Sasha CampbellIt’s frustrating to see your plants with black spots on their leaves, often with yellowing around these spots. Black spot is a common fungal disease affecting many plants, especially roses.
If left untreated, it can weaken plants and diminish their beauty.
Fortunately, there are natural ways to manage and prevent this disease. Below, we’ll explore natural remedies and preventive measures to fight black spot disease.
Identification
Before tackling black spot disease, it is essential to identify it correctly.
Black spot disease is caused by the fungus Diplocarpon rosae. It appears as small, round, black, or dark brown spots on the upper surfaces of leaves [1]. These spots often have fringed edges and may be surrounded by yellowing areas.
Over time, infected leaves may turn yellow and drop prematurely.
Black spot disease primarily affects roses. It can also affect some ornamental plants, like hydrangeas and hollyhocks.
Some fruit trees and vegetables may also occasionally develop similar fungal infections.
How to Get Rid of Black Spots on Plants Naturally
Below, we’ll explore natural remedies and preventive measures that can help combat black spots. These home remedies and natural solutions are safe, effective, and environmentally friendly.
1. Neem Oil
Neem oil is a powerful natural fungicide that effectively controls black spot fungus. This oil contains compounds that can disrupt fungal growth.
To use neem oil, dilute it with water as the label says. Then, spray it onto the affected plants. Ensure thorough coverage of the leaves and other affected plant parts.
2. Horticultural Oil
Horticultural oil is another natural option for managing black round dots on plants. This oil works by smothering fungal spores and preventing them from spreading.
Mix the oil with water as directed. This treatment is particularly effective when used early in the infection cycle.
3. Cow’s Milk and Water
One surprising home remedy for black spot disease is a simple mixture of cow’s milk and water. Milk contains natural enzymes and proteins that inhibit fungal growth [2, 3].
To make a DIY milk-based foliar spray, mix one part milk with two parts water. Spray it on the affected leaves. Repeat the application every 10 to 14 days, especially during high humidity.
4. Keep the Foliage as Dry as Possible
Most fungal plant problems thrive in damp conditions. So, keep your plant’s foliage dry. Doing so can significantly lower the risk of black spot and other fungal problems.
5. Water Plants Carefully
Overhead watering from a hose or sprinkler can worsen the black spot. It splashes fungal spores onto healthy leaves.
Instead, drip irrigation or a soaker hose delivers water directly to the soil.
6. Reduce Humidity
Good air circulation is also vital for preventing black spot disease. Crowded plants create a humid environment in which fungi can flourish.
To improve air circulation, space your plants when planting. Also, prune them regularly to remove excess growth.
7. Hydrogen Peroxide
Hydrogen peroxide can also help combat black spot on roses and other plants.
Mix one tablespoon of 3% hydrogen peroxide with one cup of water to make a homemade black spot spray. Next, spray the solution onto the infected leaves.
Reapply every three to five days until the symptoms are under control.
8. Baking Soda Spray
Baking soda is a household staple that doubles as an effective anti-fungal treatment.
To use baking soda for black spot, dissolve a tablespoon in a gallon of water. Then, add a few drops of dish soap.
Shake well and spray this mixture onto the affected plants, ensuring complete coverage. Also, apply it in the early morning or late evening to avoid the day’s heat.
In addition, you will have to reapply after a shower of rain.
9. Apple Cider Vinegar (ACV)
ACV is another home remedy for controlling black spot.
Mix one tablespoon of apple cider vinegar with one quart of water and spray it on the infected plants.
The acidity in apple cider vinegar helps to kill fungal spores while promoting healthier foliage [4].
10. Remove and Discard Infected Leaves and Plant Parts
One of the best ways to control black spots is to remove and discard infected leaves and plant parts.
Use clean, sharp pruning shears to cut away diseased foliage. Next, dispose of it in the trash rather than composting it.
Do not compost infected plant material. It can allow the fungus to survive and reinfect your garden.
11. Practice Crop Rotation
If this plant disease is a recurring issue, avoid planting susceptible species in the same spot each year. Rotating your crops can help break the cycle of the disease.
12. Arber Bio Fungicide
Arber Bio Fungicide is an organic product. It fights rose black spot, botrytis neck rot, bean rust, and other plant issues.
It will not cure this plant disease but prevent the fungal pathogen from taking hold.
You can use it as a foliar spray or soil drench. Follow the instructions that come with your order for the best results.
It can also be used on vegetable crops, flowers, indoor plants, trees, and shrubs.
13. BONIDE Liquid Copper Fungicide
Copper-based fungicides, like BONIDE Liquid Copper Fungicide, are a good natural cure for black spot disease.
Apply this fungicide carefully, following the label directions.
Takeaway
Dealing with black spots on your plants doesn’t have to involve harsh chemicals. You can manage this fungal disease with natural remedies. Try neem oil, milk sprays, or baking soda solutions.
Also, preventive measures are vital for plant health. Keep foliage dry, avoid overhead watering, and improve air circulation.
These natural solutions can protect your plants from black spot and other fungal infections.
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