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9 Natural Ways to Get Rid of Black Rot

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9 Natural Ways to Get Rid of Black Rot

Have you noticed yellow, V-shaped lesions on the leaves of your cruciferous crops recently? Chances are you’ve got black rot, a bacterial disease that affects cruciferous vegetables and other plants.

The good news is that there are several home remedies to treat this problem and restore the health of your garden. So before you head to the garden center, try the simple, organic solutions below.

What is Black Rot?

The term black rot refers to a variety of diseases that affect cultivated plants. It can be caused by bacteria or fungi.

Black rot of crucifers is a bacterial disease that attacks plants in the cabbage family, like broccoli, kale, and, of course, cabbage [1]. It causes dark, dead spots on the leaves and heads of these vegetables.

There is also grape black rot, which is caused by a fungus. It affects the fruits, leaves, stems, and other plant parts [2]. Apple trees and sweet potatoes are other plants the disease might affect.

How to Treat Black Rot Naturally

If you catch it early, you may be able to control black rot using natural methods. Here are some solutions you can try:

1. Pruning

To control black rot, pruning infected plant parts is key. As soon as you spot it on your plant, cut off any infected leaves and fruits.

Use clean, sharp pruning shears and cut off the infected area. For black rot on grapes, don’t be afraid to prune the vines. Grapevines can handle severe pruning.

Remove the pruned parts from the area around your plant to avoid re-infection. Do not compost them.

2. Baking Soda Spray

Organic gardeners often use baking soda as a natural fungicide. As such, it may be a viable home remedy to help treat black rot caused by fungi.

Therefore, use it to make a homemade fungicide for black rot.

For the recipe, mix 2 tablespoons of baking soda with 1 gallon of water. Also, add a teaspoon of liquid soap. Finally, spray the solution directly onto the infected fruits and other areas.

The baking soda will create an inhospitable environment for it to continue spreading. However, you may need to reapply the spray every few days until the infection clears up.

For the best results, spray in the early morning or late evening when the sun is not directly on the leaves.

When used properly and consistently, baking soda sprays work very well at eliminating fungal problems.

3. Clean up the Planting Area

You’ll need to pull up and remove any plants showing signs of black rot.

Also, rake up and dispose of any fallen leaves, mulch, or plant debris around the base of plants. Destroy mummies too.

And don’t forget to sterilize any tools you used on infected plants before using them again. A tidy garden is a healthy garden.

By removing infected plant material and clearing planting areas of debris, you eliminate breeding grounds for black rot and other plant diseases.

4. Keep Plants Dry

Place a fan near your plants to keep the air moving. Stagnant, humid air allows black rot spores to thrive. Improved airflow will make the environment less hospitable for the fungus.

Also, water your plants lightly. Splashing water spreads the disease from plant to plant.

5. Crop Rotation

For vegetable gardens, practice crop rotation by not planting the same crop in the same spot for at least 3 years. This helps break the disease cycle and starve the fungus of its favorite hosts.

Rotate between crop families like leafy greens, root crops, legumes, and fruiting crops. In general, crop rotation helps prevent plant diseases. It also provides a diversity of nutrients.

6. Hydrogen Peroxide

As you may know, this is a natural antifungal and antibacterial agent. It can help control bacteria and fungi that lead to plant diseases [3].

So use it to make a DIY black rot treatment. Mix one part hydrogen peroxide with two parts water. Spray the solution directly onto the infected plants.

This natural remedy has been used by gardeners for years to control fungal diseases and other plant pathogens.

7. Apple Cider Vinegar

Home gardeners also use apple cider vinegar to help prevent fungal plant issues. It is a common home remedy for brown rot, black spot, leaf curl, sooty mold, and fungal black root rot.

To use it, mix one tablespoon of apple cider vinegar with one gallon of water. Spray it on the infected plants.

The vinegar spray is a gentle, organic approach to controlling fungal black rot and other fungal plant diseases.

8. Neem Oil

This is a natural insecticide, fungicide, and miticide derived from the seeds of the neem tree. To get rid of black mold on grapes, you can make a neem oil spray to treat infected plants.

Mix one teaspoon of pure neem oil with a half teaspoon of mild liquid soap. Next, add the mixture to a spray bottle with a quart of water.

Finally, shake well to combine and apply where necessary.

With regular use, it can even help prevent future infections and support the overall health of your garden. However, for severe or persistent cases of black rot, neem oil may need to be used in combination with other organic methods.

9. Arber Bio Fungicide

This is an organic fungicide that uses beneficial bacteria to prevent and control black crown rot, white mold, and other diseases.

Apply Arber Bio Fungicide as a foliar spray, coating the leaves of susceptible plants like grapes, vegetables, and berries. The bacteria will colonize the plant surfaces, creating a protective barrier against fungal disease.


So there you have it: some simple and natural ways to treat and prevent black rot in your garden. Give these methods a try and see what works for you. Gardening is an ongoing learning experience, so don’t get discouraged if it takes some experimenting.

The most important thing is that you take action as soon as you spot those telltale signs of this disease. Best of luck, and happy gardening!

Picture via commons.wikimedia.org

Sasha Brown

Sasha Brown is a blogger and lover of all things natural.

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