More often weakened or improperly planted plants suffer. In addition, neglect of care will inevitably lead to the occurrence of diseases and developmental problems.
For good growth, beautiful flowering roses need constant attention from the gardener. Preventive checkups, the ability to immediately identify the first alarming signs make it possible to quickly prevent almost any ailment.
Quite often, the "queen of the flower garden" is sick due to:
- weather conditions (for example, high humidity or prolonged heat);
- poor lighting, insufficient air supply;
- tightness in the rose garden;
- mechanical damage to stems, root neck.
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 is wrong with roses?
powdery mildew
In summer, powdery spots of a whitish-gray bloom are often found on roses, 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 overwinters on stems and plant debris. The appearance of plaque is a sure sign that the flower is overfed with nitrogen fertilizers, but it 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 attack by pathogens. Powdery mildew is easier to prevent, because then you have to fight it for several seasons.
So what to do:
- for the purpose of prevention, the rose garden, including the ground around, is pollinated with ash, and also sprayed once a week with mullein infusion in the usual proportion of 1:10;
- affected branches, buds are cut to a healthy place and burned. Three times every ten days, plantings and soil are treated with Bordeaux liquid (usually 1%);
- of 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. Wet weather promotes the development of a gray fluffy coating on the stems.
The fungus is activated with dense plantings, high humidity, and also due to a lack of potassium and phosphorus in the soil. Gray rot strongly affects multi-petal varieties, mainly white, cream, yellow.
What to do:
- a pink solution of potassium permanganate is the best preventive measure: you can spray or water the bushes with it;
- 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 infection 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 increase, growing over the surface. A weakened bush sheds foliage, blooms very poorly. Black spot begins to progress with high humidity.
It is quite difficult to get rid of the disease, since the fungus is perfectly preserved on fallen leaves. Therefore, intensive spring pruning, cleaning last year's plant residues and mulching are extraordinary methods of treatment. By the way, yellow varieties are more prone to black spotting.
Fighting methods:
- be sure to cut off diseased leaves;
- in sunny weather the bushes are poured with soda solution (half a glass of 3.5 liters of clean water);
- next folk way- dilute a glass of milk in 12 liters of water and give the "injured" a shower;
- planting processing Tsineb, Benlat, Topaz, Fast, Fundazol. Bordeaux liquid can also help, as well as copper sulfate.
Rust
A particularly strong rust fungus of the genus Phragmidium remontant, park varieties, wild roses are affected. In spring, bright red pustules with spores appear on the root neck, shoots, at the bottom of the leaf blade. Since July, they turn black, the foliage falls off, the shoots are deformed and dry. Rust is very difficult to deal with, especially in rainy summers. If the rose is badly damaged, it cannot be treated: such specimens are destroyed.
Treatment methods:
- do for prevention foliar top dressing extract of superphosphate (0.3%), potassium nitrate (0.3%);
- the affected parts must be cut out, the fallen residues raked up and burned. After each trimming, the tool is processed in denatured alcohol;
- plantings, 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, curly. Plants weaken, their growth slows down, they quickly die. Aphids, mites, and rose grafting are often the cause of the spread of viral mosaics.
The disease is easily transmitted through tools, hands, gloves. Sick specimens are not used for reproduction. Some gardeners are in no hurry to dig up diseased bushes, if they are still quite strong: they are fed with fertilizers with a full composition of trace elements. Plants that are too affected are, of course, destroyed.
Unfortunately, all indoor plants are susceptible to infectious diseases that cause various bacteria, mushrooms, viruses. And non-communicable diseases that are promoted by unsuitable conditions environment. And although indoor roses not as capricious as some other types of plants, yet pests and diseases do not bypass them. Diseases of indoor roses are quite difficult to cure, so it is much easier to prevent them than to treat them. This is easy to achieve if you properly and timely care for them.
Diseases of indoor roses
First of all, young and weakened plants, as well as those that have not been provided with proper and attentive care, are susceptible to diseases. 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, crowding of plants in one place, as well as excessive fertilizer. The disease is characterized by a white coating 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 treating them with topaz, fundazol, etc.Another disease similar to the previous one is downy mildew. Very often these two diseases are confused with each other. The difference is that with downy mildew white coating of fungal spores covers, as a rule, only the underside of the 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 fungi not to get used to a particular drug, it should be periodically replaced with another from the group of fungicides.
If wet leaves appear on the leaves of a room rose brown spots, gradually increasing in size, which later merge and affect the entire leaf completely, then these are signs of another disease called spotting. It is both bacterial and fungal in 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 foundationol. It is also important to reduce watering of affected plants and stop spraying them 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 rose rust. Its occurrence is facilitated by insufficient and improper care of indoor roses. 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 is mainly to remove all suspicious leaves, since spraying with fungicides can not always stop the development of the disease. 
Pests of indoor roses
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 hydrated and too warm air in room. At the beginning of the defeat by this pest, pale dots can be seen on the leaves, which eventually increase and turn into solid whitish spots. In this case, wash the cobwebs from the plants with a tick 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. Rosan aphid usually infects buds and leaves, after which they curl up and become covered with sticky secretions of this pest. When affected by thrips, you can notice spots and significant deformation of the flowers, as well as a change in the color of the leaves - they acquire a brownish-grayish hue with a silvery sheen. If these pests are found, the plants should be treated with insecticides.
It should be remembered that with the right timely care behind indoor roses, many diseases that affect 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.
Rose diseases have a negative effect on 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 are and how to treat roses from diseases. If the slightest signs of a pathological process are detected, treatment should be started immediately. Experienced gardeners know better to spray roses by special means than to allow further spread of the disease. Since preventive measures can 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 inattention and non-compliance elementary rules care. Most pathological processes in plants are caused by fungi and bacteria. Thanks to modern drugs, they are easily treatable. Viral infections are rare. Things are much worse for him. Since it is impossible to cure the queen of flowers from this serious illness. All diseases garden shrubs can be divided into infectious and non-infectious.
Infectious diseases 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 18ºC and high humidity. For powdery mildew in initial stage the appearance of small spots is characteristic, which eventually grow and affect the entire flower, disrupting its metabolism. As a result, the young shoots begin to deform in the garden shrub and die off.
Prevention of rose disease is carried out with the help of nettle infusion or a decoction of horsetail, or a preparation
- Rust.
Rust on roses
It develops due to infection of the ground part of the plant with the fungus Phragmidium. The disease of garden roses 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 plant growth and spray with special immunomodulators, Bordeaux liquid 1%, Topaz, Falcon preparations.
- Necrosis of the cortex.
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 damage to the cambium and cortex.
- A burn caused by infectious processes in a plant.
Roses that are in conditions of constant moisture are susceptible to the defeat of marsupial fungus. On the affected plant, the shoots become 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.
- Ordinary cancer.
- Diplodia necrosis of the cortex.
- Tubercular death of the bark.
- 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 and burned.
Preventive treatment is carried out using copper and iron sulfate.
- Gray rot.
gray mold on roses
The disease is caused by the fungus Botrytis cinerea. The debut of the pathological process falls on winter period. Brownish impressions 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 high rainfall. If roses are not treated for diseases, then the plant becomes covered with a completely gray coating and rots.
- Damage to the root system 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 root rot, which leads to a cessation of the supply of nutrients to the plant. First, the shoots suffer, and then the plant dies.
It is necessary to water the soil "Fitosporin-M", "Gamair".
- Diseases caused by bacteria.
These include cancer of the roots and stem parts of garden shrubs. 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 harden and eventually rot. Cancer of the stem part of the plant appears as brown depressions without a border. On the affected areas of the plant, the bark dies off. After which on the queen of flowers are formed dark spots.
- Diseases caused by viral pathogens.
Viral diseases of roses - viral mosaic
Downy mildew on roses
Horticultural culture is affected by such viruses as: tobacco necrosis, streak, tobacco curl streak, tomato bronze, rezuhi mosaic, apple tree mosaic and many others. If we are talking about viral damage, then this is a mixed infection, which consists of several types. Symptoms of the pathological process are very similar to each other. For more exact definition virus requires a series 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, all garden tools for trimming, treat 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. They show small dark or purple spots, bordered by a crimson stripe.
- Brown. On the upper part of 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 coating, which eventually become black and sticky. The leaves of the garden shrub become dark in color, and then crumble.
- Cercosporosis (gray). In its manifestations, it is similar to black spot. Dark spots no larger than 5 mm appear on the leaves.
- Ramularia of the leaves of the plant. When the disease is affected, the leaves become brown in color, dry out and crumble.
- Pestalotia. In the central part of the leaves of roses, the disease manifests itself as dark brown spots. The yellow stripe clearly distinguishes between the diseased and healthy part of the plant. It is characterized by premature leaf fall.
- Downy mildew. The causative agent of the disease is a fungus. It appears purple and grayish bloom. The most famous and widespread disease.
- Septoria (septoria spotting).
- Phyllostictosis (phyllostic spotting).
Non-infectious diseases of garden roses
- The process of aging.
- Chlorosis. Appears with insufficient amounts of nutrients in the soil. The leaves of the plant turn pale, yellowish veins 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).
- The toxic effect of fertilizers. Occurs with an increase in the amount of treatment with chemical solutions. When treating a plant with pesticides, it is necessary to take into account the humidity and air temperature.
Rules for spring processing of plants
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 phase of growth.
First you need to remove the winter shelter. Then conduct a thorough inspection of rose bushes for the presence of diseases and pests. Now exists 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 drug, 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 sulphate is made. They carry out spraying of 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 the 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 variety 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 of 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-terry "Escimo",
- kidney cover "Crimson Meidiland",
- floribundas "Cherry Girl", "Novalis",
- climbing "Apricola" and many others
Subject to simple rules of care and proper 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 not only quickly heal your flower, but also protect the entire garden from infection by pathogens. Now there are 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. Plants are also 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 trimming of damaged parts, regular spraying with appropriate preparations, infusions.
Throughout their development, roses are in danger of contracting many diseases. Therefore, today we will consider in detail the most common ones in order to know what to do, how to treat and what protective measures to take.
Diseases of roses - what are and how to treat them
Now let's look at infectious diseases that are especially relevant, which weaken the plant. They arise under the influence of organisms that are in contact with the plant and disrupt all the physiological processes in it with their vital activity. 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 infects roses after removing the shelter in the spring. Look carefully 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 affected by this disease. Especially when observed high humidity and plenty of nitrogen in the soil. The development of the disease is promoted by damage to the bark by frost.
Control measures. Cut 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 spread it with RanNet.
2. Spotting: black, phyllostic, septoria. As a rule, they appear in the middle of summer when the first leaves open. 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 at a therapeutic dose (7 ml per 1 liter of water). In May, repeat the treatment again, but with a lower dose (3.5 ml per 1 liter of water).
And additionally, in the month of May, after the temperature rises 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 difficult care for our beauties.
If infection nevertheless occurs, 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 coating appears, and then gray spots.
Later, the leaves curl and 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-soap solution.
But some gardeners do the treatment with mullein infusion (1:10), or a five-day infusion of ash (1 cup per 10 liters of water) or nettle infusion.
4. Gray rot (or botrytis). The causative agent is the fungus Botrytis cinerea. The plant suffers mainly buds with pedicels, as well as the ends of young stems and leaves. This happens more often in wet weather, when the plant is covered with a gray fluffy coating.
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 improve the soil and from root rot, put a tablet of Gliocladin under each bush. Then put it in the month of August.
Basically, you need to loosen the soil, fertilize and mulch.
5. Cancer of the stems. As a result of such a disease, tubercles grow on the stems and are clearly visible.
Prevention. Spray plants before leafing out. blue vitriol(five%). And yet, you do not 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 stain the leaves, especially a lot, on the reverse side.
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 needs to be done to protect them.
More often problems arise with dense plantings and, most likely, from evening watering, when the leaves of the plant do not have time to dry out before night.
Non-infectious diseases of the rose
Under unfavorable air conditions, such as frost, rain or drought, non-infectious plant diseases occur. These stressful growing conditions lead to metabolic disorders.
Plants with their roots cannot take from the soil the necessary nutrients. As a result, their deficiency leads to the appearance of various painful symptoms.
First of all, a lack of nitrogen, phosphorus and magnesium begins. This phenomenon appears first on the lower leaves, then spreads up the plant.
The same thing, but only the other way around, manifests itself with a lack of calcium, copper and boron. Then the diseases go from top to bottom, from the younger stems to the older parts of the plant.
Such phenomena resemble symptoms caused by fungi, bacteria or viruses. It's time for us gardeners to use our brains and struggle to make a diagnosis. That also happens.
Video on how to properly care for roses
Learn 6 rules for caring for plants so that all diseases recede and our favorite flowers do not torment.
Keep in mind that if you planted a rose. then in the first year it needs to be watered every 2 weeks, at least. she loves water very much.
Rose pests are the most common
Common pests for this beautiful plant are: aphids,
leaflets,
rose sawfly, caterpillars,
rosy cicadas.
Pests on their beautiful roses need to be carefully monitored and prevented from spreading. Use plant protectors to keep pests at bay. They are called insecticidal plants. These include: marigolds, nasturtium, they will scare away the nematode and thrips.
More details about the protection of roses with the help of various preparations and infusions in the next article.
The queen of flowers, the rose, is undoubtedly the beauty of any flower bed. A variety of varieties of roses today provides an opportunity to create beautiful 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 sacrifice. The procedure for breeding roses is quite difficult. This flower is demanding, delicate, it must be protected from external environment. Unfortunately, roses suffer not only 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 at all? This 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 bloom. The spores appear as a dusty orange mass. It can be observed near the leaves, also in the region of the root neck.
In summer, the disease is visible on the back of the leaves. There are peculiar red-colored pads. The appearance of these sporulations negatively affects the whole plant. Its functions and abilities are violated: photosynthesis, metabolism. As the disease develops, the plant loses its decorative look. Leaves, flowers and buds begin to be oppressed, deformed.
How to prevent
It is important to follow three main rules. Firstly, it is necessary to thin out the bushes, removing dried branches, flowers, every year during the end of summer. Secondly, with the onset of autumn, it is important to treat the plants with Bordeaux mixture or copper sulphate (3%). And thirdly, roses need to be sprayed according to the instructions. chemicals that stimulate plant immunity. Suitable, for example, "Zircon", "Immunocytophyte", etc.
How to eliminate
The fight against this disease includes the following measures:
- Affected shoots must be cut;
- The leaves are collected and necessarily burned;
- The soil is dug up;
- Processing with a copper-soap solution during the growing season.
Folk remedies
You can try to remove rust with this tool. Mixed 1 tbsp. l. soda, 1 tsp. means for washing dishes, 1 tbsp. l. vegetable oil, as well as 1 gallon of water and 1 aspirin tablet dissolved in water. Plants should be sprayed with a mixture of these ingredients once every about 1-2 weeks.
Rust is the most terrible disease of roses: video
Black spot - a disease of summer rains
Most of all, this problem spreads in those regions where frequent precipitation is observed in the second half of summer. At first, only small dark spots appear. Until the end of July, they can already become large, sporulation is formed on them. Further, the leaves begin to fall off, first the upper ones, and then lower and lower. When the disease spreads strongly, the leaves darken completely. They begin to dry up, and then completely disappear.
The 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 copper sulfate 3%. This procedure must be performed before shelter for the winter. The prevention system includes the same measures that are taken to combat the disease.
Control measures
They include the destruction of all diseased parts of the plant. The leaves are collected and burned, as are the shoots. Digging also needs to be done, preferably with a reservoir turnover. From finished products suitable for processing "Kaptan", "Fundazol", "Topaz", "Skor".
How people fight
It should be noted right away that to cure a rose from black spotting with the help of only folk remedies most likely won't work. This has long been verified 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 with a solution of mullein. It is diluted approximately 1 to 10, after which it is left to infuse for several days. Such watering is allowed in the period from the removal of winter shelter and before the buds open.
You can process the whole plant with a decoction of garlic and onion husks. Approximately 30-40 g of these wastes are poured with water and boiled. After that, the solution should be infused for at least 6 hours.
Black spot - 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, it can be understood that the external sign 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 main tasks:
- Rose bushes should not be allowed to thicken. It is very important to thin out the plants.
- It is necessary to apply nitrogenous fertilizers strictly according to the calendar. If the soil is oversaturated with them, especially after midsummer, this will lead to disease.
- It is necessary to use fungicides even during the formation of flower buds. Such drugs are suitable for this: Fundazol, Bayleton, etc.
- It is necessary to make potassium sulfate with the beginning of the second half of summer.
How to overcome
The simplest, but most important, activities will be useful - pruning all 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 turnover of the reservoir. So the pathogens will suffer from a lack of air and may die. During the period of awakening the bush or falling asleep, it is treated with copper sulphate or potassium sulfate with copper sulphate. Spraying is also carried out with such means as colloidal sulfur (1% suspension), or soda ash(for 10 liters of water 50 g of the substance).
Folk methods
There are many ways to deal with this problem as it is very common. One of the proven methods is the zonal solution. 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 that are located in the shade usually suffer, while with poor ventilation around the air. As a rule, the problem manifests itself during a period when the humidity is high and the temperature drops sharply.
These are the symptoms of the disease. Initially, spots of an incomprehensible shape appear. They are purple or red. When the disease develops, the leaves wither, weaken. Then they curl up and eventually just die. The stems suffer from cracks, the buds also begin to die and darken.
If you look at the sheet through a magnifying glass, then on the reverse side you can see a raid in the form of a web.
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 a turnover of the reservoir every autumn is required. TO nitrogen fertilizers should be treated with caution and used sparingly. It is necessary to carefully monitor the soil, ventilation and temperature regime. It is important to ensure that water does not fall on the leaves during watering.
How to eliminate the disease in the people
Bushes have long been 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 (skimmed) and no more than 10 drops of iodine (5%) are added to 9 liters of water.
A decoction of horsetail is prepared as follows. It is necessary to prepare 1 kg of a fresh plant or 150 g of a 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, the problem 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
Mandatory event - pruning. All affected areas, including stems, leaves, are subject to it. Then all waste must be burned, which will help to avoid 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 are already noticed on rose bushes, it is urgent to apply microbiological preparations. Gamair or Fitosporin-M are excellent. In autumn, you can treat rose bushes with such preparations as Ridomil, Fundazol, etc. It is advisable to alternate them, otherwise the plants become addictive.
Infectious burn - the problem of wounded flowers
A rose bush can become infected with this disease during the 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 that are formed during improper pruning or processing after it. Weather conditions also contribute to infection - lack of 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 cankers on the stems, which lead to the death of the shoots. Over time, black dots can also be seen on the ulcers, which help the disease to spread.
Prevention of infectious burn
- First, in no case should plants be allowed to freeze. This provokes the appearance of cracks through which infection occurs.
- Secondly, shelter must be carried out in a timely manner and in right conditions. The temperature should not exceed 10 0 C, and the humidity should be moderate.
- It is important to treat the soil before shelter with special means: Bordeaux liquid (1%) or copper sulfate (3%).
- Every time before pruning roses, it is very important to disinfect the tools.
- Carry out spraying 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 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 smothered garden pitch. Every week, diseased bushes must be treated with the HOM fungicide.
Infectious burn after winter on roses: video
There is a problem in conditions such as too dense planting, cold air and high humidity, as well as 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.
How to carry out prevention
Precautions include constantly loosening the soil. It is also important to mulch. 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 what stage of development the disease is at. If it is just starting, then you need to take the following steps:
- All diseased parts, shoots must be destroyed;
- Plants need to provide dry living conditions.
If the plant has already been badly damaged, then special substances cannot be dispensed with. It is necessary to spray roses with a solution of "Fundazol" (0.2%). There is another measure - the most extreme. Every two weeks, the bushes should 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 with a decoction of horsetail.
Gray and root rot: video
A rose is a plant, though prickly, but very tender. It lends itself to various diseases, but you should not refuse to grow this crop because of this. You just need to know what and how to do to overcome the disease. Then in your garden there will be incomparable, beautiful queens of flowers.