How and how to spray tomatoes after rain

Often, gardeners are wondering how to spray tomatoes after rain. Is it necessary to process tomato bushes after rainfall and what is better to use? Let's consider how to carry out such a procedure.

Tomato spraying after rain

Rainwater damage

In rainy and damp weather, fungus develops on tomato bushes. The presence of drip-liquid moisture on the leaves contributes to the spread of late blight spores, which affects tomato bushes. Frequent changes in temperature and increased humidity only provoke the spread of infection.

Tatyana Orlova (candidate of agricultural sciences):

Tomato is highly demanding on soil moisture. With a lack of water, it stops growing, drops buds and ovaries. On the other hand, tomato suffers greatly from high air humidity (optimal 45-50%). At high humidity, the flowers are poorly pollinated and also showered.

Most vulnerable is the young seedlings during the dive period. Plants in the greenhouse are also infected. It is important to process tomatoes in time to prevent infection by the fungus and prevent its reproduction.

How to spray bushes

Milk products

Gardeners recommend using improvised means in the fight against fungal diseases, namely dairy products:

  • Serum. The components of the whey composition feed and strengthen the stalks of tomatoes. Lactic acid stops the spread of fungal spores. For 1 liter of cold water, take 1 liter of serum and spray the bushes every day for 2 weeks.
  • Kefir. A solution (10 l of water, 1 l of yogurt) is sprayed every 7 days before the start of the harvest.
  • Milk with iodine. To combat the fungus, take 10 drops of iodine per half liter of milk, the resulting mixture is sprayed with tomatoes for 3 days. For prevention, it is recommended to treat the mixture every 15 days (1 liter of milk and 15 drops of iodine in 8-9 liters of water).

Potassium permanganate

A mixture of potassium permanganate and garlic has an excellent prophylactic effect. For 2 cups of warm or hot water, you need to take 200 g of chopped garlic, mix thoroughly and leave for 24 hours in a dark place. The prepared mixture is filtered.

The specified proportion is designed for 2 buckets of water. Bushes of tomatoes are sprayed after rain on dry seedlings. After 14 days, the procedure is repeated.

Ash solution

Spraying the bushes with an ash solution contributes to the destruction of the fungus and prevents the occurrence of infection. To prepare an antifungal mixture, 20 g of ash are dissolved in 1 liter of warm water. After 48 hours, the bushes and the soil under them are treated.

The components of the composition of wood ash are used to strengthen the immunity of tomatoes and stimulate their growth. Tomatoes and soil are dusted around with well-sifted ash.

Bordeaux mixture

When spraying, it is important to be careful

Bordeaux mixture is a well-known remedy for the prevention and treatment of fungal diseases. The composition of the drug contains lime, copper sulfate and water. It is quite toxic, and if proportions are not respected, the entire garden can be destroyed.

Tatyana Orlova (candidate of agricultural sciences):

A sign of the excess concentration of the Bordeaux fluid solution above the permissible value during processing is the appearance of a brown mesh and a border on the leaves. In this case, the leaves become stiff and wrap inward.

For tomatoes, it is recommended to use a minimum concentration of 1%, not more. To prepare the mixture, take 50 g of copper sulphate, the same amount of slaked lime in 5 liters of warm water. The mixture must not be cooked in metal utensils. When spraying, it is recommended to use protective gloves and a respirator.


The use of yeast is a very simple and effective method to use: 50 g of yeast is melted in 5 l of water (warm). The resulting mixture is treated with bushes when the first signs of the disease appear.

Yeast is also used as nutritional supplementation. For each liter of water, 10 g of yeast, 50 g of chicken manure, 50 g of ash and 1 tsp are taken. Sahara. The solution is treated with tomatoes once a week.

Boric acid

Boric acid is a drug with an antiseptic effect. They are treated with tomatoes, finely sprayed on the bushes during flowering and fruiting. The acid will be dissolved in hot water: 1 g of the drug per liter.

Boric acid is used not only for the prevention of fungal diseases, but also as a quality fertilizer. In the same proportions fertilize the soil under the bush once every 2 weeks.

Antibacterial drugs

You can also spray tomatoes after prolonged rains with antibacterial drugs that are not harmful to humans and animals:

  • “Gamair” is a biological bactericide, a therapeutic and prophylactic agent against fungal diseases both on plants and in soil.
  • "Gliokladin" is an environmentally friendly preparation for disinfection and restoration of soil microflora.
  • Fitosporin is a microbiological preparation for treating both plants and soil for the prevention of fungal diseases.
  • Alirin-B is a biological agent based on a natural bacterium that inhibits the development of fungal spores and has a good therapeutic effect.


The drug can be applied to wet bushes.

Fungicides are very effective - preparations of a chemical origin (Thanos, Ridomil Gold, Quadris, Strobi) or biological (Fitosporin, Acrobat, Ecosil, Difenoconazole), which help delay development infections.

One of the most effective in the fight against fungus is the Strobi fungicide. A single use of the drug per season is enough. It is important to use it before the appearance of the fruit, as it is toxic. The advantage is the possibility of using it in wet and rainy weather on wet bushes.

The Kvadris fungicide helps to stop the spread of infection, but does not completely kill it. Means "Ridomil Gold" provides protection of tomatoes both inside and outside.


One of the most effective means is Trichopolum - a non-toxic bactericide with an antifungal effect. The proportion of the solution: 1 tablet of the drug is dissolved in 1 liter of water.

In the resulting solution, it is recommended to add liquid soap or a little milk (25 g of the additive for each liter of water). You need to be extremely careful in the use of the drug, since this is one of the antiprotozoal medicines.

Fungal infections are able to adapt to the composition of chemicals, so they are not recommended for a long time to treat them with one remedy.

Blight treatment

Phytophthora (late blight) is a dangerous disease (fungus) that appears after prolonged rains. It is first at first the leaves, and then the whole plant, including the fruits. The first signs of late blight on tomatoes are the appearance and rapid spread of rusty spots on the leaves. In rainy and damp weather, on the infected leaves, a white plaque similar to fluff becomes visible from below.

The fruits are covered with gray spots and deformed, and in the later stages begin to rot. Do not eat infected fruits in any case. Leaves turn black and curl. Fungal disease affects the bushes and spreads very quickly. After infection, the plant dies after 1.5-2 weeks.

After the first signs of infection appear, immediately after rain, infected leaves and fruits are immediately removed from tomato bushes, which are subsequently burned. It is also recommended to harvest the fruits unripe. Before use, tomatoes must be thoroughly washed, and also disinfected in hot water. Thus, you can partially save the crop.

Tatyana Orlova (candidate of agricultural sciences):

To disinfect green tomato fruits taken from a plant infected with late blight, they are dipped in hot water at a temperature of 60-65 degrees for several seconds. Dry the fruits immediately after wiping with a paper towel.

You can save the crop by spraying the bushes with sodium chloride (100 g of powder for every liter of water). The solution is very strong, it is recommended to use it in cases when the plant is affected by more than 50%. The tool will burn not only infected leaves, but also healthy ones, and stop the infection of the fruits.

Fungal Prevention

There are basic rules for the prevention of diseases:

  • avoid the proximity of potatoes (risk of late blight infection);
  • change the landing place every 2-3 seasons;
  • remove the lower leaves that touch the ground;
  • to plant bushes at a distance of 20-30 cm for early varieties and 30-40 cm for late;
  • choose soil with a high nitrogen content;
  • avoid getting liquid on the leaves when watering the bushes;
  • choose early varieties (the fruiting period of which begins before the onset of late blight);
  • treat seeds with fungicides.

Tatyana Orlova (candidate of agricultural sciences):

Tomatoes can not be watered by sprinkling - spray them with a hose. The best methods of watering are by spraying into beds with a steady flow of water and drip irrigation. The so-called "dirty watering", when water with blurry particles of soil falls on the leaves - a direct path to the appearance of fungal infections.


Protect tomatoes after rain from infection and preserve the harvest help timely preventive actions. Timely sprayed bushes are more resistant to attack by fungi. You also need to seriously approach the selection of varieties and soil for planting.

If the disease still partially damaged the plant, use means that can save the crop, if not completely, then at least partially.


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