How to deal with blight on tomatoes, treatment of tomatoes at their summer cottage

Having found signs of phytophthora on their site, every gardener begins to sound the alarm. In the article we will tell about everything related to the disease and how to fight the blight on tomatoes in the greenhouse and in the open field.

What is phytophthora: causes and signs of the disease

If you have not encountered the blight and do not know what it is, then, most likely, you have not tried to grow tomatoes in your garden. Phytophthora is the most dangerous disease of this plant, which is caused by the fungus late blight, which means “plant eater” in English. With its rapid development, it can destroy the crop of tomatoes in just a few days.

Causes of phytophthora

At first, this infection infects potatoes, and after it switches to tomatoes. Therefore, one of the reasons for their infection is the proximity to the potato. Infection occurs because of high humidity, low or sudden changes in temperature, lack of sunlight, thickened planting of tomato bushes, and an excess of nitrogen.

One can notice the appearance of phytophtoras on plants in August and July. At this time, the day is still hot, the night is already cold, and in the morning there is a lot of dew, evaporation of which occurs slowly, especially from densely planted bushes. This moment is the best for the development of phytophthora.

Signs of phytophtora on tomatoes

At the first signs of phytophthora on tomatoes, black spots first appear on the leaves, then the fruits suffer, and after them the stem is also affected. Black spots on the leaves in the rain are covered with a light oily bloom - this is a fungus. The inflorescences of tomatoes very quickly turn yellow, then turn black and fall off. Fruits become covered with black-brown traces, which soften over time. The stem is covered with uneven black spots.The disease rather quickly inhibits the bush, which subsequently leads to the death of the plant.

Phytophthora: how to properly handle tomatoes in open ground

Tomatoes which are grown up in an open ground are most subject to this disease. And therefore, in order not to face this problem, it is necessary to carry out mandatory prevention.

Disease prevention

Let's figure out how to protect tomatoes from phytophthora. In order not to run into her in your garden, You must adhere to the following rules:

1. The infection infects young bushes due to untreated soil, so be sure to remove the weeds from the garden beds and do not plant tomatoes after potatoes and other crops that are also susceptible to phytophthora.
2. Do not place the bushes very close to each other, as in the wet year this will trigger the development of phytophthora.
3. Watering of tomatoes should be only at the root, as the water on the leaves can cause disease.
4. Place for growing tomatoes should choose a well-lit.
5. Do not overdo the amount of nitrogen fertilizer applied.

Tomato Treatment

If you prevent the disease did not work, you need to know how to deal with blight on tomatoes. It is completely impossible to get rid of it, since the disease spreads from bush to bush and appears immediately on several plants. The first thing to do in this situation is to isolate the affected bushes from healthy ones. It would be proper to uproot them and burn them immediately to prevent them from spreading. If the phytophtora struck a large number of bushes, then chemical active substances will be needed.

When late blight of tomatoes treatment is carried out with preparations in powder form, which are diluted with water and sprayed on plants. The most effective of them are boric acid, "Gamar", "Fitosporin".

How to protect tomatoes from phytophthora in the greenhouse

Stagnant air and the evaporation of moisture are extreme conditions for growing tomatoes in the greenhouse. In this room, even though plants are less likely to be affected by diseases (since there is no direct source of infection), but if this happens, then their spread is more intense. In order to prevent the defeat of tomatoes by phytophthora, greenhouses should be regularly aired and watered the bushes rarely, but many.

Spraying for prophylaxis

A very important question is how to spray tomatoes from phytophtoras, since the abundance of chemicals can make the fruit poisonous and unsuitable for consumption. In addition, during the treatments, you can ruin the bushes themselves, causing them to rot. In order not to harm the plant, you need to know how to splash tomatoes from diseases.

In preventive measures, it is necessary to water the tomatoes with a solution of copper sulphate within a week after planting. Then, after another five days, it is necessary to treat the bushes with a decoction of horsetail, after which the leaves are sprayed with potassium iodide diluted with water. And after another five days, the plants are treated with Epin.

For prophylactic treatment, a solution of acidic serum of 2 liters, a glass of ash and one spoon of honey per bucket of water will be suitable. This solution is sprayed with bushes every week. The most favorable time for all procedures is the first half of the day.

In order to avoid the reasons for the development of phytophthora in greenhouses, it is necessary to remove dust and cobwebs, monitor the cleanliness inside the room.

Treatment of phytophthora on tomatoes

If there was a phytophthora on tomatoes, then for many gardeners the question becomes how to deal with this scourge. Treat phytophthora in two ways:

• using chemical active substances;
• using folk remedies.

When phytophthora on tomatoes are treated with chemicals such as "Alirin-B", "Gamar", "Baikal EM-1". Another effective remedy is Bordeaux liquid.

How to deal with late blight folk methods

We list the most common folk remedies from phytophtora on tomatoes:

1. Tincture of garlic with potassium permanganate. You will need 100 g of garlic minced in a meat grinder, which is poured with a glass of water and left for 24 hours. After a day, filter and dilute with 10 liters of water and 1 g of potassium permanganate. Spray the bushes need every other week.
2. Milk serum.In a 1: 1 ratio, whey is diluted with water and tomatoes are treated from July daily.
3. Ash. Seven days after disembarking and when setting fruit, ash is sprayed between rows before watering.
4. Tincture of rotten straw or hay. You need 1 kg of hay to pour 10 liters of water, add a handful of urea and leave for 3-4 days. After a while, strain and process the bushes in 1.5-2 weeks.
5. Iodine with milk. They take 10 liters of water, 1 liter of nonfat milk, 15 drops of iodine, mix everything and process the bushes every two weeks.
6. Salt. For one glass of salt, take a bucket of water and process large green fruits once a month.
7. Copper sulphate solution. On a ten-liter bucket of water add 2 tbsp. l copper sulfate and the resulting solution is poured over the plant.
8. Yeast. At 10 liters of water will need 100 g of yeast. Treat the plant when phytophthora appear.
9. Wrapping the roots of seedlings with copper wire before planting or piercing the stems of tomatoes. It is necessary to heat the copper wire and cut it into 4 cm pieces and then, at a distance of 10 cm from the ground, pierce the stem, insert the wire and bend its ends down.

The fight against late blight on tomatoes with folk remedies is as effective as the struggle with chemical agents.

Varieties of tomatoes resistant to Phytophthora

Unfortunately, there are no varieties of tomatoes that will be completely resistant to phytophthora. Despite their great diversity, there are less and more resistant to the disease tomatoes.

For growing in greenhouse conditions are more suitable varieties of the determinant species. They are low, early and bring a good harvest.

Determinant Tomato Varieties:

• Grandee - stunted plants with fruit size up to 0.8 kg.
• Oak - bright red fruits weighing up to 0.1 kg.
• Perseus - red tomatoes, rounded flat shape.
• Persimmon - delicious orange tomatoes weighing up to 0.3 kg.
• Orange miracle - orange fruits came down flat, with a high content of beta-carotene.

Indeterminate varieties are characterized by tall and large fruits. They can be grown both in greenhouses and in the open field.A prerequisite for their normal development is holding a pasynkovaniya.

More resistant varieties of the indeterminant species are:

• De Baro. Tomatoes in the form of cream weighing up to 80 g
• Watermelon variety has green stripes, similar to watermelon. Fruits weighing up to 0.1 kg.
• Grandma's secret. Red-colored fruits are very fleshy, weighing up to 1 kg.
• Dragon Heart. Fruits are crimson-red with a fleshy core and weighing up to 0.8 kg.

Prevention of phytophthora

Protecting tomatoes from phytophthora will help proper care of them. Care is carried out depending on the type of development, which, in turn, is divided into generative and vegetative.

When the vegetative method of growing plants grow quickly, but the fruits are formed slowly. And because of late fruit formation, especially in rainy summer, the phytophthora will not be long in coming. And to prevent this, you need to carry out pasynkovanie. This will ensure improved air circulation and accelerate the growth of the fruit.

When the generative method is active fruiting. A large number of tomatoes on a bush leads to a stressful state of the plant, which reduces its resistance. In order to prevent the occurrence of phytophthora, it is necessary to regulate the number of tomatoes on a bush. At an unfavorable time, it is better to reduce the number of fruits and remove peripheral buds. So you will ensure rapid maturation and increase plant resistance to diseases. In order to prevent the occurrence of phytophthora in rainy weather, even an immature crop can be harvested, this will help the plant to fight the disease.

How to save and consume affected tomatoes

Tomatoes that have already caught phytophthora can be preserved by heat treatment. To do this, you need to pour water into the basin at a temperature of 60 ° C and lower the affected fruit into it. Be careful: tomatoes should warm up, not cooked. When the water cools, add a new one until the tomatoes are fully heated. After the water treatment, the tomatoes are dried and placed in a dark place or on the windowsill for ripening. During warming up, spores of phytophthora die, and then tomatoes can be eaten.They can also be canned. At defeat of fruits to full blackening thermal influence will not help, and they should be utilized.

A hundred percent free from phytophtora can not guarantee any of the ways. However, to prevent the occurrence of the disease and to fight against late blight of tomatoes is in your power. To do this, you must comply with all the above recommendations, to carry out preventive measures, and then you will get a large crop of healthy tomatoes.