How important are fungicides for potatoes?

How important are fungicides for potatoes?

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It happens that the loss of potato yield, under the influence of pests and various diseases, reaches incredible proportions.

Then comes time of special chemical treatments, the main of which is considered to be the treatment with fungicides. Today, the use of such preparations is the main component of excellent yields.

Fungicides - drugs based on chemicals, capable of both destroying the disease and preventing their development.


By the nature of the effect, fungicides are divided into 3 groups:

  1. Protective, which are aimed at preventing the development of potato diseases. Such drugs perform only a protective function, therefore cannot cure already infected crops.

    They have superficial localization and are not able to penetrate inside. They mainly act on the reproduction of pathogenic fungi. The range of action of such drugs is very narrow.

  2. Treating, which able to completely destroy mushroomsalready penetrated into the plant.
  3. Immunizing, which, getting into plant tissue, change the metabolism of the plant and prevent infection with various fungal diseases or disrupt the course of disease processes that determine the onset, course and outcome.

Depending on the method of distribution, fungicides are divided into:

  1. Contact, affecting the focus of the disease only with direct contact with it. Such fungicides are unable to penetrate the plant and only spread to the surface.
  2. Systemic, able to penetrate and move throughout the body of the plant, destroying pathogenic flora, regardless of its localization.

How do they work?

Exposure to fungicides occurs in the following ways:

  • violation of the respiratory processes of fungi;
  • suppression of nuclear division in fungal cells;
  • the formation of natural antibiotics in the plant;
  • the formation of necrotic areas that serve as a barrier for pathogens on the way to healthy tissues;
  • oppression of energy exchange;
  • suppression of the formation of nucleic acids, etc.

Potato fungicides are produced in the following forms:

  • powdery;
  • liquid.


Preparations, depending on the form of release and purpose of useare applied in several ways:

  1. Seed dressing.
  2. Spraying, for this method, hand sprayers or agricultural machinery are used.

    The frequency of spraying depends on the duration of exposure to the drug, the speed of vegetation of the plant, as well as the risk of recurrence of the disease.

  3. Application to the soil, this method is used to combat pathogenic flora directly in the soil. Most fungicides for soil treatment are not selective, which allows them to destroy both fungi and bacteria, and pest larvae.

From late blight

The most popular fungicides for potatoes against late blight and Alternaria are:

  • Abiga Peak;
  • Buzzer;
  • Poliram DF;
  • Quadris;
  • Revus;
  • Cuproxat;
  • Ridomil Gold MC;
  • Metaxil;
  • Sectin Phenomenon;
  • Acrobat MC, etc.

The most important component of a comprehensive measure for the protection of potato plantations is strict adherence to the terms of potato processing.

The first (prophylactic) spraying is performed before the onset of the disease when closing the tops in rows (bush height 15-20 cm).

The second processing is done 1-, 1-5 weeks after prophylaxis.

Subsequent processing is done every 7-8 days (in case of drought) or 4-5 days (in rainy weather) until the haulm is harvested.

Weak seasonal development of diseases implies 1-2 treatments, moderate development - 3-4 treatments, intensive development - at least 6.

For preventive treatment, you can use both contact and a mixture of contact and systemic fungicides. Further processing is carried out only with contact drugs..

To preserve the potato crop, it is sometimes necessary to apply herbicides for weeds and insecticides for the Colorado potato beetle. Read about these chemicals on our website.


Today there is a drug that has positively proven itself in the fight against a complex of potato diseases.

Fungicide for potatoes "Flanobin" - a two-component drug with contact-translaminar exposure.

This drug has many advantages:

  • high level of protection of potatoes from diseases;
  • long-term action (up to 2 weeks);
  • good antisporulation;
  • high resistance to atmospheric precipitation;
  • increases stress resistance of plants;
  • reduces the risk of tuber infection.

Most of the drugs aimed at combating potato diseases have a low degree of toxicity for warm-blooded animals and humans. But still it is worth observing safety precautionsworking with them.

Some fungicides are capable of infecting beneficial microorganisms, birds, insects, fish, etc. can lead to disruption of biological balance.

In order to avoid or minimize the negative impact of drugs on the environment you should strictly adhere to the standards indicated on the package consumption, terms and methods of use. It is also important to use fungicides only on recommended crops.

Watch the video: how to control potato late blight?Potato late blight. Spreads quickly in foggy and cloudy weather. (May 2022).