Prevent Tomato Blight Naturally with this Spray
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Let's be honest, growing tomatoes is easy until it is not.
One day everything looks great, and the next you are spotting those dreaded brown and black spots creeping across your leaves. Blight is one of the fastest ways to ruin an otherwise solid tomato season.
The good news is that you do not need anything complicated to stay ahead of it.
This simple, preventative spray uses a few everyday ingredients to help protect your plants, and it takes about two minutes to make.
Tomato Blight Spray Recipe
This solution works as both a preventative and a first response if you are starting to see signs.
Ingredients
-¼ teaspoon baking soda (heaped)
-¼ teaspoon vegetable oil
-3 ¾ cups water
-¼ teaspoon dish soap
Equipment
-32 oz. Regular Mouth Mason Jar
Directions
1. Add all ingredients to your Mason jar.
2. Attach the sprayer lid.
3. Shake gently to combine.
4. Spray your tomato plants every 7 to 10 days.
Important:
Do not spray when temperatures are above 90°F, as this can damage the leaves.
What Is Tomato Blight?
Blight is a fungal disease that affects tomatoes and potatoes. You will usually notice:
-Brown or black spots on leaves
-Spots on stems or fruit
-Leaves yellowing and dying off
There are a few common types:
-Early blight causes brown spots on leaves, stems, and fruit
-Late blight is more aggressive and can rot fruit and spread quickly
-Septoria leaf spot causes smaller spots and usually starts on lower leaves
Bottom line, if you see spots, act quickly.
What Actually Causes It?
Blight thrives in moist, stagnant conditions. Wet leaves and poor airflow create problems.
Here is how to stay ahead of it:
-Water at the base of the plant, not the leaves
-Water in the morning so plants can dry during the day
-Space plants 18 to 24 inches apart
-Remove any leaves that show early signs
-Prune lower branches, especially below first flowers
-Remove heavily infected plants entirely
-Use a preventative spray every 7 to 10 days
Why This Works
This is not magic, it is simple chemistry:
-Baking soda helps create a less friendly environment for fungus
-Soap helps the solution stick to leaves
-Oil helps spread coverage evenly
Simple, but effective when used consistently.
