General information

Diseases of phlox with photos and their treatment


Florists do not pass by phlox indifferently. Flowers fill the garden with a light scent, burn with a bright flame, attract views through the shimmering shades of petals and inflorescences. It is customary to attribute these flowers to unpretentious plants. But experienced growers know that often there are unpleasant diseases of phlox, the treatment of which does not always lead to a positive result.

There are several varieties of phlox. It is subulate, splayed, paniculate. Given the varietal characteristics, phlox can be planted so that flowering lasts all summer. A variety of colors and the breeding of bright hybrids forces flower growers to acquire new varieties.

But if you do not recognize phlox disease in time, leave the focus of the disease unattended, the florist risks losing a whole collection of beautiful flowers.

Diseases of phlox flowers are transferred to a clean garden with the arrival of a new instance. Externally, a healthy plant can wear spore fungi, infect a number of growing flowers and gradually, instead of beautiful strong bushes, remain drained from below, with dark spots on the leaves and poorly flowering buds of the plant. Viruses and fungi cause terrible phlox disease. Treatment for them to be long, not always effective.

Weather conditions (humidity, cold dew), thick planting of plants, carelessness of the gardener and delayed prevention lead to the multiplication of fungal diseases.

There are plenty of them in our gardens. Spores spread at high speed from woody plants, vegetable beds, weeds.

Phlox disease types

The most common and dangerous diseases of phlox, whose treatment is late, can infect nearby plants.

Types of fungal diseases:

  • erysiphe cichoracearum, or powdery mildew,
  • septoria phlogis sacc, or septoria,
  • uredineae, she's rust,
  • phoma phlogis, or fomoz,
  • verticillium arboatrum, otherwise verticillous wilting of the stems.

Types of viral diseases:

  • variegation,
  • ring spots,
  • curliness
  • mosaic.

Mycoplasmosis is dangerous because it spreads, albeit slowly, but if it gets hooked, you have to say goodbye to plants. While this is a rare disease. How do phloxes suffer from diseases that have been treated for a long time? Steadily, whenever possible try to console the gardener with flowering. But the appearance of the plant gives the presence of the disease.

Viruses - what is the danger

Spread viral diseases garden pests: aphid, mites, cicadas, roundworms. Plants affected by the virus cannot be cured. Flower growers must constantly monitor the situation, inspect their flowers, know the signs of diseases and fight for the survival of healthy plants.

Thus, with variegatedness, light, randomly arranged strips on the flowers that have opened appear. The habitual appearance of phloxes changes, they become faded and stunted.

Ring spotting distorts the entire plant in the last period of the disease, and at first innocent light circles on the leaves give out a viral disease.

Bushes infected with the curly virus twist the leaves into a spiral, but such phloxes will not please you with flowers. The death of the plant is inevitable.

The mosaic "decorates" the leaves with irregular-shaped spots, the plant nutrition worsens, a lot of energy is wasted, phlox gradually perishes in an unequal struggle.

Fungal diseases - we will treat

White spot and rust differ only in the color of stains. White, gray-brown or bright brown irregular spots that appear on the phlox of the paniculate, gradually deplete the bushes, the lower leaves dry out. The disease progresses rapidly, switches to other instances. The fight can be effective, it is enough to work the bushes with Bordeaux mixture once every 7 days. Florists study phlox diseases and their treatment. Photos of affected flowers often help in the diagnosis of viral and fungal diseases.

Verticillosa wilt stems (wilts) gardeners call "lightning." Wilt affects plants during flowering, the leaf dries out very quickly, the bush does not look aesthetically pleasing. Stems endure the disease, and the root system is covered with white or brownish bloom. If you are late, the disease will destroy the entire flower bed. The fungus, the causative agent of wilting, enters the soil with acidic sawdust, manure earth. Breeds on acidic soils. Liming and treatment with ash solution will not allow wilt to develop. But if this has already happened, you should remove the plant from the ground, cut the bush and rinse the roots in a disinfectant solution. Any drug against fungal diseases, for example, Fitosporin, will work.

Phloxes are picking up the buds, be careful

Almost all phlox diseases are actively progressing during the budding period. Is no exception and fomoz. The plant changes its appearance, the leaves dry out, and the stem is covered with cracks. The fungus penetrates the tissues, the twigs become brown. The disease recedes if 1% Bordeaux liquid is applied to the soil in late autumn and early spring. Phomoz in the soil are capable of manure with mold, raw sawdust. The fungus quickly infects the plant. Ill with phlox disease.

Treatment (photo of treated plants confirms this fact), fortunately, is valid. It is seen that the upper young leaves are healthy.

Brown spots and spots on the leaves appear from Septoria. Phloxes turn yellow, leaves are framed by a brown color or purple border. The trunk is exposed, the sight of a sick bush does not please. But the disease will weaken from the therapeutic spraying of a mixture of milk of lime diluted in water and copper sulfate. Three sprays at intervals of 7-10 days is enough to get the disease gone. Missed a chance, cut the affected stems and burn them. The earth is watered with a copper-containing lime 1% solution. If they receive phlox care, and the disease will recede, and no hardship will prevent beautiful flowering.

Insidious White Dew

Everyone is accustomed to assume that powdery mildew affects the tender and juicy leaves of peppers and cucumbers. Phlox, though they have a solid stem, but they cannot stand in front of this insidious fungus.

A white patina appears on the plants in the form of carelessly scattered flour. It grows very quickly. The color of the thick, suede plaque changes. It becomes brown or gray, it inhibits the plant. The leaves begin to dry out, the breathing of the plant stops. Often affects plants during the wet summer. Infected flowers are the spores of the fungus Erysiphe Cichoracearum. All parts of the plant above the ground suffer from the disease.

The spread of the disease contributes to the overfeeding of plants with nitrogenous fertilizers in the spring. Pampered bushes are not able to deal with such a scourge. Any kind of phlox disease is dangerous. Mealy dew (photo with a white coating on the leaves) is the most dangerous of them.

Creating flock mixborders, first of all it is necessary to prepare the ground for planting. Soil these flowers prefer loose, neutral, nourishing, breathable. Refilling it with fresh manure is absolutely not recommended. These handsome men only fit well-rotted, three-year manure. Top-dressing during the summer in the doses indicated on the fertilizer package strengthens the paniculate phlox bushes.

The benefits of fertilizing with mineral fertilizers are obvious: when plants get timely nutrition, they are less sick. Elimination of excessive acidity of the soil, drainage from flower beds in the rainy season and watering during the dry season, give plants a chance to avoid insidious diseases.


Processing Bordeaux mixture twice a year will not allow fungi to spread. Spraying "Epinom" enhance immunity. Good results are obtained by trimming the tops during the rainy period. This defers flowering period. If the florist conducts timely treatment of phlox disease, powdery mildew will not be able to cause harm.

Any suspicion of the development of the disease requires preventive measures. Treatment with ashes, Bordeaux liquids, and antifungal drugs will help prevent ailment.

In the fall, the branches break off and burn, the bush is mulched, and is curled up with earth. Damaged by frost, phlox roots protruding from the ground can damage the health of a flower.

Treatment or farewell

Even the best and most experienced grower has periods when preventive measures are not enough, and diseases win. Intensive, systematic treatment saves some of the plants. Fungal diseases can still be tried to heal.

If there is a place, it is better to plant a bush by transshipment, and to heal for 3 weeks. Does the treatment fail? Destroy the plant without regret and do not risk the whole collection of your flowers.

We noticed that the culprit of phlox disease in the flower garden is a virus - a plant in the fire. Why is the recommendation so categorical? Otherwise it is impossible. Neither for the fence, nor to the compost, nor to the neighbor can the infection be transferred. She will return to your bed very quickly.

If fungal diseases of phlox were found, the treatment will be gentle. Flowers successfully recover with proper care. The main thing - to find the hearth and destroy it, disinfect the soil.

Brown and rusty spots on the leaves

If on the leaves they saw brown spots, like with chickenpox on human skin, which becomes larger every day. Over time, they merge into one large spot, which completely destroys the leaves, making them yellow, then bringing to a state of rot.

This disease is caused by a fungus that can multiply in all weather conditions. It is carried by air. You can get rid of it by any copper-containing drug by spraying the bush and soil. This procedure as a prevention does not hurt to do it every two weeks.

Verticillary wilting

If yesterday the blooming culture has suddenly faded today, tear off the leaf from the stem and carefully examine its root. With verticillary wilting, the petiole has a brown color. It is a fungus, parasitic in the vessels.

The stem will look straight, healthy, but it will be decorated with twisted and yellowed leaves. After three months, the flower dies completely. Unfortunately, there is no escape from this fungus.

But as you know, hope dies last. You can still try to save the vegetation. First, they dig it up. Then gently shake the roots off the ground, thoroughly washed them in the preparation "Maxim". For the first time, it can be planted in a pot, before it put "Trichodermin" in the ground.

If you have noticed the first signs of the disease, then immediately pour the soil with the “Maxim” preparation and sprinkle with ashes to reduce its acidity.

Jaundice phlox

This disease occurs very rarely. It is carried by insects that feed on plant sap. Most often these insects are cicadas.

If you notice that the culture has become slower to grow, the leaves have turned yellow, have changed their shape, and the inflorescences have acquired a greenish color, the stamens have become thin, then these are all signs of jaundice. The infected, unfortunately, no longer save. It remains only to dig and burn.

But you can protect the phlox from this disease by sprinkling it with Fundazole every summer. If it grows as a houseplant, it is recommended to repot it every four years. They should not grow in crampedness. If they have grown too large, they should be seated.

Mealy dew

It infects not only street, but also indoor flowers, as the spores of the fungus are transferred through the air. Downy mildew mainly breeds in rooms where the temperature is close to zero for a long time and high air humidity is maintained.

True powdery mildew can multiply even with dry air; it chooses sluggish plants and finishes them to the bitter end. Likes, when the air temperature changes dramatically, the air becomes either wet or dry.

External signs of false and true mealy dew are slightly different.

  • The leaves are covered with white bloom, which can be erased with your fingers.
  • Initially, the plaque appears on the lower leaves, then moves to the upper ones.
  • If the disease is not treated, then the white spots become brown.
  • White and brown spots quickly fill the entire space of the leaves, after which they dry.
  • Then spots go to the stems and petals.

  • The leaves are massively covered with yellow spots, after which they shrivel.
  • Infected plates on the leaves dry out and fall off in the form of fragments, after which, flying through the air, infect the surrounding vegetation.

All plants infected with powdery mildew are treated equally.

At first, all the bushes are treated with any preparation containing copper: “Scor”, “HOM”, “Topaz”. Can and handle Bordeaux mixture. Then all infected processes are removed so that healthy ones do not have time to become infected. It is desirable to process every week until the flower finally recovers.

To prevent phlox infection with powdery mildew, they need to be treated with the above preparations all summer every two weeks.

Insects, which feed on their juice, are infused in both street and indoor flowers. Nematode - of them. She is able to completely destroy the tall bush. It is difficult to get rid of it, but it is possible.

Usually, when it is warm outside, it moves around the plant inside its trunk, forming growths outside. And she spends the winter in the soil.

In phlox, affected by the nematode, the stem is not only bent, but covered with growths, and its leaves curl and shrivel. The stem itself becomes very fragile, it is easy to break it with two fingers.

If the bush is completely infected with a nematode, then it must be excavated and burned, since it is almost impossible to remove pests from it. If the upper shoots look healthy, without growths, then, to save the variety, the top is cut off and thoroughly washed under a tap, then planted in fresh ground.

And the lower half is burned along with the ground. To prevent the nematode from getting into the phlox, the soil during transplantation is mixed with rotted straw dung.


This is the most dangerous virus that can instantly destroy a seemingly strong bush. The fact that he is infected with variegation, says the appearance of light stripes of different widths on the inflorescences and leaves.

The virus first deforms the petals, changing their color, then completely destroys them in a short period. But before death, the flower manages to infect neighboring plants with the help of pollen, seeds, insects, tools.

The disease can be quickly recognized by comparing the color of greenery or inflorescence with a photo of this variety. But the exact result will give only a detailed examination in the laboratory.

If the petals are white, then in this case carefully examine its eye. In a healthy one, the eyes will have a distinct border, and in those infected with a variegatedness, the borders are erased, that is, the color of the eye merges with the white petals.

Each year, breeders produce new varieties of phlox, so during the purchase it is recommended to carefully compare the flower color with a photo of this variety, otherwise the risk of acquiring a diseased plant from dishonest sellers increases, thereby ruining the entire home collection of indoor flowers.

It is especially difficult to recognize this viral disease in varieties that are initially variegated in color. In this case, carefully look at the strips. In a patient, they must be expanded towards the end, intermittently interrupted. Healthy stripes are even.

Unfortunately, there is no medicine for this virus. It remains only to dig and destroy the infected shrub, and throw the earth away, or even better, burn it.

After which the pot and tools are carefully sanitized. Then during the month it is recommended to carefully observe other plants in this room, if they did not catch the virus. If the flower grew on the street, then you need to carefully examine all the greens growing around it, whether the virus was transmitted to them.

Cracking stem

If an open vertical crack appeared on the stems of phlox, and the shoots fell along with the inflorescences. Do not worry, this is not a contagious disease.

The reason for the appearance of cracks on the stem is too fast growth of the plant. But they may appear due to excessive amounts of nitrogen fertilizer. It is necessary to reduce the feeding. And they can also crack if they are not watered for a long time in hot weather.

Also a fungal disease that manifests itself at a time when the bush begins to bloom. In phlox, the lower leaves turn yellow during phomosis infection, and the base of the stem becomes brown, then fragile and breaks under its own weight. It is impossible to cure this disease, but the tip, which has not yet had time to catch the fungus, can still be saved.

To do this, cut the top off, hold it for some time in Maxim or Fundazole, then transfer it to a new land. Usually this disease infects three-year plants. To avoid fomoz, before each flowering need to spray flowers Bordeaux liquid every ten days.

Why are flowers sick?

At the first symptoms, it is necessary to treat both diseased specimens and other plants. This procedure is necessary for the purpose of prevention. Но некоторые садоводы не могут понять, почему пропадают флоксы, так как болезни цветущих растений в их начале сложно распознать. Поэтому необходимо взять за правило внимательно осматривать грядки раз в две недели, чтобы не пропустить начало недуга.

Очень важно дезинфицировать садовый инструмент, через который может передаваться инфекция. Это позволит предупредить заболевания.

Also the cause of death can be improper care:

  • insufficient watering
  • transplanting in summer or late spring,
  • growing on too acidic soil,
  • using too cold water for watering in heat,
  • untimely thinning of landings.

What are phlox diseases and how to treat powdery mildew?

This disease affects the leaves of plants only in hot weather with low humidity. Flowers are actively infected in the second half of summer. The lower tiers suffer first, then the disease spreads to the stem and upper foliage. Its causative agent is a fungus. Treatment of such a disease as powdery mildew, phlox is rather laborious.

The best way to fight this infection is prophylactic treatment. To do this, from the beginning of summer, flowers should be periodically disinfected with copper-based products, Topaz or any other fungicide. A good result is given by spraying with a solution of furacillin prepared at the rate of 20 tablets per 10 liters of water.

Regardless of what phloxes are sick of and how to treat these plants, it is necessary to process other crops growing in the neighborhood.

Preventive measures against powdery mildew are:

If the disease struck the plant, do not despair. There are many options than to treat phlox from powdery mildew.

Disinfection can be carried out:

  • any copper-containing drug (for example, vitriol),
  • a mixture of vitriol (20g) and soap (150g) dissolved in 10 liters of water,
  • soda (50g) with soap (50g), the dosage is also per 10 liters of water,
  • infusion of ash (10 water and 3 kg of ash).

Spraying is carried out several times at weekly intervals. After flowering phlox is cut and processed again. Good results are obtained with the use of Topaz, Topsin or Skor drugs with a break of 10 days. It is also possible to spray these drugs to prevent diseases throughout the entire growing season of the plant.

Why do the leaves turn yellow?

If you are looking for why the leaves turn yellow in phlox, it is possible that the flowers were struck with “jaundice” - a mycoplasmal disease caused by pathogenic microorganisms. Additional signs of the disease is the dwarfism of flowers and the deformation of the leaves. The infection is carried on the cicadas, so it spreads very quickly. More than 200 species of plants suffer from jaundice. To catch such an infection is easy. This insidious disease has a very long incubation period - up to two months. Therefore, it can manifest itself in the next phlox flowering season. Older specimens are sick much more often than young ones.

Struggling with "jaundice" by taking such measures:

  • bushes are systematically thinned out, they are transplanted every 3-4 years,
  • In June, for the purpose of prophylaxis, treatment is carried out with Fundazole or Zineb
  • heavily yellowed plants destroy.

White bloom on phlox

Beginning gardeners perceive any white bloom on the leaves as powdery mildew. But peronosporosis is often “masked” under it. Another name is downy mildew. Its difference is that it develops on plants exclusively at high humidity and lower temperatures. Downy mildew affects phlox in late summer and early fall. Contribute to the spread of infection dense planting and the presence of weeds in the garden beds. It covers the plates with a thin white patina, because of this they cannot carry out photosynthesis. The leaves curl and gradually die off.

How to treat white bloom on phlox:

  • process all bushes with preparations based on copper, Bordeaux mixture, Topaz, Home,
  • cut the affected leaves and burn them,
  • Since the beginning of summer, every two weeks, spray plants for the prevention of a solution of copper or pollinate sulfur with an interval of 10 days.

Both false and true powdery mildew infect flowers from the bottom up. Therefore, it is important to regularly inspect the lower tiers of landings.

White leaf spot (septoria)

Spotting causes different types of fungi. These diseases are characterized by the formation of spots on the leaves.

White leaf spot (septoria). The causative agent of the disease is pycnidial mushroom (Septoria phlogis). Septoria infection affects phlox in the open field and in greenhouses during the rooting of cuttings. The fungus winters on fallen leaves, and therefore infection of young leaves begins in the spring at the first appearance of growing shoots. In early summer, on the lower leaves, and later on the upper, small irregular-shaped spots appear, grayish with a brown border and dark dots - the pycnidia of the fungus.

The leaves turn yellow, curl, die off and fall off. The tissues of the stems crack. Plants bloom poorly, lose their decorativeness and may die. Especially intensively the disease develops on weakened 2-3-year-old plants and cuttings.

The most susceptible varieties are: Wurttembergia, Donar, Michurinets, Pavel Rublev, are resistant - Henry Hertz, Panama, Gaganov Seedling, Schneepyramien.

The most common diseases of phlox, measures to combat them and how to prevent.

Phlox (lat. Phlox) created for joy. Many FORUMHOUSE participants managed to collect impressive collections of these perennial plants with inflorescences of various flowers. But these are gentle creatures, prone to disease, they are loved by pests. Phlox also suffer due to improper agricultural practices. What to do if phloxs get sick, how to treat and how to treat for prophylaxis, consider the experience of users of our portal.

Leaf spot

On one of my phlox seems to be spotted. I do not know anything about this, too, would have heard people who know.

Leaf spot is a viral disease. Most often, varieties with violet-lilac or pink-red shades suffer from it, with white phlox blotch is much less common. It usually appears in the middle of summer, just like in the photo above, stained on the leaves. Over time, the spots become larger, the leaf tissue in this place becomes dry, then the leaf dies. At the first signs that the plants are beginning to fall ill, it is recommended to remove the affected leaves. If there are a lot of them on the stem, you will have to cut the stem. Leaf spot is a viral disease, so the stem must be burned. A necessary condition for the fight against the virus: it is recommended to treat not only the diseased plant, but also the neighboring plants, and also to cultivate the soil around the diseased bush. Spotting is treated with a solution of ferrous sulfate (3%), Bordeaux mixture (1%), copper oxychloride (0.7%).


These are flowers from the same phlox! Some are exactly painted, while others are striped! And I sit crying. Well, of course - "variegation". The disease is viral and contagious. And diseased plants must be thrown away!

The photos clearly and clearly show how the variegation manifests itself - bright stripes appear on the petals, in neglected cases the whole flower brightens. Often the hosts feel sorry for phloxes, they think that nothing terrible happened: well, think about it, the flower has brightened. But besides the loss of varietal characteristics, the virus affects the other qualities of the plant. They bloom badly, and in most cases the plant still dies over time. The spot-like punctuality also affects the tulip, carnation and other plants - you can spoil the whole flower garden!

Therefore, if the flowers on your site are suddenly spiked, ruthlessly remove this bush as a whole, and in any case do not take cuttings from it. When planting new plants in this place, caution is advised, as the soil may be contaminated by nematodes that carry the virus. It makes sense to treat the soil with metaphosis (0.2%). It is very important to remove the weeds next to the phlox plantings - weeds can also be carriers of the infection.

The disease itself, i.e. virus itself, there is nothing to treat. Only burn the plants. But then the earth and everything else - a remedy for nematodes, it nematodes spread the infection.

For the prevention of nematodes near phloxes, it is not bad to plant taggetis and nasturtium, which disinfect the soil well. At the slightest suspicion of nematodes, the flower growers also water the plants once a week with a solution of decaris (tablet per liter of water per bush).

Mealy dew

Here is the smartest phlox bush Olena Helena four cold days completely covered with powdery mildew. The bush had to cut.

How to handle phlox in the spring.

But "besides the guillotine, there are other means," and you can try to stop the powdery mildew. Good results are shown by treatment with modern drugs: Tiovit Jet and Topaz. There are folk remedies: spraying infusion of ash, soda solution with the addition of vegetable oil, etc. But the best and only reliable way to combat powdery mildew is prevention.

Mealy dew is one of the types of fungal diseases. On phloxes, it appears the same as on other plants: powdery white spots appear first on the lower leaves, then on both the upper and the stem. Most often, the old sorts of plants are susceptible to powdery mildew, especially if they are not properly cultivated - when the planting is thickened, the bush has more trunks than necessary, it does not air out and does not get enough sun. Mealy dew not only reduces the decorativeness of phlox, but also weakens it. This bush is much worse tolerate wintering than healthy.

To phloxes, the most important thing is to apply preventive measures. If I process several times in the spring, I don’t know the whole vegetation period. I was a bit lazy, everything: neither folk methods, nor chemicals save. You have to chick them under the spine.

The fight against powdery mildew should begin in early spring, when phlox grow by 3-5 centimeters. Caring for these plants provides for the first event - “spilling” with a weak solution of blue vitriol, at the end of May, and then, at the end of June - spraying “Topaz” or “Skorom”. In extreme cases, drugs can be replaced with a solution of baking soda (a tablespoon per liter of water).


This is what phlox found in the bushes. What happened?

Jaundice is another fungal disease that affects phlox. You can recognize it by the following features: the plants do not start flowering, instead of flowers we see such terry leaf-like formations, as in the photo. The phlox bush slows down its growth, leaves change color and shape.

Older plants are more likely to get jaundice than young ones, so phlox needs to be replanted every three to four years. As in the case of other fungal diseases, jaundice is easier to prevent than to cure, and it is warned by adhering to agricultural technology, planting in the right place. It is important to prevent thickening of plantings, the bush should be aired.

If jaundice is still manifested, the affected part of phlox is removed and burned. In the fall, they collect all plant residues and burn them too so that the infection does not spread to the rest of the bushes, and the soil at the site of the bush is well dug up.

Prophylactic treatments are done two or three times, with a 0.2% foundation suspension. Spraying begins after the phlox fully grow leaves.

Hair loss stalk

Alopecia stalk phlox - a common thing, for many gardeners, "legs" 15-20 centimeters from the root - these are bare stalks with dry leaves. Neither mulch nor good watering helps to avoid this scourge.

If only the lower leaves dry, this is normal.

But if the lower leaves dry, as in the next photo, this is not normal. This usually happens with phloxes, which have not been divided or transplanted for a long time. A transplant every three to four years is not a whim, but a harsh necessity.

On FORUMHOUSE, they will help you determine exactly what your phloxs are ill with, create a mixborder. And our video will tell you good ready-made solutions for your flower garden.

Drying and leaf fall

The main reason why the leaves of phlox turn yellow and die,water shortage. Plants with a shortage of water begin to reduce their leaf cover. This process lasts until the resumption of water flow, or until the death of the flower.

Help needed is abundant watering and spraying. If the flower is recently transplanted, it is necessary to shade it.

Cracking stems

During the period of intensive growth of phlox (May-June), the formation of longitudinal cracks on the lower part of the stem is possible.

The wound is gradually covered with a tumor in the form of an influx (callus), the stem grows coarse, loses its elasticity (the severity of the inflorescence and the wind can lead to a fracture of the stem).

Among the causes of cracking - high nitrogen content in the soil, excessive acidity.

Viral diseases of phlox, their treatment

One of the main reasons why phloxes disappear is viral diseases. Viruses cause a change in the appearance of the flower - the size decreases, ugly mutations appear: the shape of the leaves and flowers changes. In viral diseases, there is no treatment as such:infected plants destroy.

There are no special viruses inherent only in phloxes: they are infected by the same viruses that cause tobacco, potatoes, tomatoes, etc.

Viruses can be transmitted to phlox in various ways:

  • through garden tools (shovels, choppers, pruners),
  • through molehills,
  • through the remains of infected plants,
  • through pests
  • through cuttings and seeds.
Among the most common viral diseases are leaf wrinkling, ring and necrotic spots, rattles, and variegation.

Curly (wrinkled) leaves

As a result of the defeat of the virus (cucumber mosaic, tobacco necrosis), plants are modified:

  • the leaves are covered with scabs, necrotic stains, curly and covered with bumps, often a black border, yellow mosaic pattern appears on the edge of the sheet,
  • the stem is deformed, covered with scabs, its brittleness increases, it often takes a dwarf form,
  • habitus bushy and stunted, flowering does not occur, the plant may die.

Leaf spots

The disease is caused by the virus ringing tomatoes. Infection occurs through nematodes (Longidorus) in May and June.

First, there are bright yellow spots on the leaves in the form of a ring pattern. Gradually, the spots become larger, they cover the entire surface of phlox, the leaves begin to deform, then curl.

Phlox ceases to bloom, the plant begins to wither.

Necrotic leaf spotting

Caused by a cucumber mosaic virus. The disease begins with the appearance on the blossoming leaves of small (1 mm) round brown spots.

Spots grow, merge and cover the entire area of ​​the sheet.

Leaf filament

Filamentousness in phloxes is caused either by defeat by nematodes (Ditylenchus dipsaci), or by infection with a virus (cucumber mosaic).

The leaves of the plant mutate - become narrow with teeth on the edge.

Patients phloxes develop poorly, the habitus changes - there is no flowering, the released shoots are fragile and small, dwarfism of the bush appears. The disease ends with the death of the plant.


The disease manifests itself in May-June. On the leaves there are spots in the form of rings and half rings, stripes. Their color is from light yellow to green-yellow. Spots increase in size and quantity. Flower growth is inhibited.

Tobacco rattle virus is caused by the disease of the tobacco rattling virus. It is transferred from soil by nematodes. Sometimes phlox can be latent carriers of the disease.

Fungal diseases, their treatment

Fungal diseases are caused by pathogenic effects of fungal microorganisms (alternarii, rust fungi, septorii, etc.). Fungal spores, falling into the cracks of the stem or spores of leaves, penetrate the plant. Mycelium grows with spore-bearing bodies. On the leaves begin to appear brown spots, spots that merge, the sheet dies.

The negative effects of fungi on phlox:

  • tissue destruction of all parts of the plant,
  • violation of regulatory processes,
  • intoxication plants.
Reproduction of fungi is especially active in damp conditions and in violation of agricultural technology. The most common phlox are septoria, fomoz, powdery mildew, rust, etc.

Caterpillars scoop and butterflies

Caterpillars garden shovels, cabbage moth, other butterflies are characterized by increased voracity. They eat all the leaves, flower petals. A flower can be completely destroyed by these pests.

Fighting against caterpillars involves:

  • the destruction of weeds in the area of ​​phlox growth,
  • manual collection of tracks
  • spraying “Karbofos” or “Inta-virom”.

Cruciferous black flea

In the spring of cruciferous beetles - black cabbage fleas, are a great danger for phloxes. They eat green leaves and young shoots of phlox. Folk agrotechnology has developed its own methods of pest control:

  • sprinkle the leaves on both sides with wood ash (three times in 4-5 days),
  • to powder the plant and the ground with a mixture of ash, tobacco, slaked lime or ground black pepper,
  • spray fleas mixture: 10 liters of water and 2 tbsp. spoon vinegar solution (70%).
These methods are ineffective in the case of rare cottage sites. More reliable means - "Aktellik", "Decis", "Banco", etc.

Phloxes are often affected by round (0.8–1 mm) small filamentous worms — leaf and stem nematodes. This is a real scourge of flowers. Parasites feed on plant sap.

When sucking juices, the phlox stalks become crooked, blooms appear, the flowers become smaller, threadlike leaves appear on top. The plant often dies. Signs of defeat by nematodes on phloxes appear only by the end of June - the beginning of July.

При сильном заражении участка заболевшие растения выкапывают и сжигают, участок обрабатывают хлорной известью или формалином.

Известные нематодициды очень ядовиты, и в саду их лучше не применять.

Борьба с болезнью включает ручной отбор пострадавших растений, а также черенкование здоровых веток куста (перед высадкой на укоренение черенки промыть в проточной воде).

Gardeners are advised to carry out cuttings of valuable varieties in the spring (when the soil temperature is below 10 ° C and the stem height has not reached 5 cm).

Cultivated slugs are most dangerous for phlox, they cleanly eat young shoots, leaves, flowers. Very fertile (slug can lay up to 400 eggs over the summer and autumn). During the day they hide in shelters, at night and in rainy weather in the daytime they go out to feed.

The best measure to deal with slugs - trapping. Catch both manually and with the help of traps: boards on the site, boards on the tracks, trays with beer. The area with phloxes and approaches to it can be sprinkled with ashes, lime, superphosphate - slugs will not overcome the obstacle, until the rain does not wash them away. After the rain - repeat.

Drooling pennitsa

From May to June there is a great threat to phlox from the larvae of the penny bug bed drooling (settle on the underside of the leaf, where they emit frothy substance). The larvae suck the juice from the leaves, the plant languishes and does not bloom.

In case of single lesions, the leaves can be plucked along with the larvae (the larvae may try to hide, jump off the leaf). In case of mass infection, treat with Inta-Vira solution (especially the inside of the leaves).

Filamentousness and fern leaves

These symptoms cause a viral color disorder. They are the most difficult in terms of treatment. Plants with such lesions to save very hard.

When the phlox is thin, their shoots become fragile, the bushes grow very low, they do not bloom. The leaves are narrow, filiform, often with wavy edges. In the second case, phloxes resemble a fern: very small leaves appear on them, attached to the central vein. Both types of deformation of the plates lead to the fact that they can not fully perform their functions. The plant does not develop well.

There is no effective treatment for filamentous and fern leaves. Affected specimens must be excavated and destroyed, and the soil treated with formalin or solution of blue vitriol. Cutting affected phlox should not be.

They carry nematode viruses, so pest control is one of the effective measures to prevent viral phlox diseases. Effective preparations are Carbation, Chlorpicrim, Nemagon. It is also recommended to carry out soil disinfection before planting with Acarin or Fitoverm. Favorable to plant next to the beds of phlox nasturtium. She scares away nematodes.

It is difficult to treat phlox, like other plants. Therefore, in order not to look for what phloxs are sick of and how to cure them of any damage, it is better to prevent the occurrence of diseases in advance. And for this you should follow the proper care of flowers.

Fungal diseases

They are especially popular during rainy days with strong temperature fluctuations.

1. Mealy dew

It has the appearance of a raid. The color is white, sometimes with gray or brown shades. Mealy dew infects the leaves and stems of phlox.

Prevention: In late spring, it is necessary to treat the plants a couple of times with a weakly concentrated copper solution. Do not overfeed with nitrogen. Protect against blackouts.

Treatment: with a break of a week to spray the plant with a 1% solution of soda ash.

Mealy dew is one of the most common diseases of phlox.

2. Rust

At first, the disease manifests itself as separate rare points of rusty color. They appear initially on the leaves, and then gradually increase and move to other organs and plants.

Prevention and treatment: similar to white spot: the ground around the bush must be treated with a 1% solution of Bordeaux mixture (several times with a break of 1 week). The affected parts should be cut and burned.

3. Wilt (or wilt)

The disease affects phlox during flowering. The disease is characterized by a sharp wilting of the leaves, but the stems still look healthy for a long time. The roots are covered with brown or white bloom.

Prevention: top dressing with ashes.

Treatment: wash the roots of the plant, hold it in the disinfectant preparation for a little and transplant in a new soil.

You can prevent the phlox from withering with ash.

4. Button Rot

It appears before the flowering of phloxes, when the lower leaves of the plants begin to wither, and the stems acquire a brown tinge at the root.

Prevention: In the autumn, it is necessary to prune the phlox bushes and burn the cut parts. In early spring, the ground should be treated with a 1% solution of Bordeaux mixture.

Treatment: rinse the roots about 20 min in 0.5% Bordeaux liquid and transplant the shrub.

5. Septoria (or white spot)

The disease manifests itself in the form of gray-brown specks of irregular shape on the sheets.

Prevention: in late autumn, cut off phlox bushes and burn the cut parts of the plant.

Treatment: process the ground around the bush several times with a 1% solution of Bordeaux liquid with a break of 1 week. Cut and burn affected parts.

Despite the name of the disease, it is characterized by gray-brown spots

Viral diseases

Virus, roundworms, ticks and cicadas are considered carriers of viruses. Prevention all viral diseases is to analyze the soil for the presence of pests and constant thorough inspection of the bushes. Treatment Phlox virus diseases do not respond.

1. Diversity. It is determined by the light stripes on the open flowers, randomly arranged and distorting the characteristic look of the bush.

2. Ring spots. On the sheet appears in the form of a bright circle. Very quickly, the plant begins to deform and dry out.

3. Curly. It is the leaves that suffer from this disease: they acquire a spiral or wave-like shape. Usually, the phlox bushes infected with this virus no longer bloom and quickly become covered with necrotic patches.

Leaf curl is a fairly common phlox virus disease.

4. Mosaic. This disease is often manifested along with budding. On phloxes, bright irregular spots form, randomly located on the foliage.


Excited by a group of organisms that are at an intermediate stage between viruses and fungi. Mycoplasmosis is spread mainly by cicadas. For phlox, a characteristic disease of this group is jaundice. It is manifested in the lag of plants in growth, the stems are covered with light yellow spots.

Prevention: as in the case of viruses, constant monitoring of the soil and plants is necessary, since no treatment was found. Plants affected by jaundice must be destroyed immediately.

Jaundice is a very dangerous phlox disease that cannot be cured.

Phloxes can suffer from many diseases, but if preventive measures are carried out in a timely manner and they are well cared for with these flowers, they really will not cause much trouble.