The appearance of the flower worsens. Why do room roses turn black stems and other parts of the plant?

Growing roses is a troublesome business, and the reward for your efforts is rich flowering. At home and street roses, both the stems, the leaves and the buds themselves can blacken. Finding an annoying manifestation, the question arises why roses can turn black and how to deal with it. There are enough reasons for this ailment to arise.

Black spots on pink flowers not only spoil their delicate appearance, but also harm the plant. The best remedy is to prevent black spotting on roses.

The nuances of blackening street and indoor flower - are there any differences?

The difference between garden and home roses is only in the size and conditions of growing plants. The main care for roses in the garden, as well as for roses at home, is regular watering, maintaining soil moisture at the required level, as well as pruning bushes to provide relaxation in the winter.

Garden and indoor roses are also prone to various types of blackening, so caring for roses is important in any case. Garden and indoor roses can get powdery mildew and become covered with a thin cobweb, which also manifests itself in the form of blackening.

What is this disease, why is it?

Blackening on roses is a sign of a flower's disease, which can occur for various reasons. But there are not so many of them, which means that it will not be difficult to determine the problem.

Appearance and reasons

• A clear sign of increased humidity is the presence of blackness on the outer petals of the bud and general wilting, accompanied by softening and mucus. In this case, it is necessary to improve drainage, and loosen the soil.
• The sign of "peronosporosis", or in other words, "downy mildew," is the blackening and falling of the outer petals, as well as various spots with a coating on the leaves on the underside.
• Gray rot manifests itself as black mucous formations on the buds and brown petals.
• Thrips is characterized by blackened or brown spots on the petals, which acquire a gnawed appearance. In addition, when breaking a bud, you can notice small insects.
• The cause of blackening of roses can be viral and fungal diseases, of which there are more than a dozen. Usually, they develop leaves and green shoots, and such fungi do not live on the petals. Blackening of buds is most often found in thickened rose gardens, as well as in conditions of poor ventilation and lighting, high humidity inside the bush.

Plant parts susceptible to disease

Leaves - more precisely, their upper side is covered with whitish spots of rounded shape, on which later black fungal spores appear. Then the spots darken, swell and grow, and the diseased leaves curl and fall. As a rule, these are indicators of such a fungal disease as "black spotting", which is most often manifested on garden roses in a rainy, warm summer.

In dry weather, the blackened parts crack and dry, forming holes with a dark edging. In damp leaves completely blacken and then fall off.

• Cuttings - with increased humidity, a fungal disease affects the cuttings, which spreads quite quickly. Blackening is also found on frosty cuttings or taken from unhealthy roses.
• The stalks - the appearance of rounded indented spots of brown color, their gradual death, in the place of which blackened ulcers form. Damaged stems dry out, a bacterial burn becomes the cause.
• Buds - mostly infected with powdery mildew. It is necessary to comply with the dose of fertilizing. Excess nitrogen and calcium deficiency in the soil contribute to its distribution. This fungal infection begins to affect the leaves and stems, and then goes on to the flowers, which, in turn, are not opened due to damage. The gray-brown coating turns black, the buds and soon die off. Thrips also harm buds.

Effects

• The disease is difficult to cure, it will take time and patience.
• The appearance of infected roses does not look aesthetically pleasing and does not please the eye.
• The disease gradually affects the entire bush and can spread to neighboring plants.
• Such spotting greatly weakens plants and their functions, in particular - reproduction.
• When blackened, the cuttings do not give roots, which means that they cannot be used to propagate roses.
• In an affected plant, the process of flowering buds slows down or stops altogether.
• Formed pink buds are weak, dry and fall off without opening.

Step-by-step instructions for getting rid of blackening

For garden greenhouse roses, humidity must be stabilized, produce ventilation, temporarily remove the mulch that protects the plant. Pathogens most often live in the soil, and under the mulch they are difficult to process. It is necessary to temporarily stop watering, dry the top layer of soil.

It is more difficult to influence the humidity level in open rose gardens due to rains, but in this case the consequences can be reduced:

1. cut off the blackened buds;
2. Thin out the bush as much as possible for abundant ventilation.

For climbing roses, fan the whips, to avoid weaving and unnecessary contact.

Groundcover roses have:

1. Lift the scourges off the ground and lay them on stakes.
2. Replace damaged mulch.
3. You can install a protective canopy from the film.
4. It is necessary to treat roses with Siliplant - this is a universal microfertilizer containing silicon and potassium. For plants under stressful conditions, it is used both as a top dressing, and as an immunomodulator and adaptogen.
5. After the rains stop, you can remove the canopy for favorable sunlight.

In the spring, street roses can turn black if the covering material is removed at the wrong time. Roses are recommended to be opened gradually, depending on the weather. If the insulation is prematurely removed, the shoots may turn black due to returning frosts. If the shelter is overexposed longer, then the pink stems can become infected with an infectious burn, thereby violet-brown spots with a border will begin to form on the shoots.

In order to prevent the disease of roses, it is important to start revealing them 2 weeks before the snow melts.

1. It is necessary to remove snow from the bushes.
2. Slightly open the material for a while for better ventilation.
3. When warming, fully open the roses and carry out sanitary pruning.

Antifungal prophylaxis and leaf treatment

The main thing is to take measures in time:

1. Get rid of semi-dry infected leaves and the entire cobweb with a napkin and water.
2. Roses are processed in different ways. The first week, drugs are used, with the active substance - mancozeb, for example:
   • "Profit";
   • "Ridomil Gold".
3. Further, for the effectiveness of the action, agents containing triazole are used, for example:
   • "Topaz";
   • "Soon."

   During the season, no more than 3 such treatments can be carried out.

4. Garden bushes should be treated in the evening until there is no dew. And before disinfection, water the roots of the plant.

Powdery Mildew Bud Treatment

High humidity and tight fit are not allowed.

1. In order to prevent infection in the flower garden, it is necessary to dip the seedlings in a 1% solution of copper sulfate for 20 minutes before planting. Or prepare a solution of Fundazole in a proportion of 1 tablespoon of the product per 10 liters of water.
2. In sunny weather, treat infected roses with a copper solution, or with a mixture of 50 grams of soda ash, 40 grams of soap diluted in 10 liters of water.

In the season 2-3 times to dust the rose bushes with ash.

Measures to get rid of thrips buds

When the flower petals open, black insects about 1 mm long can be seen there.

It is better to carry out timely prevention. For street roses, it is recommended to dig the soil in autumn and in time to clean the fallen leaves, in which these pests can just winter.

If roses are already hit by thrips, the first thing to do is:

1. Trim infected peduncles from roses.
2. Spray with an insecticide, for example:
   • Intavir
   • "Spark".

   It is important to consider that the drugs will not be able to overtake insects inside the bud, which is why cutting is required.

3. It is also necessary to process the soil with the same insecticide, as there may be insect eggs.

You must be prepared to conduct a spraying course with an interval of 10-15 days. The fight against thrips will be more successful if the drugs are rotated and a new one is used in each subsequent treatment.

Stem Fight

Getting rid of bacterial damage, it is necessary to immediately remove the infected parts, lubricate ulcers and sections with garden var.

Healthy stems and leaves need to be disinfected with a 5% solution of copper sulfate,

For prevention in the spring, before the leaves bloom, the rose garden is sprayed with 1% Bordeaux mixture. When preparing roses for winter, the treatment is repeated.

Cutting Processing

To reduce the risk of fungal infection, when rooting, the soil must be watered with a manganese solution. You should choose a light and loose earth for a home rose and add vermiculite or perlite to it.

Tools should be processed after removing each shoot. The cutting parts are cleaned with a disinfectant, for example 72% alcohol solution or chlorhexidine. You can find them in any pharmacy, and for convenience it is better to choose bottles in the form of a spray.

The process of growing roses is not so simple and you can not do without difficulties. The most common and dangerous disease of a plant is blackening. When signs of blackening on roses appear, measures should be taken to combat it. And these tips will help determine the threat and protect the roses from the disease.

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