How to Prevent Potato Scab

Potato scab is a bacterial disease that affects potatoes and other root vegetables such as beetroot, carrots, radish, parsnip, and turnips. It's caused by the Streptomyces scabies bacterium and prevention is always the best cure. Here are some ways to avoid it in your home vegetable garden.


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    Be aware that the disease can remain in the soil for years. This means that it's important to try your best to avoid planting other root crops before or after a potato crop. However, given the size of gardens, this advice may be impractical.
    • This disease is more of a cosmetic problem than a production one.
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    Take care with watering. This is probably one of the most practical things you can do. Keep the soil reasonably moist but don't over-water.
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    Keep the soil pH at 5.8 or lower. This should only be done if the disease is really difficult to control though, as it'll impact the production ability of both potatoes and any other root crops.
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    Prefer disease-resistant tubers. That way, you're less likely to have a problem.


  • You might want to consider using solarization to treat the soil prior to planting.

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Categories: Growing Vegetables