From milk to vinegar: how to spray tomatoes to expel phytophthora

 From milk to vinegar: how to spray tomatoes to expel phytophthora

Tomato bushes, which are sick with late blight, quickly wither, fruits and foliage are covered with brown spots, rot. To combat this disease, there are many expensive chemical drugs, but traditional methods are much safer and no less effective.


This penny remedy, found in every home medicine cabinet, has powerful antiseptic properties. Despite the vitality of phytophthora, brilliant green is capable of destroying it. For the treatment of bushes, a solution of 3 ml of brilliant green and 10 liters of water is prepared. At the first signs of the disease, the bushes are sprayed once a week until they are completely cured.

In addition to fighting late blight, brilliant green improves the vitality of tomatoes and acts as a top dressing, saturating the plant and the soil around it with potassium, fluoride and copper.

The brilliant green solution does not have a coloring effect on bushes and fruits.

Hydrogen peroxide

Peroxide is effective against most fungi and bacteria, therefore it is also suitable for the treatment of phytophthora. To do this, 3% hydrogen peroxide is diluted at the rate of 2 tbsp. l. preparation for 1 liter of water, and then the stems and leaves of tomatoes are sprayed with a solution. The frequency of processing is 7-10 days.

Numerous reviews of experienced gardeners only confirm the effectiveness of peroxide against tomato infection.

Peroxide disinfects damage on the bushes, leaves begin to receive more oxygen, become resistant to many diseases, in addition to phytophthora.

Calcium nitrate

When it gets on the leaves, calcium from nitrate is quickly and completely absorbed by them, enhancing the immunity of the bushes. This allows them to effectively resist the disease. To prepare a suitable solution, 1 tbsp. calcium nitrate is diluted in 1 liter of water, mixed thoroughly until the crystals dissolve. Then add water so that the total volume of the solution is 10 liters.

Tomatoes are fed under a bush at the rate of 1 liter for each plant and the green part is sprayed.

The solution must be kneaded in a glass container, since the oxidation process will take place in a metal one. Spraying should be done with a freshly prepared solution in the evening and in dry weather.

Boric acid

Boric acid is a cheap but very effective drug for late blight. Boric acid powder is suitable for processing tomatoes, which is diluted at the rate of 10 g of the product per 10 liters of water. But due to poor solubility, the powder is first stirred in a small volume of hot water, and then added to 10 liters and mixed again.The finished solution is sprayed on the bushes with an interval of 10-14 days. And so that the drops of the product that have fallen down do not burn the roots, it is better to water the soil with plain water first.


Ash infusion is suitable for both treatment and prevention of late blight, as it is harmless to plants. To prepare the solution, take 250-300 g of ash and dilute it in 10 liters of warm water, insist for three days. Then add 50 g of crushed laundry soap for good fixing of the solution on the tomato bushes and stir until completely dissolved.

Filter the resulting mixture and start spraying.

For medicinal purposes, apply the infusion before the destruction of phytophthora, and with prophylactic three times per season - after planting seedlings in the ground, before flowering and after the formation of ovaries. And in order to destroy phytophthora spores in the soil, it is enough to scatter ash around the bushes and in the aisle.


Lactic acid bacteria are also harmful to phytophthora. They are found both in milk and in kefir or whey. A product based on these products is absolutely safe and additionally serves as a fertilizer for weakened plants. To obtain a solution for the treatment of tomatoes, 1 liter of milk or any of the listed products is diluted in 9 liters of water and the plants are abundantly sprayed.

Tomatoes are processed almost daily until complete recovery from late blight.

For the manufacture of the product, it is better to use homemade products, and not store products, because the latter are processed and pasteurized.

Baking soda

Soda can be found in every kitchen, and it is not expensive at all. This penny product is able not only to destroy phytophthora, but also to add sugar content to future fruits. To prepare a medicinal solution, 3 tbsp. soda is dissolved in 10 liters of water. Tomatoes are processed under conditionally unfavorable weather conditions, that is, immediately after rain or on a hot day with an interval of a week.

Table vinegar

A visible effect in the fight against late blight can be achieved with the help of 9% table vinegar. Its antimicrobial properties are well known in folk medicine.

For processing, make a solution of 100 ml of vinegar and a bucket of water.

Plants are periodically sprayed with a fresh solution, and the progression of the disease stops after the first application.


Garlic contains phytoncides, essential oils, and sulfur compounds that have antibacterial and antifungal properties.

Thanks to this composition, it can also be used to combat late blight.

To prepare a remedy, 200 g of peeled garlic cloves are passed through a press, the gruel is transferred into a bucket and 10 liters of water are poured. The mixture is infused for a day, and then tomatoes are sprayed with garlic water every 10 days.


To combat late blight, even toothpaste is suitable, but it is whitening and only white without dyes. This type of paste always contains many antibacterial additives.

To prepare the product, a tube with a volume of 75-100 ml is diluted in 10 liters of water, stirred until smooth. The finished liquid is sprayed on the bushes in the evening and dry weather.

Applying one, or better at once several of the listed funds in turn, you will certainly be able to cure tomatoes from late blight. And most importantly, you do not have to inhale chemical vapors from purchased fungicides during spraying.

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Secrets of a good harvest: how to spray tomatoes in early summer

To increase the yield of tomatoes and protect against diseases for the entire season, during the flowering of the first and second brushes, you need to spray the plants.

And not just spray, but do it right ...

Summer has just begun, and gardeners are already looking anxiously at the tomato bushes - are they sick, how many flowers they keep and whether the fruits are tied.

During this period, young plants especially need protection from pests and preservation of the formed ovaries. Proper spraying will allow large and healthy fruits to form, make the bushes strong and hardy.

Surely each of the gardeners faced such diseases of tomatoes as top rot, cracking, spotting, late blight. Do not expect a harvest after them. But pests are especially terrible for young plants - whitefly and spider mites.

Only timely treatment with insecticides can save them from them.

Spraying is also effective as a foliar dressing. This is the easiest and fastest way to give your bush the necessary trace minerals.

This method of fertilization is especially effective on heavy, clayey soil or acidic soil. Of course, spraying will not solve soil problems, but it will allow the plants to give a generous harvest in completely imperfect conditions.

Folk ways to combat late blight of tomatoes

Those who prefer to get rid of the disease using folk methods should pay attention to the following options:

Garlic. Its infusion on potassium permanganate is effective. 100 g of garlic heads, stalks or young leaves are prepared in a glass of water. Garlic crushed in any way is infused in water for 24 hours. The resulting product is filtered and lowered into potassium permanganate (0.1% solution per 10 liters of water from 1 g of potassium permanganate powder).

The first application - on the ovary, the second - after 10 days on the fruit. Subsequent spraying - three, with a two-week break.

Whey and iodine milk. The best option is with whole cow's milk, and not with powdered milk. It must be fermented to separate the whey. The latter is bred in half with water, starting spraying with the arrival of July. This serum is more suitable for prophylaxis, which means that you can irrigate almost every day.

A disinfectant against late blight is also cow's milk with water in a ratio of 1:10 with the addition of two dozen drops of 3% iodine tincture. Such irrigation is indicated for use every 12-14 days.

Ash. This remedy is important to "dust", not sprinkle the plants. Application begins after a week of planting tomatoes. Watering the culture, the ash, carefully sifted, is sprayed on the bushes, soil, on the gap between the rows. Further, the procedure is repeated with the tying of tomatoes, but applying only to the space between the rows.

Solutions based on yeast and salt. You can take raw yeast in packs, followed by dissolving in 10 liters of water. When the initial signs of fungus appear, it is important to spray the leaves and stems with this solution, paying special attention to the lower tier of the plants. The salt version consists of 200 g of salt per 10 liters of water. The solution is applied to formed, but not very large tomatoes. It is important to carry out the procedure so that such a film does not wash off after rain or watering. All affected leaves and fruits are removed prior to spraying.


First of all, tomatoes need proper care. Healthy and strong plants have good immunity and they are not afraid of late blight. Experienced gardeners recommend opting for early-maturing varieties.

Such tomatoes will have time to ripen before the appearance of rains and dew (due to the difference in day and night temperatures), which means that the risk of late blight is significantly reduced. Preventive measures include, first of all, adherence to the planting scheme, competent fertilization and the correct irrigation regime.

To begin with, you should choose a variety that is resistant to late blight infection. This will not 100% save you from infecting tomatoes with a dangerous disease, but still, it will significantly reduce such a risk.

Before planting, the seeds must be etched in a pale pink solution of potassium permanganate, soaking them for 20-30 minutes. The seeds are then washed and planted as usual. Additionally, the soil and containers for planting are disinfected with the same solution.

To protect tomatoes from late blight in the open field, you must:

  1. Observe the correct crop rotation and do not plant tomatoes after onions, potatoes, cucumbers, cauliflower, carrots, turnips and beets for 3 years.
  2. Choose the highest place on the site for the tomato garden. If you plan to plant tomatoes in a lowland, you need to make raised ridges.
  3. Create neutral soil acidity before planting with lime-based deoxidizers. Phytophthora prefers acidic soil.
  4. Before planting seedlings in the ground, pour some dry sand into the hole. Plant tomatoes in it.
  5. Plant tomatoes according to the scheme indicated by the manufacturer on the package. Planting too densely reduces air circulation between the plants and contributes to their shading.
  6. In rainy weather, do not water the tomatoes so as not to create excess moisture.
  7. Watering is carried out in the morning, strictly under the root of the bush, without falling on the stems and leaves. It is necessary that the moisture can be completely absorbed before nightfall.
  8. To carry out regular loosening of the soil, providing the roots with air supply.
  9. Avoid excess nitrogen fertilizers. It is imperative to take out potassium and phosphorus in order to strengthen the immunity of plants.

In addition to all of the above, the bushes must be regularly inspected, paying attention to the underside of the leaves. It is important not to miss late blight at the earliest stage.

How to protect tomatoes from late blight in a greenhouse

In the greenhouse, the climate is even more conducive to the appearance of late blight, compared to open ground. A warm and humid environment favors the development of any microflora, including fungi.

To reduce the risk of late blight in tomatoes in a greenhouse, you must:

  1. Powder the seedlings before planting in the greenhouse with a mixture of tobacco dust and wood ash. Treat with mask and protective clothing.
  2. If possible, organize drip irrigation so that water penetrates directly to the roots, bypassing the topsoil.
  3. After watering, be sure to open the vents and doors for ventilation.
  4. If condensation accumulates on the walls of the greenhouse, remove it with a dry cloth.
  5. Carry out preventive treatment against late blight at least 3 times per season.

Whatever means you use, it is better to alternate them with each other in order to avoid addiction. It is most effective to use the treatment scheme recommended by specialists, which will be discussed below.

Prevention of late blight: video

How to carry out correctly?

The technology for processing tomatoes from late blight is quite simple, but it has its own subtleties and nuances that every gardener should know.

  1. It is necessary to choose the weather suitable for spraying - clear, cool and calm.
  2. Prepare the solution. The mixture to be sprayed must be fresh.

If this is a chemical preparation, then it should be mixed in the proportions that are indicated in the instructions, otherwise you can either harm the tomato bushes or not get the proper therapeutic / protective effect. If necessary, let the solution stand for several hours.

Carefully pour liquid into the spray tank.

  • After all the preparatory work, you should proceed directly to the processing of tomatoes. This must be done carefully, trying to spray the entire bush without damaging it.
    • The spray tip must be at least 50 cm from the object to be treated. The nozzle should be with small drops.
    • It is recommended to start spraying from the top, gradually going down. You can also treat the surface near the bush so that the spores found on it are also destroyed.
    • It is imperative to spray the entire bush, including the trunk, and leaves, and fruits and flowers. In this case, it is carefully recommended to process precisely the lower part of the leaves.

    When to spray tomatoes and potatoes from late blight

    To protect crops from late blight, folk remedies should be used not when the plants show signs of disease, but in advance. The first time the potatoes are sprayed at the beginning of budding, and the second - after 10-14 days. At the same time, the first processing of tomatoes is carried out.

    So, over the summer, plants are sprayed on average 4-5 times every 10-15 days.

    Take care of your green pets correctly, do not forget about disease prevention - and no late blight will ruin your crop!

    Personal experience of fighting late blight of our reader from Riga:

    Features of processing tomatoes from late blight

    Whichever method of struggle is chosen, it is worth remembering that late blight quickly "adapts" to the means and they need to be changed regularly. The exception is innovative systemic fungicides and non-addictive biological products.

    Even with simple folk remedies and infusions, it is better to process tomatoes in the early morning or evening, choosing clear, windless days. Any methods require the use of personal protective equipment, the abandonment of metal containers and tools for preparing solutions.

    Means that will help save tomatoes from late blight can be used not only for spraying already diseased bushes. Infusions and decoctions are used both on affected plants and to prevent phytophthora after planting tomatoes in the soil. But microbiological and chemical agents can be used on adult bushes, and for seedlings, seeds and soil.

    Late blight most often gets on tomatoes from potatoes.When processing tomato bushes, it is worth preparing a solution with a margin and sprinkling potatoes as well, which can become a haven for spores and a source of disease next time.

    7. "Copper" piercing

    A well-proven method patented by German scientists: wrapping the roots of seedlings before planting in the ground with copper wire. Our summer residents use copper wire in a different way: they pierce the tomato stem. Microdoses of copper stabilize chlorophyll, stimulate plant respiration and enhance oxidative processes. This strengthens the plant and makes it more resistant to infection. Attention! This procedure is done only when the tomato stalk becomes strong!

    • Recipe: Anneal a thin copper wire (you can clean it with sandpaper), cut into pieces of 3-4 cm. At a distance of 10 cm from the soil, make a puncture of the stem, insert a piece of wire, bend the ends down. Do not wrap around the stem!

    So we got acquainted with various methods of combating late blight of tomatoes. It will be very cool, pleasant and useful if you replenish this piggy bank with your finds and secrets. In the meantime, good luck to everyone in the fight against the insidious infection!

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