Black spot on roses: how to treat and how to get rid of, treatment products

Black spot is one of the most common fungal diseases of roses, so it is important to know how to treat it. When affected by this infection, rose bushes quickly lose their attractiveness, as the disease progresses rapidly. This means that you should also respond immediately.

Reasons for appearance

There can be several reasons for this disease:

1. When warm, humid weather lasts for a long period of time, ideal conditions are created for fungi to reproduce. Therefore, in such weather, roses often suffer from black spot.
2. If the rose bush grows in a lowland or in a place that is too dense, then the risk of this disease also increases. Indeed, in such places, air circulation is slowed down, and moisture does not evaporate so actively.
3. The cause can also be improper feeding, its lack or excess.
4. One of the reasons is the lack of calcium in the soil where the bushes grow.

Important! Black spot fungus spores are carried by wind, water or insects, so it is important to treat the diseased plant in order to prevent disease in other bushes.

What is dangerous for plants

This disease is especially dangerous for young plants. Affected bushes develop slowly, young branches do not become stiff and shed their leaves. This is fraught with freezing during the period of frost. Even if the roses successfully survive the winter without proper treatment, they will die after 2-3 years.

Signs and symptoms of bush damage

Usually spotting appears in the second half of summer. Often there are several outbreaks of the disease in one season. Leaves and young shoots of bushes suffer.

Growers may experience the following symptoms when infected:

• stopping plant growth and development;
• the appearance of dark spots on the foliage, which increase in size and quantity;
• spots are sun-shaped;
• spots coalesce over time;
• the disease proceeds from the lower parts of the bush, and gradually moves up;
• leaves with spots begin to turn yellow, curl and crumble;
• bushes become much rarer;
• the number of flowers is decreasing.

Means and technology for the treatment of rose bushes

After the gardener is convinced that the bushes are affected by this particular disease, you need to start treatment with drugs.

Quick

This is a complex fungicide with a pronounced therapeutic effect and a long-term preventive effect in the fight against fungal infections. After 2 hours, the active substance spreads throughout the vascular system of the bush and begins to act.

A significant advantage of this preparation is the possibility of processing in any phase of plant development. "Skor" is sold in the form of an emulsion concentrate, packaged in ampoules or vials.

For the treatment of black spot, the drug is diluted at the rate of 5 ml per 10 liters of water. The fungicide is first dissolved in a small amount of warm water, and then gradually adjusted to the desired volume. The solution is prepared immediately before processing.

Abiga Peak

This fungicide is used to combat fungal and bacterial diseases of all kinds of plants. When processing evenly and densely adjoins to a surface of plants. For a long time remains on bushes, thereby protecting them even in adverse conditions. The active substance of the drug is able to work even at low temperatures.

For spraying roses, the preparation in the amount of 40-50 ml is dissolved in 10 liters of water. First, the medicine is dissolved in a small volume of water, and then brought up to 10 liters. The prepared solution should be used within 24 hours.

Spraying is carried out twice, in the morning or evening. The break between treatments should be 2-3 weeks.

Ridomil Gold

Fungicide "Ridomil Gold" is used to get rid of different types of fungus, including the one that causes black spot.When treated with this drug, a kind of protective film appears on the leaves and stems of rose bushes, which destroys the fungus. "Ridomil Gold" is effective at any stage of the development of the disease.

To prepare a working solution, you need to dissolve 25 g of the substance in 10 liters of water. Immediately after complete dissolution of the drug, processing can begin. After half an hour, the treated plants can be watered. Do not wash away the medicine and prolonged rains. Processing is carried out 3-4 times per season.

This fungicide is safe for all plants, but its residues should not be poured into water bodies. This will have a detrimental effect on their residents.

Bordeaux liquid

Bordeaux liquid is a mixture of slaked lime and copper sulfate. Effectively fights against fungal diseases of plants. It is not only a fungicide, but also a bactericide. Among all fungicides, it has the highest adhesion.

The prepared solution has a sky-blue color with a neutral or slightly alkaline reaction. A highly alkaline solution will not adhere well to plants, and therefore will be ineffective.

Bordeaux mixture is used to treat rose bushes in early spring, and the soil around the plant is also sprayed. To do this, dilute 200-300 g of the mixture in a bucket of water. In the summer, the treatment is repeated 3-4 times with a frequency of 7-10 days, diluting 100 g of Bordeaux liquid in a bucket of water.

Previcur Energy

Fungicide has a protective and growth-stimulating effect. Within an hour after treatment, the active substance completely saturates the plant. Its protection extends not only to treated rose shoots, but also to new leaves and shoots. Increases the immune system of bushes and their resistance to fungal infections.

To prepare a working solution, dilute 15 ml of the fungicide in 10 liters of water.

Topaz

This is a systemic fungicide that is used to treat and prevent fungal diseases. Its effect lasts from 14 to 18 days from the date of processing.

The tool is able to stop the development of the disease within 2-3 hours after spraying the bushes. It can be combined with other preparations to achieve comprehensive rose protection.

One of the advantages of "Topaz" is its economical consumption. For 10 liters of water you need only 4 ml of the drug. Prepare the product before use and spend everything at a time. Processing is carried out in the morning or in the evening in calm weather.

Profit Gold

This fungicide contains, in addition to the active substance, manganese and zinc. These trace elements improve the functioning of enzymes.

Used to treat roses and provide long-term protection against further infestations. To prepare the solution, you will need 4 g of medicine, they are diluted in 10 liters of water.

Be careful when working with the drug, as it is quite toxic to humans and animals.

Prevention measures

In order to avoid or at least reduce the risk of black spot disease, certain preventive actions must be taken.

Optimal Growing Conditions

Before planting rose bushes in your area, you need to think not only about where they will look more beautiful, but also about where they will be safer:

• shrubs should be planted in areas well warmed by the sun;
• the soil should be light, not retaining moisture;
• water should not accumulate under the bush;
• you can not plant roses too close to each other or to other plants;
• water moderately.

External inspection of the bush

It is important to periodically inspect the bushes. After all, a disease detected in time will make it possible to get rid of it faster and prevent it from spreading.

Removing weeds and loosening the soil

Timely removal of weeds will reduce the spread of pathogens and allow the sun's rays to better warm the soil. Loosening the soil under the bushes also contributes to the drying of the soil and makes it possible for oxygen to reach the roots of the bushes.

Feeding rationing

It is necessary to feed rose bushes, while certain norms should be followed. Potassium fertilization is carried out from spring to autumn. The first feeding is carried out at the end of May, the second - at the beginning of June, the third - at the end of July, then - in mid-August and early September.

Feeding with liquid products is carried out only under the root. It is impossible to carry out processing in the evening and at night.

Disease and insect treatment

Such treatments should be carried out in a timely manner, as diseases and insect attacks significantly reduce the immunity of roses. And in the future, shrubs become more vulnerable to black spot and other fungi.

Pruning in time

Affected shoots should be removed immediately after opening the bushes from wintering. Trim them to he althy tissue. Slices are treated with garden pitch.

Disinfect the instrument

After each cut pink branch, the secateurs are treated with alcohol, vodka or a strong solution of potassium permanganate. Other alcohol or chlorine solutions will work as well.

In autumn, remove dry leaves and dig up the soil

Dry foliage should be removed in autumn, it can become a shelter for pests and fungus spores. They also remove the top layer of soil and dig up the area around the bushes. Foliage and removed soil should not be sent to the compost heap, so as not to infect it. Better burn them.

Choose resistant varieties

It is necessary to remove varieties from the plot that begin to get sick most often and earlier than others. When buying new rose seedlings, you need to give preference to varieties that are more resistant to diseases. After all, breeders are constantly working to increase the resistance of roses to fungi, including black spot.

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