Why roses turned black: causes and treatment
Rose is the real queen of the garden, and it would be unpleasant for any gardener to find dark spots on her bushes. Such browning not only spoils the appearance of the plant, but also threatens its continued existence. Learn from the article why roses turn black, how to get rid of these spots and prevent their appearance in the future.
The basic rules of growing roses
At a room rose, immunity is rather weak, unlike a garden one. And in general, a garden plant has fewer requirements regarding location and care.
- choose the right place: it should be a sunny meadow, but without drafts;
- avoid clay and sandy soils: roses grow poorly on them;
- excess moisture will not benefit the bushes, so do not plant them in areas where groundwater passes close to the surface;
- Do not forget to feed the plants, especially during the period of active growth and flowering (you can do this every 10-15 days);
- carry out spraying. Roses are sensitive to heat, autumn cooling, lingering rains. To strengthen them, spray the bushes with solutions of “Zircon”, “Epina”, “Ecosila” or their analogues at this time;
- water the roses enough once a week, if the weather is too hot - twice. Pour a bucket of warmed water under the root onto 1 bush so that the liquid penetrates 20-30 cm deep.
Why are the roses blackened
Rose refers to sensitive plants that are susceptible to pests and various diseases. A sign of problems with the flower will be the appearance of black spots. Depending on the location of the labels on the rose, you can determine the causes of their appearance.
The causes of the appearance of black spots on the leaves
Most often, the leaves darken due to black spotting (marsonins) - a disease provoked by a fungus that occurs in warm, humid conditions.
Find out what to do if the rose has yellowed leaves.
Typically, such spots appear in the summer, when the heat is often replaced by warm rains.
Not only moisture, but also excessive dryness can cause blackening of the leaves. Under such conditions, the plant can get bacterial cancer, which is why watery dark spots appear on the leaves. The leaf plate weakens under their influence, so the leaves dry, crack and fall off.
Did you know? The aroma of roses is recognized as one of the strongest antidepressants in the world.
Bacterial cancer can also appear on the stems of the plant. First, brown burn marks become noticeable, as if pressed into the stem, which quickly spread to new places.
Blackening of buds
Very sad for gardeners when the buds turn black. When the long-awaited flowers are about to appear, dark spots appear on the young buds. This is how powdery mildew manifests itself - a fungus that was not promptly stopped at the stage of damage to leaves and stems. It is characterized by a taupe of gray-brown hue covering the buds and leading to deformation of the flowers.
Blackening of cuttings
If you are going to propagate a pink bush with cuttings, then be careful: often cut off stems turn black and do not want to grow roots. Such instances have to be thrown away.
Important! Do not forget to treat the shoot with a growth stimulator before planting: this will increase the chances of successful rooting.
There may be several reasons for this:
- the cuttings did not have enough moisture, or it froze;
- the shoot was taken from a diseased plant;
- there was a fungus in the soil, which struck a young seedling.
What to do and how to treat the plant
Regardless of the disease, the first step is to remove the affected leaves or (if possible) sections of the stem to prevent the spread of the disease. The rest of the bush is preferably treated with specialized preparations “Profit”, “Ridomil Gold”, “Topaz”, etc.
Find out what to do if the leaves fall off the rose.
If the disease has already covered most of the plant, then it is better to get rid of it and completely burn it. However, if there are live stems, try to save them by spraying with 5% solution of copper sulfate and rubbing ulcers, stains with garden varieties.
It is always easier to prevent the occurrence of a disease or pests than to save a plant from them. As prevention and strengthening the immunity of garden roses, the following methods are used:
- after winter, remove the shelter from rose bushes gradually - if you do this too early, the plant will freeze, but later opening of roses will provoke the development of harmful microflora due to excess heat under the shelter;
- in the first spring days, for the appearance of leaves, treat the bush with a 1% Bordeaux mixture. The same should be done before sheltering the flower for the winter;
- when the leaves appear, it will not hurt to fumigate them with ash, and later - repeat this technique 2-3 times per season;
- monitor the amount of fertilizing: an excess of fertilizers provokes the appearance of powdery mildew;
- do not allow thickened plantings of rose bushes;
- avoid high humidity if possible;
- if you plan to plant roses on the site, be sure to pre-treat the soil with a weak solution of potassium permanganate;
- young bushes before planting for 20 minutes, dip in 1% solution of copper sulfate to disinfect.
Did you know? On average on St. Valentine around the world sold about 3 million roses.
Dark spots on rose bushes are a bad sign, but if you notice the danger in a timely manner, the plant can be saved in most cases. However, it is still better to prevent diseases and treat bushes at the beginning of the season, reducing the likelihood of problems.