Phytophthora-resistant tomato varieties

Tomatoes are the culture most often grown by gardeners and perhaps the most whimsical. Tomatoes often suffer from fungal diseases that can destroy the entire crop. One of such ailments is late blight. It is practically impossible to get rid of it, therefore it is recommended to select tomato varieties resistant to late blight.

Phytophthora resistant tomato varieties

Causes of the disease

Varieties of tomatoes resistant to late blight The ozu are improved every year. Previously, they were represented only by early-ripening varieties, because the outbreak of the disease is observed in the second half of summer. During this period, heavy precipitation begins, frequent temperature changes. All this makes the environment favorable for the development of spores of late fungus. The fungus does not tolerate sunlight, but in shady areas with high humidity it feels at ease and begins to develop rapidly. The biggest problem is that the fungus can remain in the soil throughout the winter, it tolerates frosts and begins to develop when the time comes.

Spores can remain not only in the soil, but also on the seeds and not harvested plants.If you really disinfect the seeds and remove the greens, then it is impossible to get spores from the deep layers of the soil, so people began to pick up low-growing varieties of early or medium ripeness, not afraid of late blight, for planting. But here there is one catch: if early-ripening varieties are planted in order to get a crop, and then sell it and sow new tomatoes, the risk of spreading late blight on the second sowing will be quite large.

Care

Selection does not stand still, and on the market today you can find many varieties that are practically not susceptible to fungal diseases. Nevertheless, it is worth choosing varieties depending on the climatic conditions of your region and observing the elementary rules of care.

For example, southern heat-loving plants should not be grown in the cool important climate of the Moscow Region. If tomatoes are grown for sale, then in the climatic conditions of the Moscow Region it is recommended to plant vegetables in greenhouses: it’s easier for the gardener to provide the necessary conditions, to reduce humidity in the greenhouse without any problems.

Are there tomatoes-resistant tomatoes

Many gardeners ask whether there are tomato varieties that are not afraid of late blight. The truth is that only purple varieties belong to these. They are more resistant to viral diseases, while the best Dutch tomato hybrids are affected by this disease.

When infected with a phytophthora fungus, the affected plant must be completely removed.

Today there are hybrids that still remain viable after infection and even yield a crop. They are sick for a long time, but they recover over time, however, the yield is significantly reduced. In any case, it is necessary to carry out the prophylaxis of fungal diseases, otherwise the troubles cannot be avoided. In many respects, the susceptibility to diseases will depend on the weather in the summer. Conscientious care plays an important role in the greenhouse.

Purple tomatoes

Tomato violet varieties

are resistant to late blight. Among the varieties that are most resistant to the fungal disease described, violet varieties occupy a special place.

1. Phytophthora tolerant variety of purple tomatoes The black prince is very popular among gardeners. The bush grows up to 2 m in height. The fruits are distinguished by excellent taste and high weight, about 300 g. You can collect up to 8 kg of tomatoes from one bush.
2. Another late blight resistant variety is Black Pear. Its fruits are pear-shaped, ripen 100-120 days after planting. It is suitable for cultivation in open ground and greenhouses.
3. Violet brandy produces raspberry-red fruits weighing about 400 g each. Mid-season variety, terminant, reaches a height of up to 1.8 m.It feels great in open ground and in greenhouses.
4. The black bunch F1 is not infected with late blight, even if there are already sick plants nearby. Taste characteristics are beyond praise. This variety acquires a dark color only under sunlight, when grown in a greenhouse with insufficient lighting, the fruits of this plant will be pink.

Phytophthora tolerant varieties

In addition to violet, other late blight-resistant varieties of tomatoes are observed. All of them are characterized by short stature and early ripening.

1. One of these varieties that are not susceptible to fungal diseases and late blight, in particular, is the Little Prince. The fruit ripening period is 80-90 days. The fruit of such a plant is considered universal, although it is compact. It is used to prepare all kinds of pickles, tomato, its mass reaches only 45 g. It can be grown in open ground and in greenhouse conditions. The fruits ripen all at the same time; they are distinguished by excellent taste. Varieties of tomatoes of early ripeness, not susceptible to late blight, can also be tall.
2. Variety Akademik Sakharov reaches 2.5 m in height. This species is distinguished by large fruits of 0.5 kg each. The first fruits are harvested already on the 105th day after sowing the seed material. Bright red tomatoes are suitable for fresh consumption and for making sauces. Delicate flesh sweetish, with a slight acidity.The variety is grown in open ground or in a greenhouse.
3. The next representative resistant to late blight is Gnome. It is planted in open areas. Low bushes are well suited for planting in moist northern regions. Due to the increased cold resistance, seedlings can be planted already in late April or early May. The height of the bushes reaches 50 cm. From each bush you can collect 3 kg of tomatoes within 90-100 days after planting.
4. Soyuz 8 is another variety resistant to fungal diseases. It can be used for growing in greenhouses. Its main advantage is high yield: from one bush, subject to all care rules, 15 to 20 kg of fruits are harvested. Another advantage is the long shelf life, which allows transporting products over long distances.

Which crops to prefer

Choose domestic tomato varieties

Hybrid Dutch tomatoes are often found in household plots. Dutch tomato varieties, although resistant to phytophthora, do not differ in good taste, and therefore it makes no sense to grow them. That is why the most attractive varieties resistant to late blight are domestic.

In the northern regions, low-growing early ripening varieties are grown.This is justified by the fact that a compact bush is easier to hide from frost.

Greenhouses are not the best option for growing some varieties, especially since in open ground the yield is higher. Among the most popular domestic varieties not susceptible to fungal diseases, the following are distinguished: Alaska, Snowdrop, Polar Ripening, Snow Tale, Dubok, Taimyr.

Prevention

Spores begin to multiply in the appropriate environment, so the variety is chosen, depending on the climate of the region. Tomatoes should not be planted in the place where the potato used to grow, because it is in the potato tubers that spores of the fungus most often settle.

Before planting, choose which plants will grow next to the tomatoes. It is better that it be a salad or legumes. If the weather has been wet for a long time, the lower leaflets must be removed: they become the carriers of the infection.

Planting Rules

For the prevention of late blight, it is recommended before each put a piece of chicken droppings in front of the hole or water the sprouts with broth of horsetail.

It is recommended that you seed the seeds before sowing. It is undesirable to plant sprouts at close distances from each other: this blocks the access of nutrients, and also contributes to the rapid spread of viral diseases.

Watering should be carried out strictly on schedule.Only soil should be shed, being careful not to spray liquid on the leafy part of the plant. To protect against dampness and temperature changes at the first stage of growth, it is recommended to cover the plants with polyethylene or plastic caps.

Actions during infection

If you still could not avoid infection, first remove all leaflets that have changed color. Missing plants are removed from the site and destroyed. Healthy tomatoes are treated with a solution of copper sulfate or copper oxide.

Some tomato hybrids tolerate phytophthora with proper care.To avoid further spread of the disease, preference should be given to early ripe varieties or varieties of purple tomatoes. Violet varieties are recognized as the most resistant to fungal diseases, but this does not eliminate the need for preventive measures.