Gardening

Tomato mildew: fight effectively


Tomato late blight is one of the most devastating diseases because it can be so rapid and progressive.

As soon as black appears on the leaves, we can already think of tomato downy mildew.

Here is how to avoid mildew and possibly treat against this disease.

Read also :

  • Growing tomatoes well
  • Tomato early blight

Why tomato mildew?

The mildew tomato, its namePhytophthora infestans,is a fungus that causes a devastating fungal disease in tomatoes.

Like all fungi, the favorable conditions for their development are the combination of 2 factors:

  • the heat
  • humidity

Once the tomato plant has been touched, we begin to see the leaves turn black.

If left untreated, all the tomato plants can be affected within days and destroy the crop.

As a preventive measure, tomato mildew

The first thing to do to avoid the appearance of late blight is to have well ventilated tomato plants. By circulating the air as much as possible, you guarantee faster drying of the leaves.

Too tight feet also create containment conducive to the development of tomato downy mildew. Downy mildew spreads on wet leaves, so the longer they stay wet, the more likely you are to be affected by downy mildew.

When watering, never water the foliage but only at the base.

Finally, keep the leaves and tomatoes from touching the ground. Indeed, the soil is a very good vector of diseases and fungi such as mildew. By touching the ground, you promote the appearance of downy mildew.

© MNStudio

Treatment of tomato late blight

There isn't really a cure for tomato late blight, but by observing your plants regularly you should be able to stop the development of late blight.

As soon as black or brown spots appear on the leaves, remove them and destroy them so that there is no trace of the fungus.

Use a clean secateurs, ideally sterilized after each cut, to avoid contaminating the still healthy plants.

Then treat with Bordeaux mixture and repeat the operation regularly until about 15 days before harvesting the tomatoes.

You can also spray on a baking soda solution at a rate of 1 tbsp per liter of water and 1 tbsp of liquid black soap.


  • Read also: how to grow tomatoes well

Video: EZ Baking Soda Fungicide for Tomato Blight Mildew u0026 Mold. MIgardener (October 2020).