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Rose is a plant of unusual beauty and sophistication, which is probably why all sorts of insects and parasites love it, which cause various diseases and even death. To prevent it, it is recommended to take preventive measures. And if the bush is sick, then the correct treatment is urgently required.
- Who Causes Rose Spot Disease?
- Why do roses get sick?
- Treatment of roses for spotted diseases
Who Causes Rose Spot Disease?
Mottling on roses is caused by the fungus Marssonina rosae, Cercospora Rosicola, Septoria, Sphaceloma rosarum, Peronospora, Tobacco necrosis virus. The affected leaves of the plant are covered with ripples of different colors, depending on the type of disease. The volumes of these spots are different and with a large multiplication of the fungus, pouring completely darkens and disappears:
- The fungus Marssonina rosae causes black-brown leaf infestation in the second half of the summer season.
- Cercospora Rosicola is a fungus that creates round spots on the leaves. These spots are brown with a dark rim and bloom.
- Tobacco necrosis virus - this virus causes necrosis of some areas of the leaves, leading to darkening of the veins.
- The Septoria fungus causes the disease septoria, which is characterized by dark spots and a purple rim with pronounced fruiting bodies of the fungus.
- Sphaceloma disease (fungus Sphaceloma rosarum) is caused by small round spots with a purple border. Over time, small specks brighten and black spores are visible on them - the body of the fungus.
- Peronosporiasis is caused by a fungus from the Peronospore family. The disease is manifested by the appearance of blurry spots of a dark red color. Over time, the spots dry out, and a delicate gray coating forms under the leaf.
Important! Fungi survive the winter on the shoots, which means that next summer they will multiply again on the plant, if you do not resort to preventive measures.
Why do roses get sick?
The defeat of the plant occurs for the following reasons:
- The pruning was carried out in disagreement with all the rules, therefore, at the cut site, which was overgrown for a long time, it served as a good breeding environment.
- Watering in the evening and at night.
- Planting infected plants nearby.
- Abundant watering or lack of moisture.
- Humid climate.
- The lack of a sufficient amount of trace elements in the soil.
Treatment of roses for spotted diseases
As soon as manifestations of any disease (rosary ripple) are detected, it is necessary to immediately begin treatment. First, destroy all affected leaves and prune the plant.
Secondly, use the following solutions for spraying bushes:
- Copper-soapy. Recipe: dissolve 200 g of soap and 20 g of copper sulfate in a bucket of water.
- Bordeaux liquid (1%). Recipe: dissolve 100 g of CaO (lime) and 100 g of copper sulfate in a bucket of water.
- Topsin-M solution (2–5%). Recipe: dilute 20 g of medicine in 10 liters of water.
It is important to carry out not a one-time spraying, but a systematic one. Every 10 days for a month and a half, it is necessary to repeat the procedure, and if showers pass, then more often.
Preventive measures for spotting
All varieties of roses are conventionally divided according to the type of immunity to spotted diseases:
- Less susceptible
To make a susceptible variety less susceptible to spotting on roses, it is necessary to plant new healthy seedlings and care for them, following all the recommendations for preventing spore growth:
- Treatment of a young plant before planting. It is best to treat with biological agents (biofungicide, bactericide).
- Introduction of beneficial trace elements and bacteria into the soil (biofungicide, potassium, ash, limestone in acidic soils).
- Correct planting of bushes is an indentation of some distance between them.
- Timely removal of unhealthy and weak shoots, as well as formative pruning.
- Thinning bushes.
- Spring spraying with copper-soap solution before bud break and not lower than 100C or with chemical and biological agents.
- Top dressing in late May or early June.
- Application of funds to stimulate growth and immunity.
- Pleasant neighborhood with other varieties of flowers and plants. Lavender, sage, catnip are more suitable for a rose.
- Spraying with iron sulfate or other chemical and biological agent in front of the shelter.
- Remove all leaves and destroy them before sheltering the bush for the winter.
The fight and prevention of spotting on roses is the constancy and timeliness of actions that are aimed at destroying the fungal pathogen and preventing its reproduction with the help of solutions, processing agents and fertilizers.
Video about diseases of roses and the fight against them: