Petunia diseases - looking for the best medicine for flowers. Petunia leaves covered with white bloom

A white coating appeared on the leaves of my petunias, the plants do not look the best. I have never encountered such a disease of flowers. There are few affected leaves, I cut them off. I do not want to say goodbye to flowering at the beginning of the season.
What can be processed? - That's what I found on the pages of flower growers and gardeners.
White plaque on the leaves of petunias is powdery mildew, a rapidly developing fungal disease of plants and shrubs. The plaque is white and looks like dust or powdered sugar at first glance.

Over time, the plaque grows and captures not only the leaves, but also other parts of the plant. Old leaves gradually turn yellow and die, and new ones grow twisted and unhealthy. If treatment is not started, the plant will die.

Advice! If a white coating is found on the leaves of a petunia, it is worthwhile to start treating the plant immediately.

If you increase the white bloom on petunias, you can see small sores on the leaves. The tissue of the plant is literally "eaten" by a fungal formation. Powdery mildew takes away all the nutrients from petunia cells and also interferes with the natural process of photosynthesis. It is necessary to get rid of such a raid as quickly as possible in order to prevent the death of the petunia.

Causes of Powdery Mildew

The weather is cool and humid. The influence of weather conditions is possible when the petunia grows on the street or on the balcony. For indoor plants, seasonality does not seem dangerous;
- a large amount of nitrogen chemical compounds is concentrated in the soil;
- the plant is rarely thinned out;
- Irregular watering. For example, when plants begin to water, without waiting for the soil to dry. Or vice versa, the earthen soil is completely dried out, and later it is poured. Such actions lead to a violation of the immunity of the plant.

In addition to external, third-party influence, the development of spores is possible if the petunia was poured with contaminated water, touched with hands after touching the infected petunia. It is also possible to transmit the disease through the air, from diseased plants and shrubs.

Petunia disease control

You can get rid of powdery mildew on petunias only with an integrated approach to treatment. First of all, you need to properly care for the plant, namely:

It is necessary to water the petunia only after the complete drying of the soil, its upper layer;
- from spraying during the fight against powdery mildew should be abandoned;
- the infected plant is taken out to a sunny place until it is completely cured;
- launched plantings must be thinned out and cut off the dead leaves;
- during the disease it is not advisable to use nitrogen fertilizers.

Advice! For a speedy recovery of the plant, it is worth adhering to the rules of appropriate care.

It is necessary to correct the care process, otherwise it will not work for a short time to get rid of powdery mildew.

After adjusting the care, the algorithm of actions will be as follows:

Make cardinal pruning of the affected areas of the petunia. You need to cut off all the flower stalks and leaves. The more diseased plants are removed, the faster the healing process will go.
Fungal spores are in the top layer of soil, it must be replaced with another one.
Treat the petunia by spraying or watering with one of the medicines. It is necessary to spray as abundantly as possible, you can even dilute the medicine in a basin and dip the plant bush into the resulting mixture. You also need to process the pot and pallets.

Advice! In order for the petunia to get rid of a fungal disease, it is worth removing all damaged parts of the plant, as well as replacing the infected soil.

Mixtures and preparations for the treatment of petunia

Such methods can only stop the development of the disease, but in order to completely eliminate the fungal infection, you will have to resort to the use of serious chemicals.

Here are a few recipes for treating white bloom on petunia leaves:

20 grams of soda ash and some liquid soap, dissolved in 5 liters of hot water. The resulting chilled solution is sprayed with petunia and soil.
-30 grams of grated garlic are poured into 1 liter of water. The solution is infused for a day, filtered and after that they can be sprayed with petunias.
-for 2 tbsp. mustard powder - 10 liters of pre-boiled water. The cooled solution can be watered with a petunia, and also sprayed onto the plant.
-100 grams of horsetail is poured with 1 liter of water and infused for a day. After that, the mixture is boiled for about two hours, then cooled and filtered. You can spray on the plant by diluting the infusion with water in a ratio of 1:5. You can spray regularly to prevent the occurrence of fungal infections.
If the situation has gone too far and folk methods cannot save the petunia, then you should use chemicals. Fungicides in the fight against powdery mildew are very effective and can stop negative processes at the cellular level of the plant.

Depending on the preparation, it is recommended to spray the petunia no more than four times with an interval of 5-7 days. The most effective drugs are: Vitaroz, Acrobat MC, Fundazol, Forecast and Previkur.

Some advise such a drug as Fitosporin. However, it should be said that in the treatment of petunia, it will be ineffective and is only suitable as a prophylactic.

Here are some more tips from growers:
This is powdery mildew, spray it urgently !!! The most effective preparations for powdery mildew:

Fundazol;
Topaz;
Acrobat MC;
Previcour;
Speed;
Vitaros;
Amistar extra.
Well-known fungicidal drug - phytosporin
And further:
2. From baking soda and soap

In 4 liters of water dissolve 1 tbsp. l. baking soda and 1/2 tsp. liquid soap. Spraying is performed 2-3 times with an interval of 6-7 days.

3. Potassium permanganate solution

2.5 g of potassium permanganate are dissolved in 10 liters of water, used 2-3 times with an interval of 5 days.

4. Serum solution

Serum is diluted with water 1:10. The resulting solution forms a film on the leaves and stems, which makes it difficult for the mycelium to breathe. At the same time, the plant itself receives additional nutrition with useful substances and improves health, which affects the improvement of its appearance. Treatment with a serum solution is carried out in dry weather, at least 3 times, with an interval of 3 days.

5. Decoction of horsetail

100 g of horsetail (fresh) is poured into 1 liter of water, kept for a day. Put on fire and boil for 1-2 hours. Filter, cool, dilute with water at a concentration of 1:5 and spray the bushes. The concentrate can be stored in a dark, cool place for no more than a week. Spraying with horsetail can be carried out regularly to prevent powdery mildew in the spring and summer. In the fight against an existing disease (in the initial stage), 3-4 times spraying with a frequency of once every 5 days is effective.

6. Copper soap solution

This remedy for powdery mildew is highly effective due to the inclusion of a well-known fungicidal preparation - copper sulfate. In a glass (250 ml) of hot water, dilute 5 g of copper sulfate. Separately, 50 g of soap are dissolved in 5 liters of warm water. After that, carefully, in a thin stream and with constant stirring, pour the solution with vitriol into the soap solution. Plants are sprayed with the resulting emulsion 2-3 times with an interval of 6-7 days.

7. Mustard solution

In 10 liters of hot water, 1-2 tablespoons are mixed. dry mustard. The cooled solution is good for both spraying and watering.

8. Ash + soap

In 10 liters of heated (30-40 ° C) water, stir 1 kg of ash. The solution is insisted, stirring regularly, for about 3-7 days. After that, the liquid component (without ash suspension) is poured into a clean bucket, a little liquid soap is added, poured into a spray bottle and processed. Spray the plants every day or every other day 3 times. Add 10 liters of water to a bucket with ash particles that have sunk to the bottom, stir and use it for irrigation.

And I also liked the advice from Tatyana Borovitskaya:
Furacillin, 10 tbl, crush, dissolve in hot water, bring the volume to 5 l and spray the plants and the ground. If gray rot has settled, it will crawl onto strawberries, onions, garlic ... Therefore, sprinkle everything in a row, over the soil and plants. Harmless and very effective! Good luck! 😊

Abundantly blooming petunia in the summer is a bright and eye-pleasing decoration of gardens, terraces, balconies. She is unpretentious and caring for her is not particularly difficult. However, the flower has a worst enemy -.

An experienced grower can easily determine that a plant is infected:

• white bloom appears on the leaves. These are fungal spores (mycelium). At first, the plaque looks like a cobweb, then like dust or powdered sugar;
• if you enlarge the affected areas, small sores will be visible;
• after maturation of the spores, tiny drops of liquid appear.

Powdery mildew affects the leaves on both sides. At first, you can ignore the plaque, and even erase it, mistaking it for dust. But over time, it will reappear in greater numbers, quickly capturing the entire plant.

How can a petunia get infected?

Conditions under which active reproduction of spores begins:

• the weather is not very suitable outside - the air temperature is not higher than 18-20 degrees with a humidity of 60% or more. Most often this happens when it rains for a long time. For flowers grown at home, weather conditions are not critical;
• sudden changes in temperature and humidity;
• excessive content of nitrogen-containing substances in the soil;
• plants are poorly ventilated. This usually happens if they are planted too densely. thinning required;
• the bush was subjected to radical rejuvenation;
• the rules of irrigation were grossly violated, when the soil that was not yet dry was abundantly poured, or vice versa, they waited for the earthen clod to dry completely.

Important! If petunia is grown at home, then no more than 3 plants should be planted on a pallet 1 m long. Otherwise, as they grow, they will choke each other, which means that the probability of defeat will also increase. In open ground, the minimum distance for small-flowered varieties should be 18-29 cm, for large-flowered varieties - 23-25 ​​cm.

Other routes of infection:

• a diseased plant was next to a healthy one;
• petunia was poured with contaminated water;
• the flower was touched with hands, gloves, tools that had previously been used to treat a diseased flower;
• mycelium spores were carried from infected plants to healthy ones by wind.

Why is powdery mildew dangerous?

Within 2-3 days after infection, the plant withers, loses its appearance, and then begins to rot. If urgent measures are not taken, the petunia will die in one and a half to two weeks.

How does the fungus work?

1. Absorbs nutrients from cells.
2. With the loss of important elements, the process of photosynthesis slows down, and then completely stops.
3. Atrophy of the leaves begins, and then the entire bush is affected.

Signs of the onset of the disease

The disease develops in several stages:

1. Leaflets that are closest to the ground are affected. They have white spots on them.
2. Infected leaves turn yellow, wither and fall off in 2-3 days. The newly appeared leaves have a twisted, unhealthy appearance.
3. For 5-10 days, fungi pass to the whole plant, including flower stalks. Petunia looks like it was completely doused with lime.

What to process during treatment?

You need to act like this:

1. If possible, isolate the diseased flower from its neighbors.
2. Cut off all diseased leaves and flower stalks to the maximum. They must be burned so that the infection does not spread.
3. The spores of the fungus are in the upper layer of the soil, so it must be replaced (or treated with a fungicide) and sprinkled with wood ash with a layer of 2 cm. It is best to transplant an indoor flower into a container with a fresh substrate.
4. Further disinfection will depend on the degree of infection. Can choose .
5. After processing, the petunia is taken out to sunlight. Until she finally recovers, fertilizing with nitrogen fertilizers is prohibited.

Important! Pots, pallets and the place where the indoor flower stood should be thoroughly washed and treated with a solution of potassium permanganate.

Biologicals

These remedies are used when the disease is at an early stage. Bacteria are used, which are formed during the fermentation of rotten hay and manure.

Suitable drugs:

1. "Pseudobacterin".
2. Alirin-B.
3. "Fitosporin".

You need to know that these drugs are more suitable for the prevention of the disease than for effective treatment. In any case, the bushes must be sprayed abundantly so that the product gets on all parts of the bush, as well as on the soil.

Chemicals

Suitable for quickly and effectively eliminating the fungus, especially if it has spread to a large area of ​​planted petunias.

1. "Topaz". Very effective, 3 treatments are allowed with an interval of 3 days, but recovery usually occurs after the first. 2 ml of the product is diluted in 10 liters of water.
2. Fundazol. The solution is prepared in a ratio of 10 g per 10 liters of water. 2 treatments are allowed.
3. "Vectra". 2-3 ml are diluted in 10 liters of water. Repeated spraying is possible no earlier than 10 days later.
4. "Speed". The drug is named so not by chance, it begins to act within 2 hours after spraying. Proportions - 2 ml per 10 liters of water. 3 treatments are possible with an interval of 8-10 days.
5. "Topsin-M". Available in emulsion or powder. Simultaneously with the therapeutic effect, the agent enhances the growth of flower cells by stimulating the process of photosynthesis. However, its disadvantage is the adaptation of the fungus to the active substance. Therefore, the tool is used, alternating with other fungicides. 10-15g of the drug is dissolved in 10 liters of water. Spraying is carried out if the weather is calm and clear. Re-treatment is possible after 2 weeks.
6. colloidal sulfur. For 10 liters of water is 40-50g. The air temperature should be within 20-32 degrees, otherwise the treatment will be ineffective.

Attention! Small flowerpots with a flower can be completely dipped in a healing solution. In this case, both the plant itself and the soil are well processed.

How to get rid of folk remedies?

They should be used in the first 3-4 days after infection. Then the efforts will be crowned with success.

1. Heat 5 liters of water to 40 degrees, add 200 g of wood ash and 30 g of liquid soap. Stir, leave for half an hour. Spray flowers at intervals of 2 days. In the remaining solution, you can add another 3-4 liters of water and pour into the wells.
2. Dilute 50 g of liquid soap in 5 liters of hot water, 5 g of copper sulfate - in 300 ml of warm water. Mix both solutions. Spray the plants three times, taking breaks for a week.
3. Dilute 2-3 tablespoons in 5 liters of hot water. and 1 tbsp. soap. Cool the mixture, process the petunia 2 times with a break of 7 days.
4. Take 2 tbsp. dry mustard in 10 liters of filtered water. Bushes should be sprayed and watered.
5. 30 g of garlic or onion peel is poured into 1 liter of water, you can drip 7-10 drops of iodine. The mixture must be infused for a day, filtered.
6. Dissolve 3g of potassium permanganate in a bucket of water. Processing is carried out 3 times with a break of 5 days.
7. Pour fermented milk whey into water in a ratio of 1:10. The serum forms a thin film that will prevent air from entering and stop the development of fungi.
8. For 3 glasses of water, a glass of milk and 1 tsp is taken. salt. It is necessary to spray with caution, there is a risk of burning the leaves.
9. For 5 liters of hot water, 10 tablets of furacilin are taken.
10. Fill the mullein with water. The proportion is 1:3. After 2 days, dilute in a ratio of 1:10 and process the flowers. The procedure is performed in a cool time to avoid burns on the flower.
11. 100 g of horsetail pour 1 liter of water, wait a day. Boil the mixture for 2 hours, strain and cool. Dilute with water in a ratio of 1:5 and spray the bushes.

Interesting! Farmers abroad, who produce organic products, choose mainly dairy products to eliminate powdery mildew.

What to do for prevention?

You can grow hybrids that are resistant to mycelium. But if you grossly violate the rules of care, even genetic immunity will not help.

Preventive measures:

• weekly it is necessary to inspect the leaves and stems, pay special attention to the area near the roots;
• plants need to be thinned from time to time and remove leaves in contact with the ground;
• need periodic disinfection with biofungicides or folk remedies, disinfection of tools and gloves;
• in order to develop immune functions, the plant should be fed with potassium-phosphorus mixtures;
• water for irrigation should be infused and be at room temperature. Petunia should be watered after the top layer of soil dries out.

Video

This video will help you better understand the problem:

Petunia, a beautifully flowering plant, delights the eye in summer in gardens and adorns balconies. Like all plants, it requires a little attention and care, and then it blooms profusely. However, often, no matter how you care for a flowering plant, diseases affect petunia, including powdery mildew. Powdery mildew on petunias, as it looks - outwardly it looks like a whitish coating on the leaves, similar to white powder, in reality it is a fungal disease that, starting from the leaves, can affect the entire plant. Old leaves die off, traces of the disease are visible on young leaves. Without treatment, there is a risk of destroying the plant, so you need to get rid of the fungus faster.

Powdery mildew on petunias

Favorable conditions for reproduction are high humidity, 60-80% and cool air - not higher than 18-20ºС. Under such conditions, petunia growing in the garden or on the balcony can be affected by powdery mildew.

Other causes of the disease:

• an excess of nitrogen in the soil;
• frequent and sharp temperature fluctuations;
• very dense landing;
• irregular watering - either excessive, or the plant is watered only when the soil is very dry.

Spores can be transmitted from a diseased plant to a healthy one through the air, carried by the wind from diseased bushes. A person can also become a source of infection if he touched an infected bush, and then a healthy one.

Video “Diseases of petunias. Powdery mildew on petunias

petunia treatment

Treatment should be started as soon as signs of infection are noticed. In a few days, the disease can cover the entire bush, spread to neighboring ones. To combat harmful fungus:

1. All leaves and shoots affected by powdery mildew are removed, even if the lesion is very small.
2. Remove the entire top layer of soil under the diseased bush.
3. Add soil treated with fungicide.
4. Spray the whole plant with special preparations.

The best fungicides for controlling powdery mildew are:

• "Topaz";
• "Vectra".

These two drugs are designed and directed specifically against powdery mildew on plants. The following fungicides will also help in the fight against the disease:

• "Fundazol";
• "Skor";
• "Vitaros";
• "Topsin-M".

"Fitosporin" is often used to prevent the disease in petunias, in the fight against the disease it is ineffective.

The second way to destroy pathogenic fungi is bacteriological, in the early stages of the development of the disease, bacteria that form during the fermentation of manure and overripe hay effectively fight it.

Folk remedies for the fight against powdery mildew

The recipes recommended by flower growers are more effective when the disease has just begun to affect the flowering petunia. Their use does not mean that it is not necessary to remove the affected leaves and trunks. After removing them, you can use the following spraying agents:

Table "Treatment of powdery mildew on petunias with folk remedies"

Helps well in the fight against powdery mildew and as a disease prevention a solution of fermented milk whey, taken in a ratio of 1:10. A thin film is formed on the plant, which reduces the air supply to the plant and stops the development of pathogenic fungus.

An unusual but simple way to deal with powdery mildew on petunias: 1 tbsp. milk, 3 tbsp. water, 1 teaspoon of salt. Mix everything and spray the plant, but be careful not to burn the leaves.

- pour water 1:3, after a couple of days, when it is infused, dilute 1:10 and spray the petunia bushes. It is recommended to do this during cool hours so that the plant does not get burned.

Another recipe for spraying a diseased plant: Dissolve 10 tablets of furacillin in 5 liters of hot water.

Infection prevention

Any disease is best prevented. In relation to plants, this is also important, therefore, in order to prevent powdery mildew disease of petunias, it is recommended not to plant petunia bushes close to each other, to observe the irrigation regime.

1. For prevention, a solution of ash and soap is used. The ash must be infused for a week in water (1:10), then drained, add soap to the water (2 tablespoons per bucket of water), spray the petunia bush, and add the ash to the soil.
2. An infusion of onion peel is used before the petunia begins to bloom in the fall: 200 g of husk is taken in a bucket of boiling water, insisted for 2 days, the plant is sprayed, after filtering the infusion.

It should be noted that such remedies are good for preventing the disease, but if powdery mildew on petunias has affected the plant, and folk advice does not help get rid of it, it is recommended to use chemicals.

Petunias, due to their beauty, are very popular with gardeners. They are grown to decorate balconies, terraces and ground flower beds. Even with perfect flower bed care, the risk of powdery mildew cannot be completely ruled out. Let's try to figure out what kind of disease it is and how to deal with it.

Causes of the disease

Powdery mildew is a fungal disease, the pathogens of which live in the upper layers of the soil. With proper care, plants are rarely affected, but if the gardener makes at least one mistake, the disease will not keep you waiting. Remember that powdery mildew spores are activated under conditions:

• cool damp air (temperature 15-20°C, humidity 70-80%);
• excess nitrogen in the soil;
• thickening of plantings;
• irrigation failure.

Powdery mildew on petunia leaves

In addition to pathogens living in the soil, the plant can be infected with powdery mildew from the outside. Very often, the disease enters flower beds from neighboring trees or vegetable crops that were previously infected. Also, spores can enter the flower garden through water. And in some cases, the gardener himself, without noticing it, can become a carrier if, before working in the flower bed, he was engaged in pruning infected plants.

Important! Treat equipment and hands after working with infected plants, otherwise the risk of damaging healthy plants increases many times over.

Recognizing an infected plant is not so difficult. At an early stage, the disease looks like a whitish coating, this is especially noticeable on petunia inflorescences. With further development, small drops similar to dew can be found on the petals and stems. The disease progresses from the lower leaves, but becomes noticeable only when it envelops the entire stem to the very buds. The consequence of the disease is rotting and death of the plant.

Plant treatment should begin as soon as the first signs of powdery mildew damage are noticed.

Powdery mildew spraying

To treat petunias for powdery mildew, follow the algorithm:

1. Remove all infected areas. This applies to buds, as well as yellowed and lost turgor leaves.
2. Remove the top layer of soil and replace it with treated soil.
3. Spray with a special preparation (foundazol, topaz, etc.).
4. Make sure the solution covers the entire plant.
5. For greater effect, you can dip the plant in a container with a prepared solution.

As you know, the best way to deal with powdery mildew is to comply with the rules of agricultural technology. Do not allow waterlogging of the soil and thickening of plantings. Proper care will not eliminate the possibility of infection, but will reduce the risk of disease by 90%.

Keep the plant watered - this will reduce the risk of infection

Folk recipes for fighting

Folk remedies for controlling powdery mildew are more effective for prevention, sometimes such methods are turned to in the early stages of infection. The most effective methods are:

With late detection (more than 5 days from the moment of infection), such methods are likely to not bring the desired results, in which case it's time to turn to "heavy artillery".

Treatment of the disease with chemicals

The most effective preparations used in the fight against powdery mildew are those containing a fungicide. It destroys the structure of the fungus and inhibits its development in plant cells.

If the disease has spread over large areas, you can not do without chemicals

The most effective drugs are:

• Fundazol;
• Amistar extra;
• Speed;
• Topaz;
• Previkur.

Advice! For antifungal measures, Fitosporin can be used. Against a progressive disease, it is useless, but ideal for preventive work.

Remember that it is better to prevent a disease than to fight it. Prevent the progression of the disease and get rid of pathogens in the early stages. A trained gardener is not afraid of powdery mildew. He knows exactly how to deal with her.

Petunia (lat. Petunia) is an unpretentious plant, and quite resistant to diseases. At home, the flower grows at high temperature and humidity, so growing it in the open ground of the Moscow region and central Russia can weaken it and make it susceptible to diseases.

If the leaves begin to dry, the color falls off, or the petunia withered - diseases and pests are most often the cause. Poor care and improper use of fertilizers cause the appearance and development of fungi. In some cases, they are introduced with low quality seedlings.

Powdery mildew of petunias (lat. Erysiphaceae)

Powdery mildew is caused by a fungus that infects flower stalks, leaves and stems in the form of white spots covered with spores. The vital activity of the fungus interferes with the photosynthesis of the plant, as a result of which the leaf plates curl and die.

Causes of petunia disease

• a sharp temperature drop;
• lack of sunlight;
• excess nitrogen and moisture.

Prevention and treatment of petunia disease

When a diseased plant is found, it is dug up, burned away from the garden, the top layer of soil under diseased plants is removed. Healthy petunias are treated with Topaz, Bravo or Fast.

Many diseases of petunia can be prevented, and their treatment will not be needed at all, or light organic remedies will suffice. To protect the crop from powdery mildew, plant beds are thinned out to provide good access to sunlight and air ventilation. Reduce the dose of nitrogenous fertilizers. For prevention in the spring, before planting in open ground, the ground is disinfected with foundationazole.

Gray rot (lat. Botrytis cinerea)

Gray rot is a disease caused by a soil fungus that enters through damage to the root or ground part. The defeat of peduncles occurs through the pistil.

Sign of defeat: the formation of spore-bearing fluffy gray spots. The disease develops rapidly at any stage of growth from seedling to the moment of emergence of seeds and can kill petunias in 3 days.

Causes of infection

• excessive application of nitrogenous fertilizing;
• soil and air humidity above 80%;
• lack of sunlight.

With moderate watering and temperatures above 25 degrees Celsius, gray rot does not develop. The fungus survives on plant debris and overwinters on the wooden floors of greenhouses.

Prevention and treatment

Careful inspection, cleaning of rotten and fallen buds and foliage. The introduction of nitrogenous dressings reduces the rate of development of the fungus or stops altogether, while potassium and phosphorus, on the contrary, increase.

Sick plants are immediately dug up and burned, the rest are treated with Topaz, Maxim, Trichodermin, Ordan, or Skor. Profit, Ridomil and Fitosporin have also proven themselves well.

Black rot of petunias (lat. Guignardia bidwellii)

Signs of infection with black rot: visually, the petunia resembles a burnt stick, the stem in the basal part becomes soft, easily separated from the root collar and removed from the ground. The leaf plates begin to curl, turn yellow and become hard to the touch. The disease spreads rapidly from sick individuals to healthy ones.

Causes of the disease

• dense landing;
• high air humidity;
• excessive soil moisture;
• Soil pH is above normal.

Black rot can affect petunia even at the seedling stage.

Prevention and treatment of the disease

Both viral and fungal diseases of petunias spread through seedlings, and the fight against them begins with the obligatory dressing of seed material and the treatment of planting containers with a weak solution of manganese or copper sulfate. If land from the garden is used for planting, then it is first steamed and treated with biological preparations with antagonist microorganisms (Trichodermin, Fitosporin, Agat25-K).

Petunias need regular thinning and watering of seedlings, planting seedlings in soils with a neutral pH (optimal 5.5-7). It is possible to preliminary reduce the increased acidity of the soil with lime.

At the first signs of the disease, treatment with Bordeaux liquid, potassium permanganate, Ridomil MC, Maxim or other preparations containing mancozeb, metalaxyl or oxadicyl is needed. A good result is shown by Trichodermin and Fitofosporin.

As a preventive measure, the soil is watered with sulfur-containing preparations (Cumulus, Sulfur May colloid, Thiovit jed). From organic methods, you can use an infusion of onion peel or marigolds (20 g of flowers per 1 liter of water).

Late blight (lat. Phytophthora infestans)

The disease manifests itself on the basal part of the stem, which becomes dark and begins to rot. The plant wilts and dies over time.

Causes of infection of petunias

• a sharp temperature drop;
• lots of night dew.

Often coincides with late blight of tomatoes and potatoes.

Methods of protection and treatment

As a treatment and preventive measure, petunia is treated with Ridomil, Profit, or any copper-containing drug according to the instructions.

Brown spotting of petunias (lat. Phyllosticta petuniae Sp.)

A characteristic sign of the disease is the appearance on the front side of the leaves of dark brown spots of a round shape, which over time changes to an elongated, oblong, with clearly visible concentric color zones. Light areas of the leaf become covered with a fungus and begin to secrete spores. A diseased plant gradually dries and fades.

The cause of infection is excessive moisture. Therefore, watering should be moderate, and rainwater and runoff should be drained or diverted.

Prevention and treatment of petunias, diseases and their control

Immediately after the discovery of brown spotting, diseased leaves must be removed, fallen ones must be collected and burned away from the front garden.

For treatment and prophylactic purposes, plants are treated with copper-containing preparations twice a week with a break of 10 days. The best preparations for treating petunias from brown spotting: Oxycom, copper oxychloride, Kartocide.

Diseases of petunias and the fight against them video

Outcome

If your plant suddenly begins to wilt, you need to act quickly to help it fight off the infection. The most common petunia diseases and their treatment with photos of the symptoms of infection, which we reviewed in the article, will help determine why the flower does not feel well, and tell you how to protect other crops from the spread of the disease.