How to Treat Late Blight in Plants


You determine that late blight caused your tomato plants to rot, so now you need an effective treatment plan to salvage your crop. Late blight is a disease that affects tomato, potato and eggplant crops and will decrease yield and will affect the fruits and potatoes. Here's how to treat late blight in those plants so you can enjoy the fruits of your labor this harvest.

  • Spray potato and tomato plants with a fungicide, such as chlorothalonil or mancozeb, which you can purchase online from places such as Horticulture Specialties. Do this every 10 to 14 days to keep late blight at bay.

  • Apply the fungicide for the first time to potatoes before they flower. Apply it to tomatoes soon after the first fruits set.

  • Remove any rotting due to late blight as soon as it occurs. Destroy it so it does not spread the disease around to other plants.

  • Destroy any affected potatoes, and remove any affected tomato and eggplant fruits. Dig up the potatoes and separate them from your other garden plants to avoid contamination.

  • Compost only the healthy plant scraps. Putting potatoes or fruits infected with late blight on the compost heap will only serve to spread the disease.

Tips & Warnings

  • Be vigilant during the wet season, which is when the conditions for spread of late blight are most favorable.
  • Thunderstorms can carry the spores that cause late blight for miles.
  • Always properly dispose of fruits and potatoes to decrease the possibility of contaminating the rest of your garden.

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