be curled, broken, yellowed, and dry. To treat powdery mildew, you will need a fungicide spray. Fortunately, organic fungicides are also easy to make at home. You will also have to take precautions to prevent the disease from recurring.
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