Any gardener dreams of a beautiful, fragrant and healthy flower garden. Lush and bright roses are especially pleasing to the eye. But growing these moody flowers cannot be imagined without problems. Very often, various diseases, viruses, fungi and insects spoil the appearance and even destroy royal flowers.
Black spots on rose leaves often appear. What is it and how to get rid of adversity?
Why does black spotting appear?
A parasitic fungus can settle on leaves fallen from stems and diseased shoots. He is the causative agent of this disease. The fungus can even overwinter on shoots, and in spring the gardener will see black spots on the leaves of the rose. At this time of the year, humidity is always increased, so the fungus feels excellent and can quickly launch a “war”. But it is worth remembering that if the flower was infected in the spring, then you can see it only after a month (faster in hot weather). If black spots appeared on the leaves of roses, then it is worth thinking about the plant’s lack of potassium.
Symptoms of the disease
The gardener may not notice the infection of the rose immediately, but if the first signs have already manifested, then the development of the fungus will go very quickly.
It is important to urgently take action. Black spots on rose leaves do not look very aesthetically pleasing. How to treat a fungus will be described below.
The disease begins with the appearance of brown spots with yellow edges on the leaves. Over time, the leaves completely turn yellow and fall. The fungus also passes to the stem, which turns yellow, darkens and withers. As a result, the rose bush ceases to bloom and takes on an unaesthetic appearance.
What can a flower grower do to prevent the infection of a rose?
- Roses are whimsical flowers that require proper care. Do not forget about their pruning, this procedure makes them resistant to external factors.
- It is important to remove the dried parts of the rose bush in time and burn them. It is better to do this at a distance from the flowerbed.
- The basal territory is important to constantly weed and loosen.
- If the summer was too rainy, you can sprinkle the soil around the roses with ash.
- Experienced gardeners spray roses with special compounds, as well as infusion of horsetail, mullein.
- Do not forget about the treatment of garden tools with disinfectants.
- And, of course, the Queen of Flowers’s landing site! It should not be shaded.
Black spots on rose leaves: what to do?
A gardener who is jealous of his flowering favorites can notice the appearance of a parasite fungus on them in time. If signs of black spotting are detected, you must act immediately before the disease spreads. Be sure to cut off the damaged parts of the flower. If you see black spots on the leaves of the rose in the initial stage, use the horsetail infusion. They prepare it like this: 150 grams of dry grass is poured with a bucket of water, insisted for 24 hours, then boiled and filtered. Proportions for breeding infusion with water: one to ten.
Every 10 days, the bush must be treated with sulfur-containing agents. Means with copper in their composition also cope well with a parasitic fungus. In autumn, roses are treated with five percent vitriol, and in spring and summer, soap-copper solution is used. If the leaves of the rose are in black spots that have already spread far, a more thorough treatment is required. You need to purchase Bordeaux liquid and carefully process rose bushes every week. It is important to pour the soil next to the rose with the same liquid. Use the product very carefully, as it is very toxic.
What other remedies can cure black spotting?
In specialized stores you can buy products that contain triazole and mancozeb. In order to obtain an excellent and long-term result, these funds are used in turn. First, for a week, roses are treated with mancozeb products (for example, "Profit"). Then comes the time of preparations with triazole ("Topaz", "Skor"). Bushes are also treated with this liquid for a week (every day).
They process roses in the evening. In the morning this cannot be done because of the rose on the leaves, and in the afternoon - because of the possible heat and direct sunlight falling on the leaves of roses treated with the remedies.
Black Spotting Prevention
It is very difficult to cure infected rose bushes, therefore it is better to take preventive measures to prevent the appearance of this fungus. You need to start the fight with the right purchase of seedlings. Get roses in proven places, seedlings must have all the necessary certificates and documents. Pay attention to the variety of roses - many of them are resistant to the appearance of black spotting, a kind of immunity.
When the purchase is completed, think about choosing a place for planting seedlings. This is a very important condition, because a rose is a whimsical flower. Do not plant roses in the place where these flowers (or any other diseases that are similar to roses) were planted less than 5 years ago. Properly care for the flower garden and constantly inspect them for the appearance of something strange. If you see that, the leaves of the roses are covered with black spots, begin treatment immediately! A rose can die quickly from a harmful fungus.
Other types of spotting roses
The flower queen can suffer not only from black spotting. How to recognize other types of disease?
- Cercosporosis is a brown spot. With this type of flower lesion, its leaves cover brown spots. Their size is approximately three millimeters, around a brown spot you can usually see a rim of dirty red color or a greenish coating.
- Septoria - affects roses with spots of white or dark brown. Accumulation points of fungi are clearly visible on the spots.
- Sphaeloma is black or dark red small spots. Around each spot there is a red border, which gradually brightens.
- Overexposure is large brown spots. Their shape may be different, but the spots dry quickly. A distinctive feature of this type of spotting is a grayish coating on the wrong side of the rose leaf.
Measures to combat these types of spotting are almost no different from the treatment of black spots on rose leaves. Continuous testing of the bushes and preventive spraying will help protect the plants.
If you see black spots on rose leaves, do not hesitate! Otherwise, the plant can simply throw all the buds on the ground. If the fungus is launched, then the rose may die at all. Do not forget about timely watering, pruning, mulching, loosening the soil and weeding. The rose garden needs constant gentle care, only then will the flowers delight the gardener.