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Preparing Your Soil to Avoid Tomato Blight

Category Plant Health
Late season tomato blight is caused by a fungus that is highly contagious and can spread by wind born spores. This is a page about treating the soil to prevent tomato blight.


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March 21, 2007

If you have a problem with tomato plants contracting a blight that starts at the bottom and works its way up until the plant is dead, or even the beginning of a blight, you need to cook your garden bed. Once tomatoes are infected, they cannot be helped. The key is solarizing the soil to kill the bacteria before they get to the plants. As soon as you can work the soil, turn the entire bed to a depth of 6 inches, then level and smooth it out. Dig a narrow 4 to 6-inch deep trench around the whole bed and thoroughly soak the soil by slowly running a sprinkler over it for several hours.

Cover the bed with a clear, heavy plastic painters drop cloth. Lay the edges of it in the trench and cover with soil to keep heat from escaping. The sun should heat the area for at least 6 weeks. The longer you leave the cover in place, the better. In the meantime, try growing some of those new verticillium and fusarium-resistant varieties in another location, or in containers of sterile potting soil, as you let your infected tomato bed cook.


This gardening information comes from Veggie Grow How, by Glen O. Seibert, "The Greenman".

By Connie from Oden, AR

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What can you put in the planting holes for tomatoes to prevent blight?

Hardiness Zone: 7a

By Kyra Leigh from Bristol, TN


July 15, 20100 found this helpful
Best Answer

At the end of the growing season, after I have removed the plants from the garden, I scatter a bale of straw on top of the garden and set it on fire. It sterilizes the soil so this year's diseases won't affect next year's plants.

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July 19, 20100 found this helpful
Best Answer

When you plant, they need some blood meal. Then as the season goes on and blossoms show up, quickly get the espom salts into the soil.


Buy the package and read the directions on it for tomatoes. The soil needs magnesium sulfate (ES) to make good blossoms. Not just tomatoes, all things that blossoms are better with ES.

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