Often weakened or improperly planted plants suffer... In addition, neglect of care will inevitably lead to disease and developmental problems.
For good growth, beautiful flowering roses need constant attention from the gardener. Preventive examinations, the ability to immediately identify the first warning signs makes it possible to quickly prevent almost any ailment.
Quite often, the "queen of the flower garden" is sick because of:
- weather conditions (for example, high humidity or prolonged heat);
- poor lighting, insufficient air access;
- tightness in the rose garden;
- mechanical damage to stems, root collar.
The greatest damage is caused by infectious diseases, the causative agents of which are fungi, viruses, and bacteria. But there are also functional diseases: they appear when there is a lack of any element in the soil.
What do roses hurt?
Powdery mildew
In summer, roses often have mealy spots of a whitish-gray bloom, which later acquire a grayish-brown color. Buds and shoots die off, leaves curl. This is how powdery mildew manifests itself: its causative agent is Sphaerotheca pannosa... The fungus hibernates on stems and plant debris. The appearance of plaque is a sure sign that the flower is overfed with nitrogen fertilizers, but is deficient in potassium.
In addition, it is not recommended to carry out sprinkling irrigation in the evening: such procedures are more useful in the morning or afternoon. Bushes planted in a dense pattern, and even in a poorly lit place, are more susceptible to attacks by pathogens. Powdery mildew is easier to prevent, because then you will have to fight it for several seasons.
So what to do:
- in order to prevent the rose garden, including the ground around, is pollinated with ash, and also sprayed once a week with infusion of mullein in the usual proportion of 1:10;
- affected branches, buds are cut to a healthy place and burned. Three times every ten days, plantings, the soil are treated with Bordeaux liquid (usually 1%);
- from systemic fungicides for spraying are suitable Topaz, Skor, Vectra.
Gray rot
Fungus spores Botrytis cinerea suppress the growth point of young shoots, affect the buds and buds, which rot without even opening. On the petals, you can see characteristic brown sores, the leaves turn yellow. Damp weather encourages the development of a gray, fluffy bloom on the stems.
The fungus is activated by thickened plantings, high humidity, and also due to a lack of potassium and phosphorus in the soil. Multi-petal varieties, mainly white, cream, yellow in color, are strongly affected by gray rot.
What to do:
- a pink solution of potassium permanganate is the best prophylactic agent: it can be sprayed or watered with bushes;
- cut out infected parts and remove from the site;
- try to create the maximum possible dryness in the rose garden, feed with phosphorus and calcium 2: 1;
- effective spraying with drugs Vectra, Fundazol, iron vitriol.
Black spot
Fungus infestation Marssonina rosae occurs in late spring, and the first symptoms appear only closer to August. Brown or black spots form on the leaves, they quickly grow, growing over the surface. A weakened bush sheds foliage, blooms very poorly. Black spot begins to progress with increased humidity.
It is quite difficult to get rid of the disease, since the fungus is perfectly preserved on fallen leaves. Therefore, the intense spring pruning, cleaning up last year's plant residues and mulching are extraordinary treatments. By the way, yellow varieties are more prone to black spotting.
Control methods:
- be sure to cut off diseased leaves;
- v sunny weather the bushes are poured with a soda solution (half a glass for 3.5 liters of clean water);
- next folk way- dilute a glass of milk in 12 liters of water and give the "victim" a shower;
- processing plantings Tsinebom, Benlatom, Topaz, Skorom, Fundazol... Bordeaux liquid can also help, as can copper sulfate.
Rust
A particularly strong rust fungus of the genus Phragmidium repaired, park varieties, rose hips are amazed. In spring, bright red pustules with spores appear on the root collar, shoots, at the bottom of the leaf blade. Already in July they turn black, foliage falls off, shoots are deformed and dry up. Dealing with rust is very difficult, especially during rainy summers. If a rose is badly damaged, it cannot be treated: such specimens are destroyed.
Treatment methods:
- for prevention do foliar feeding extract of superphosphate (0.3%), potassium nitrate (0.3%);
- the affected parts must be cut out, the fallen remains must be raked up and burned. After each trimming, the tool is processed in denatured alcohol;
- planting, the ground around is sprayed with copper-containing preparations, as well as Topaz, Profit.
Viral mosaic
The characteristic signs of a viral mosaic are the appearance of yellow streaks on the leaf blades. In addition to the marble pattern, the leaves often become wrinkled, very narrow, and curly. Plants weaken, their growth slows down, they quickly die. The spread of the viral mosaic is often caused by aphids, ticks, as well as grafting roses.
The disease is easily transmitted through instruments, hands, gloves. Sick specimens are not used for reproduction. Some gardeners are in no hurry to dig out diseased bushes if they are still quite strong: they are fed with fertilizers with a full composition of trace elements. Too infested plants, of course, are destroyed.
Unfortunately, all indoor plants are susceptible to infectious diseases that cause various bacteria, mushrooms, viruses. And noncommunicable diseases, the development of which is facilitated by inappropriate conditions the environment... And although indoor roses not as capricious as some other types of plants, nevertheless, pests and diseases are not bypassed by them. Diseases of indoor roses are quite difficult to cure, so it is much easier to prevent them than to cure them. This is easy to achieve if you care for them correctly and in a timely manner.
Diseases of indoor roses
First of all, young and weakened plants are susceptible to diseases, as well as those that have not been provided with proper and attentive care. One of the most common fungal diseases indoor plants is powdery mildew. The main reasons for its occurrence can be poor ventilation of the room, overcrowding of plants in one place, as well as excess fertilization. The disease is characterized by a white bloom on the stems and leaves of the plant. With its development, the leaves gradually dry out, curl and eventually completely fall off. Treatment is carried out by removing the affected shoots, leaves and buds and treatment with topaz, foundationol, etc.Another disease similar to the previous disease is downy mildew. Very often these two diseases are confused with each other. The difference is that with downy mildew white bloom from fungal spores, as a rule, covers only the underside of leaves. On their upper side, yellowish or light spots can usually be observed. This disease spreads very quickly on wet leaves. Treatment consists in removing the affected shoots, leaves, buds and treating with a fungicide. In order for the mushrooms not to get used to a particular drug, it should be periodically replaced with another from the group of fungicides.
If weeping appear on the leaves of a room rose brown spots, gradually increasing in size, which later merge and affect the entire leaf completely, these are signs of another disease called spotting. It has both bacterial and fungal nature. Most often, the disease manifests itself in the second phase of the growing season. Treatment is carried out by removing the affected shoots and leaves and spraying with any preparations containing copper (copper sulfate, Bordeaux liquid, oxychom) or topsin and foundation. It is also important to reduce watering of affected plants and stop spraying until they are fully recovered.
If the leaves of your plants are covered with red, orange, or dark brown pads small size(pustules), they were struck by the so-called rust of roses. Insufficient and improper care of indoor roses contributes to its occurrence. It is very important to create optimal conditions for the growth and development of these plants - ventilate the room in time, avoid high temperatures air and high humidity. Treatment in this situation mainly consists in removing all suspected leaves, since spraying with fungicides may not always help to stop the development of the disease. 
Indoor rose pests
In addition to the above diseases, indoor roses can be affected by a variety of pests. The most common of these is the so-called spider mite on a room rose. The cause of its occurrence is most often insufficiently moisturized and too warm air in room. At the beginning of the defeat by this pest, pale dots can be seen on the leaves, which over time increase and turn into solid spots of whitish color. In this case, wash off the cobwebs from the plants with an anti-mite shampoo for animals and increase the humidity in the room. After that, it is necessary to treat the roses with special preparations against ticks - acaricides.There are other pests of indoor roses. These are rose aphids and thrips. They are especially dangerous in the spring summer period... Rose aphid usually infects buds and leaves, after which they curl up and become covered with sticky secretions of this pest. When affected by thrips, spots and significant deformation of the flowers can be noticed, as well as a change in the color of the leaves - they acquire a brownish-grayish tint with a silvery sheen. If these pests are found, the plants should be treated with insecticides.
It should be remembered that with correct and timely care for indoor roses, many diseases affecting these beautiful plants can be avoided. For their health, only two of the most important conditions are necessary - fresh cool air and bright diffused light.
Diseases of roses negatively affect appearance plants. They are debilitating and, in severe cases, can be fatal. In order to avoid these troubles, each owner must be able to properly protect their garden roses. In the material of the article, we will talk in detail about what types of lesions there are and how to treat roses from diseases. If the slightest signs of a pathological process are detected, treatment must be started immediately. Experienced gardeners know that it is better to spray roses special means rather than allowing the disease to spread further. Since preventive measures allow you to preserve the beauty of the plant and lengthen the flowering period.
Diseases and pests garden roses
Varieties of diseases of garden roses
Most rose diseases appear due to carelessness and non-compliance elementary rules leaving. Most of the pathological processes in plants are caused by fungi and bacteria. Thanks to modern drugs, they are easily treatable. Viral diseases are rare. Things are much worse with him. Because it is impossible to cure the queen of flowers from this serious ailment. All diseases garden shrubs can be divided into infectious and non-infectious.
Infectious disease of roses
- Powdery mildew.
Powdery mildew on roses
This disease is characterized by the appearance of a whitish coating on the surface of leaves and shoots. It usually appears at temperatures below 18 ° C and high humidity. For powdery mildew v initial stage the appearance of small spots is characteristic, which over time grow and affect the entire flower, disrupting the metabolism in it. As a result, the young shoots of the garden shrub begin to deform and die off.
Prevention of rose disease is carried out with the help of an infusion of nettle or a decoction of field horsetail, or a drug
- Rust.
Rust on roses
It develops due to infection of the terrestrial part of the plant with the Phragmidium fungus. Garden rose disease is manifested by the formation of growths yellow color... Shoots begin to twist and crack.
As a preventive measure, it is necessary to prune and thin out dry branches throughout the entire period of active growth of the plant and spray with special immunomodulators, Bordeaux liquid 1%, Topaz, Falcon preparations.
- Cortex necrosis.
Infectious burn or stem cancer of roses
This group of diseases is usually caused by fungi. In very rare cases, bacteria. It is characterized by the defeat of the cambium and cortex.
- Burn caused by infectious processes in the plant.
Roses that are in constant moisture conditions are susceptible to damage by the marsupial fungus. On the affected plant, the shoots are covered with brown, and then brown spots with a reddish edging. After that, shallow ulcers begin to form on the bark. Then, brownish growths form in their place and the affected areas dry out.
- Common cancer.
- Diplodious necrosis of the cortex.
- Tubercular dying off of the cortex.
- Diaport cancer of the stem part of the plant.
- Drying of branches (cytosporosis).
Absolutely all varieties of roses are susceptible to these diseases. All affected areas of the plant must be cut off and burned.
Preventive treatment is carried out using copper and iron sulfate.
- Gray rot.
Gray rot on roses
The disease is caused by the fungus Botrytis cinerea. The debut of the pathological process falls on winter period... Brownish depressions appear on the stems of the rose, from which a gray and fluffy mycelium then grows. Then, in its place, black growths with spores form. It is also possible the appearance of gray rot in summer time due to the large amount of rainfall. If roses are not treated for diseases, then the plant is completely covered with a gray bloom and rots.
- Root system damage caused by rot.
There are 2 diseases in which root system affected by rot: tracheomycosis and white sclerocial rot. The pathogen retains its viability in the soil for many years. The pathological process is characterized by decay of the roots, which leads to the cessation of the flow of nutrients to the plant. At first, the shoots suffer, and then the plant dies.
It is necessary to water the soil with "Fitosporin-M", "Gamair".
- Diseases caused by bacteria.
These include cancer of the roots and stem of the garden shrub. Root cancer is characterized by the formation of growths on the roots, as well as the root collar. At the beginning of the pathological process, they are soft, then they harden and eventually rot. Cancer of the stem of the plant appears as brown depressions without a border. In the affected areas of the plant, the bark dies off. After which, on the queen of flowers, dark spots.
- Diseases caused by viral pathogens.
Viral diseases of roses - viral mosaic
Downy mildew on roses
Horticultural crops are affected by viruses such as: necrosis of tobacco, striping, curly striping of tobacco, bronzing of tomato, mosaic of rezuha, mosaic of apple trees and many others. If it comes about a viral lesion, it is a mixed infection, which consists of several types. The symptoms of the pathological process are very similar to each other. For more precise definition the virus requires a number of laboratory tests. Viral diseases of roses and their treatment begin with the removal and subsequent burning of the affected areas of garden shrubs. If the rose is very strongly affected by the virus, then it is completely burned. To prevent the transmission of the disease, the entire garden tools for trimming, they are treated with alcohol or 1% potassium permanganate solution.
- Spotted lesion of the deciduous part of the plant.
- Ascochitous It is characterized by the presence of yellowish spots on the leaves, as well as a brownish growth with fungal spores.
- Purple. top part sheet. Small dark or purple spots are visible on them, bordered by a crimson stripe.
- Brown. On the upper part, the leaves are covered with dark spots, and on the lower part, they are light without borders.
- Black (marsonina). It affects the leaves, in rare cases, the shoots with a whitish bloom, which eventually become black and sticky. The leaves of the garden shrub become dark in color, and then crumble.
- Cercospora (gray). In its manifestations, it is similar to black spot. Dark spots not larger than 5 mm appear on the leaves
- Ramulariasis of plant leaves. When the disease is affected, the leaves acquire a brown color, dry out and crumble.
- Pestalocia. In the central part of the leaves of roses, the disease manifests itself with dark brown spots. The yellow stripe clearly delineates the diseased and healthy parts of the plant. It is characterized by premature leaf fall.
- Downy mildew. The causative agent of the disease is a fungus. It manifests itself with a purple and grayish bloom. The most famous and common disease.
- Septoria (septoria spot).
- Phylostictosis (phyllostic spotting).
Non-communicable diseases of garden roses
- The aging process.
- Chlorosis. It appears when there is an insufficient amount of nutrients in the soil. The leaves of the plant turn pale, yellowish streaks appear on them. Chlorosis can appear due to increased acidity of the soil, excess, as well as lack of moisture.
- Burn caused by exposure to ultraviolet radiation.
- Lack of nutrients in the soil (potassium, magnesium, iron, phosphorus, nitrogen).
- Toxic effects of fertilizers. Occurs when the amount of chemical treatment is increased. When treating a plant with pesticides, humidity and air temperature must be taken into account.
Spring processing rules
Diseases of roses after winter begin to activate, causing damage to plants. Therefore, it is very important not to miss this period and carry out preventive treatment of roses. It is during this period that the plant enters the active growth phase.
First you need to remove the winter shelter. Then conduct a thorough examination of the rose bushes for the presence of diseases and pests. There is now great amount preparations for the treatment of garden roses from the defeat of pathological pathogens. Among the large assortment, it is very difficult to choose how to spray roses in the spring from diseases.
Copper sulfate is a proven chemical preparation, which has been used for many years for the prevention and treatment of rose diseases in the spring. For this purpose, a 1% or 3% aqueous solution of copper sulfate is made. They are sprayed on the plant and the soil that is next to it.
New varieties of garden roses
Breeders from all over the world are constantly trying to develop new varieties of plants that will be less whimsical to conditions and habitat. Disease Resistant Roses mark these with the ADR sign... Of course, he cannot guarantee in any way that everything will be fine with this particular type of garden shrub. But the quality mark is awarded only to those varieties that have the best characteristics.
Most of the garden shrubs marked with this quality mark are quite rare, and some are well known in many countries around the world. Among them you can find: densely double, non-double, ground cover and flower beds.
The most resistant varieties include the following types of garden roses:
- non-double "Escimo",
- bud cover "Crimson Meidiland",
- floribundas "Cherry Girl", "Novalis",
- climbing "Apricola" and many others
Subject to the simple rules of care and correct feeding plants can avoid the appearance of diseases of garden roses. If you see the first signs of illness, take action immediately. This approach will allow not only to quickly heal your flower, but also to protect the entire garden from infection with pathogens. There are now many varieties of garden roses that are disease resistant. But this does not mean that the flowers will not need care.
Diseases in roses are infectious and non-infectious. Also, plants are attacked by sucking and gnawing pests. Preventive measures play a positive role. A lot depends on how you will be.
Preventive measures play a major role in protecting plants from disease and damage. First of all, this is pruning of damaged parts, regular spraying with appropriate preparations, infusions.
Throughout their development, roses are at risk of contracting many diseases. Therefore, today we will take a closer look at the frequently encountered ones in order to know what to do, how to treat, and what protective measures to take.
Diseases of roses - what are they and how to treat them
Now we will consider infectious diseases, especially relevant ones, which weaken the plant. They arise under the influence of organisms that come into contact with the plant and disrupt all physiological processes in it with their vital activity. By invading the metabolism, as a result, they lead the plant to death.
The causative agents of infections are all kinds of pathogenic fungi, bacteria, viruses and other harmful microorganisms.
1. Infectious burn- it strikes roses after taking shelter off in springtime. Look closely at the shoots and you will see a bright red ring, which then turns black and, as a result, the shoot dies.
Varieties of many plants are exposed to this disease. Especially when there is high humidity and a lot of nitrogen in the soil. Damage to the bark by frost contributes to the development of the disease.
Control measures. Trim the shoot below the ring to the level of healthy wood. But if the ring is not closed, then you can scrape off the damaged bark and smear it with RanNet.
2. Spotting: black, phyllostictic, septoria. As a rule, they appear in the middle of summer when the first leaves are blooming. You can see spots of different colors and shapes, because of this, the leaves turn yellow and fall off. And also, high humidity air contributes to the development of spotting.
Control measures. In the spring, when the plants open up, you need to sprinkle them with phytosporin in a therapeutic dose (7 ml per 1 liter of water). In the month of May, repeat the treatment again, but with a lower dose (3.5 ml per 1 liter of water).
And in addition, in the month of May, after the onset of the temperature above 12 degrees C, you need to sprinkle them with Gamair (1 tablet per 10 liters of water). After another week, sprinkle with Alirin (1 tablet per 10 liters of water).
All the same must be repeated in the month of June and July. Here is such a not at all complicated care of our beauties.
If the infection does occur, then collect all the leaves, and treat the plant and the ground around with copper-containing preparations or Fitosporin.
3. Powdery mildew- appears from sharp fluctuations in day and night air temperatures, as well as with excessive fertilizing with nitrogen and with a deficiency of potassium.
Leaves, young shoots and buds get sick. First of all, a white bloom appears, and then gray spots.
Later, the leaves curl up, but the buds do not open.
Control measures. Be sure to cut out affected shoots and remove diseased leaves for burning in a fire. Sometimes it is useful to treat the bushes with a copper-soapy solution.
But some gardeners do the treatment with mullein infusion (1:10), or a five-day infusion of ash (1 glass per 10 liters of water) or nettle infusion.
4. Gray rot (or botrytis). The causative agent is the fungus Botrytis cinerea. The plant mainly affects the buds with pedicels, as well as the ends of young stems and leaves. This happens more often in damp weather, when the plant is covered with a gray fluffy bloom.
As a result of the disease, the buds do not open, rot and fall off.
The leaves turn yellow and also fall off.
Prevention. In the month of May, to heal the soil and from root rot, put a Glyocladin tablet under each bush. Then put it down in the month of August.
Basically, you need to loosen the soil, apply fertilizers and mulch.
5. Cancer of the stems. As a result of such a disease, tubercles grow on the stems and are clearly visible.
Prevention. Sprinkle the plants before blooming copper sulfate(5%). And yet, there is no need to allow unnecessary and late application of nitrogen fertilizers.
Control measures. In order to avoid disease, infected places are cut out to healthy wood.
6. Rust. Orange tubercles first appear on the leaves,
then they spread and color the leaves, especially a lot, on the back.
Control measures. Treat the leaves from the underside with copper-containing preparations, alternate the treatment every three weeks.
Video about what diseases roses can be infected with
See what virus-infected plant leaves look like and what you need to do to protect them.
Most often, problems arise with thickened plantings and, most likely, from evening watering, when the leaves of the plant do not have time to dry before nightfall.
Non-communicable diseases of the rose
Under unfavorable air conditions, such as frost, rain or drought, non-communicable plant diseases occur. These are the stressful growing conditions that lead to metabolic disorders.
Plants with their roots cannot take the necessary nutrients... As a result, their lack leads to the appearance of various painful symptoms.
First of all, there is a lack of nitrogen, phosphorus and magnesium. This phenomenon manifests itself first on the lower leaves, then spreads up the plant.
The same, but only the other way around, manifests itself with a lack of calcium, copper and boron. Then diseases go from top to bottom, from younger stems to older parts of the plant.
These phenomena resemble those caused by fungi, bacteria, or viruses. It is time for us gardeners to work our brains and experience difficulties in making a diagnosis. That also happens.
Video on how to properly care for roses
Learn 6 rules of caring for plants so that all diseases recede and do not torment our favorite flowers.
Keep in mind that if you have planted a rose. then in the first year it needs to be watered after 2 weeks, at least. she loves water very much.
Rose pests are the most common
Common pests for this beautiful plant are as follows: aphids,
leaf rollers,
rose-colored sawfly, caterpillars,
rose leafhoppers.
For pests on your beauties of roses, you need to carefully monitor and prevent their spread. Use protective plants to keep pests away. They are called insecticidal plants. These include: marigolds, nasturtium, they will scare off nematodes and thrips.
More details about protecting roses with different preparations and infusions in the next article.
The queen of flowers, the rose, is undoubtedly the beauty of any flower bed. The variety of varieties of roses today provides an opportunity to create wonderful compositions with these flowers. They are planted in separate rose gardens or among other flowers, in any case they are very beautiful. But this beauty requires considerable sacrifices. The very procedure for breeding roses is quite difficult. This flower is demanding, delicate, it must be protected from external environment... Unfortunately, roses do not only suffer from bad weather or pests. Quite often they get sick. What diseases of roses exist, how to deal with them, or how to prevent them altogether? This is what will be discussed in our article.
Description of diseases with photos and videos
Rust is a disease of early spring
It is in those years when spring is warm and rainy that roses most often suffer from rust. The problem manifests itself even during the period when the plants are blooming. Spores appear as a dusty orange mass. It can be observed near the leaves, also in the area of the root collar.
In the summer, the disease is visible on the back of the leaves. There are peculiar red-colored pads. The appearance of these sporulation negatively affects the plant as a whole. Its functions and abilities are impaired: photosynthesis, metabolism. When the disease develops, the plant loses its decorative view... Leaves, flowers and buds begin to be depressed and deformed.
How to prevent
It is important to follow three main rules. First, it is necessary to thin out the bushes, removing dried branches, flowers, every year at the end of summer. Secondly, with the onset of autumn, it is important to process plants with Bordeaux liquid or copper sulfate (3%). And thirdly, roses must be sprayed according to the instructions. chemicals stimulating plant immunity. Suitable, for example, "Zircon", "Immunocytophyte", etc.
How to fix
The fight against this disease includes the following measures:
- Affected shoots must be cut off;
- The leaves are collected and necessarily burned;
- They dig up the soil;
- Copper-soap treatment during vegetation.
Folk remedies
You can try to remove rust with this remedy. Mixes 1 tbsp. l. soda, 1 tsp. means for washing dishes, 1 tbsp. l. vegetable oil, as well as 1 gallon of water and 1 tablet of aspirin dissolved in water. The mixture of these ingredients should be sprayed on the plants once every about 1-2 weeks.
Rust is the worst disease of roses: video
Black spot - summer rain disease
Most of all, this problem spreads in those regions where there is frequent precipitation in the second half of the summer. At first, only small dark spots appear. Until the end of July, they can already become large, sporulation is formed on them. Then the leaves begin to fall off, first the top ones, and then all the way down. When the disease is very widespread, the leaves darken completely. They begin to dry, and then disappear altogether.
Spores and mycelium of this pathogen tolerate winter well, being on the leaves and shoots of the plant.
How to prevent
Every autumn, it is necessary to spray all the bushes with 3% copper sulfate. This procedure must be performed before the shelter for the winter. The prevention system includes the same measures that are taken to fight the disease.
Control measures
They include the destruction of all diseased parts of the plant. The leaves are harvested and burned, just like the shoots. Digging also needs to be done, preferably with a turnover of the formation. From finished preparations suitable for processing "Kaptan", "Fundazol", "Topaz", "Skor".
How the people fight
It should be noted right away that to cure a rose from black spot with the help of one folk remedies will most likely fail. This has long been tested by many gardeners. But for prevention, they are great.
You can spray the plant with a solution of water and iodine. The latter needs to be taken 1 ml, which is enough for 400 ml of liquid. Another way is to water the mullein solution. It is diluted about 1 in 10, after which it is left to infuse for several days. Such watering is allowed during the period from the removal of the winter shelter and before the buds bloom.
You can process the whole plant with a decoction of garlic and onion husks. Approximately 30-40 g of this waste is poured with water and boiled. After that, the solution should be infused for at least 6 hours.
Black spot is the scourge of all gardeners: video
This disease is familiar to all gardeners and gardeners. The fact is that it affects not only flowers, but also very a large number of diverse cultures.
Already from the name itself, one can understand that the external symptom of this disease is the presence of a substance that resembles a powder. Its color can be gray, white. Almost the entire upper part of the plant is affected by this disease.
Preventive measures
They include several basic tasks:
- Do not allow rose bushes to thicken. It is very important to thin out the plants.
- It is necessary to apply nitrogenous fertilizers strictly according to the calendar. If you oversaturate the soil with them, especially after mid-summer, it will lead to illness.
- It is necessary to use fungicides even during the formation of flower buds. For this, the following drugs are suitable: "Fundazol", "Baylon", etc.
- It is necessary to add potassium sulfate at the beginning of the second half of summer.
How to overcome
The simplest, but most important, activities will be useful - pruning all the shoots that are affected by the disease, as well as collecting leaves and destroying them in a fire. The soil is dug up only with the seam turnover. So the pathogens will suffer from lack of air and may die. During the period of awakening or falling asleep, the bush is treated with copper sulfate or potassium sulfate with copper sulfate. Spraying is carried out with such means as colloidal sulfur (1% suspension), or soda ash(for 10 l of water 50 g of substance).
Traditional methods
There are many ways to deal with this problem as it is so common. One proven method is zonal grout. It is prepared from 1 kg of sifted ash and 10 liters of water. The liquid should be warm. It is necessary to insist the agent for at least 3 days, stirring every 20-25 hours.
Peronosporosis - a disease of bad weather
Experts note that hybrid tea varieties of rose bushes most often suffer from this disease. Plants usually suffer, which are located in the shade, while with poor air ventilation around. As a rule, the problem manifests itself during a period when the humidity is high and the temperature drops sharply.
The symptoms of the disease are as follows. At first, spots of an incomprehensible shape appear. They are purple or red in color. When the disease develops, the leaves wither, weaken. Then they curl up and, in the end, just die. The stems suffer from cracks, the buds also begin to die and darken.
If you look at the leaf through a magnifying glass, you can see a cobweb plaque on the reverse side.
How to prevent
Downy mildew or downy mildew can be prevented. It is necessary to regularly remove weeds, as well as destroy fallen leaves. This also applies to shoots, whole plants that have suffered.
Digging with the seam turnover is required every autumn. TO nitrogen fertilizers must be treated with caution, using them in moderation. It is necessary to carefully monitor the soil, ventilation and temperature regime... It is important to ensure that no water gets on the leaves while watering.
How to eliminate the disease among the people
For a long time, the bushes were treated against downy mildew with decoctions of horsetail, garlic husks, solutions of ash, iodine and milk. The last remedy is prepared as follows: 1 liter of milk (skim) and no more than 10 drops of iodine (5%) are added to 9 liters of water.
Horsetail decoction is prepared as follows. It is necessary to prepare 1 kg of fresh plant or 150 g of dried one. At night, the raw materials must be soaked in 10 liters of water. After that, the infusion should boil and cook for about 30 minutes. After cooling, the substance must be filtered and diluted in a ratio of 1 to 5.
Anthracnose - a cold spring problem
Although this disease is quite common, it is not yet fully understood. The first symptoms are small dark spots. They can be confusing and can be confused with black spot. But over time, the spots change. They turn red, purple, or brown. Their center is usually lighter, sometimes a hole forms in it.
Prevention
A mandatory event is pruning. All affected areas, including stems, leaves, are subject to it. Then all the waste must be burned, which will help prevent the spread of the fungus.
Every autumn it is necessary to clean the bushes and the area around them. This will prevent re-infection.
How to fix the problem
When traces of anthracnose have already been noticed on the rose bushes, it is urgent to apply microbiological preparations. Gamair or Fitosporin-M are perfect. In the fall, you can treat rose bushes with such drugs as "Ridomil", "Fundazol", etc. It is advisable to alternate them, otherwise the plants become addictive.
Infectious burn - the problem of injured flowers
A rose bush can become infected with this disease during a dormant period - in autumn or spring. For example, if there is no proper care, then the spores of the fungus enter the stems through cracks that have appeared due to severe frosts... Another way of infection is wounds, which are formed by improper cutting or processing after it. Weather conditions also contribute to infection - no wind, too high humidity. Also, late fertilization with nitrogenous substances can lead to a deterioration in the condition.
This disease is also called stem cancer. It manifests itself in the form of dark ulcers on the stems, which lead to the death of the shoots. Over time, blackheads can also be noticed on the ulcers, which help the disease spread.
Prevention of an infectious burn
- First, in no case should the plants be allowed to freeze. This provokes the appearance of cracks through which infection occurs.
- Secondly, the shelter must be carried out in a timely manner and in the right conditions... The temperature should not exceed 10 0 С, and the humidity should be moderate.
- It is important to treat the soil before covering with special means: Bordeaux liquid (1%) or copper sulfate (3%).
- It is very important to disinfect the tools before pruning roses.
- Spray potash fertilizers from the beginning of the second half of summer.
How to treat
All shoots that are already damaged by the disease must be removed. But in this case, it is important not to damage the ulcers. Small wounds need to be cleaned sharp knife for example, for paper, to healthy flesh. Then they are smeared garden pitch... Sick bushes must be treated with the HOM fungicide every week.
Infectious burn after winter on roses: video
The problem arises under conditions such as too dense planting, cold air and high humidity, and improper use of nitrogenous fertilizers. The main symptom of this disease is gray spots. They can be seen on all parts of the bush: leaves, flowers, stems and even buds. With the development of the disease, these spots turn yellow, rotten areas appear, they begin to die off.
How to carry out prevention
Precautions include constant loosening of the soil. Mulching is also important. It is also necessary to apply those fertilizers that prevent the reproduction of fungi. These include manganese-containing preparations. They enhance oxidative processes inside the plant.
Treatment
It depends on the stage of development of the disease. If it is just beginning, then the following steps must be taken:
- All diseased parts, shoots must be destroyed;
- Plants need to provide dry living conditions.
If the plant has already been badly damaged, then you cannot do without special substances. It is necessary to spray roses with a solution of "Fundazol" (0.2%). There is one more measure - the most extreme one. Every two weeks, the bushes need to be sprayed with Bordeaux liquid (1%).
Folk ways
This disease is often difficult to overcome with light decoctions or infusions. But like others fungal diseases, gray rot you can try to prevent or eliminate it with horsetail decoction.
Gray and root rot: video
Rose is a thorny plant, but very delicate. It is susceptible to various diseases, but because of this, you should not abandon the cultivation of this crop. You just need to know what and how to do to overcome the disease. Then there will be incomparable, beautiful flower queens in your garden.