Phytophthora on tomatoes: methods of struggle and prevention

In late summer or early autumn, gardeners often encounter dark spots on tomatoes that gradually spread over the surface. This is the so-called phytophthora on tomatoes. Methods to combat it include the use of certain chemicals and folk methods of prevention. Let us consider in detail what the disease is and how to fight it.

Late blight

Phytophthorosis is considered the main disease of tomatoes in film greenhouses and in open ground. And in the ground affected crops of late varieties. This is due to the fact that favorable conditions for the spread of the disease (drops of dew arising from the difference between day and night temperatures) are formed in late summer or early autumn.

When spots are detected, gardeners immediately realize that they can have phytophthora on tomatoes. "What should I do?" - they ask a question. First you need to find out whether this is true, because the spots can be in other diseases.

Phytophthorosis affects fruits, stems and leaves. On the edges of the leaves there are brown spots, below - a white coating of sporulation. On stems and petioles stains are elongated, without plaque. Fruits are sometimes covered with hard brown rot. Source of infection - affected landing Potatoes and oospores, which are retained in the soil on plant residues.

Phytophthora on tomatoes: methods to combat the rules of cultivation

1. Places for tomatoes need to be constantly changed and not planted potatoes, as the spores remain in the soil for a long time.
2. Seeds of tomatoes are decontaminated with potassium permanganate or vitarose, since they can also contain fungal spores.
3. Potatoes and tomatoes are burned or buried in depth, as spores are carried by the wind and remain in the soil until next year.

If you are looking for an answer to the question of how to protect tomatoes from phytophthora, then you know that compliance with these three rules will significantly reduce the risk of disease. Also, it is necessary to plant only strong plants, to take care of them in time and to feed them: strong tomatoes are less susceptible to late blight.

In carbonate greenhouses it is recommended to grow resistant hybrids formed in 1 stem, without thickening, and the greenhouses themselves should be well ventilated. Watering the plants for infection is recommended 1 time per week in the absence of precipitation.

Phytophthora on tomatoes: methods of fighting scientifically

Now special preparations are available for spraying the tomato culture. Popular means on the basis of a haystick - "Fitosporin-M", "Baksis", "Alirin-B", "Gamair". When using them, the accompanying instructions must be observed. Immunocytophyte, Epin, Zircon are well known from immunity stimulants.

There are wide-spectrum fungicides that protect against a complex of diseases. These are "Quadrice", "Ridomil Gold", "Mefenoksam", "Mankotseb", "Thanos", "Famoxadon", "Cimoxanil" and others. Copper vitriol is also used, but it is already receding into the past, and does not always help.

Remember that this is an insidious disease that can destroy the entire crop - phytophthora on tomatoes. Methods of struggle can be spraying plants and observing simple techniques of farming techniques, such as changing beds, disinfection of seeds and removal of potato residues and tomatoes. Practice shows that this is enough to prevent the fungus from hitting the culture.