Diseases and viruses that affect our tomato crop

Previously we were looking at the different pests that can affect our tomato crop. Among the pests we saw the white fly, the aphids, the red spider, etc. Now I come to comment on the diseases and viruses that can attack our crops and with this I close this chapter on diseases of tomatoes.

Do you want to know more about the diseases and viruses that can affect your tomato crops?


  • 1 Diseases that affect tomato cultivation
    • 1.1 Oidiopsis
    • 1.2 Mildew
    • 1.3 Rust
    • 1.4 rot
    • 1.5 scum
  • 2 Viruses that can affect tomatoes

Diseases that affect the cultivation of tomatoes


tomato powdery mildew

It is a fungus that is generated in good conditions of humidity and temperature. Most mushrooms need plenty of moisture and a comfortable temperature to grow well. To be able to recognize it, we have to pay attention to the fact that it has a whitish color and usually appears on the upper part of the leaf. As they grow and time progresses it causes the leaf to turn yellow until it finally rots.

In order to combat it in an ecological way, we can use wettable or powdered sulfur. Also if you have an urban garden and you can put the plants in the sun, the fungus dies.


mildew on tomato

It is a fungus also affects the leaves of the plant. It can be recognized because light or dark green spots begin to be seen, becoming necrotic over time. On the underside appears a fine white veil that corresponds to the spores. On the stem, we find elongated brown spots that are a symbol of necrosis and wilting in the plant. The crop takes on a burnt appearance. In the developing fruits, soft brownish spots are observed, generally in the upper half.

To palliate and treat it, copper sulfate is used.


It is another fungus. This has orange coloration on the underside of the leaf and yellowish on the upper side. It can be treated with a horsetail decoction and can also be treated like the other two mushrooms with copper sulfate.


tomato rot

It is the best known and is produced by a fungus that causes injuries to the plant. The fungus called botrytis turns the affected area brown, while the other produces a white, cottony area. It can be combated with potassium soap, garlic extract and copper sulfate. Although it is more useful to prevent as this way we can avoid damage to the plant. We must avoid cuts in the plant that could infect it, not having the plants very close and eliminate any area that could infect the rest.


This is a fungus that produces a black spot on both the leaves and the stem and the tomato. It can be controlled with horsetail slurry, sage, nettle and tansy. Copper sulfate can also be applied.

As we can see, most fungi can be combated with copper sulfate.

Viruses that can affect tomatoes

tomato slice

To finish and close this chapter of affections to our tomato crops, we mention those viruses that can attack them. In this case, we cannot fight it, only prevent them. There are multiple viruses that attack tomatoes but we cannot fight them, only prevent them.

If general symptoms such as dwarfism and yellow color are observed in almost the entire tomato plant, it is advisable to cover it with a bag, pull it out and eliminate it to prevent it from spreading to the rest of the plants. There is also a rot which is a calcium deficiency disease in the plant. This can be seen when the fruit appears black below.

We can also find the cracked tomatoes. This occurs when temperatures drop rapidly or there is an imbalance in irrigation. To avoid this, we must take care of sudden changes in temperature and maintain good conditioning for the crops, since once the tomatoes are cracked, there is little we can do to solve them.

Well, with these tips and information we have already closed the chapter on pests and diseases that attack tomato cultivation, I hope they have been useful

Diseases and viruses that affect our tomato crop

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