Diseases of petunia - why do the leaves turn yellow?

Diseases of petunia can have different manifestations and arise for different reasons. You can fight many of them with the simplest methods and means. Then the plant will bloom luxuriantly and delight the eye with lush green leaves.

Diseases of petunia and their treatment

To decorate the space along the garden path, many gardeners plant petunias. The green bushes bloom beautifully and are easy to care for. But often the plant is affected by diverse diseases and pests.

Petunias in the garden

The list of problems is significant, which baffles inexperienced florists. If you identify the main problem of the trouble, then the solution will appear by itself.

Why petunia leaves turn yellow: what to do

A flower planted in a street flower bed or in a planter often suffers from negative climatic conditions or external factors. There are several reasons why petunia leaves turn yellow, and what to do about it to restore normal condition:

• lack of lighting can lead to discoloration of the leaves and their wilting. You need to put the flowerpot in an open area. For planting, you should also choose open areas;
• a yellow leaf can be a sign of aphids. It is necessary to treat the aerial part of the plant with a special agent;
• if the upper leaves turn yellow, then the soil lacks nutrients. It is imperative to apply fertilizer.

Yellow leaves

There are several more options for why petunia turns yellow, but they are associated with specific plant diseases.

Why petunia does not bloom

Petunia is appreciated by flower growers for its lush and long flowering, which adorns any flower bed. Sometimes the bush reaches the desired size, but no flowers are observed, then you need to diagnose the problem, and there may be several of them.

Reasons why petunia does not bloom during the growing season:

• wrong temperature conditions. If cold nights or several days of rains are foreseen, then it is better to cover the bush with a plastic cap. During the heat, you can equip a small shade;
• new flowers may not bloom if already withered or dried buds are not removed in a timely manner. The cleaning process takes a long time, but it will definitely ensure good flowering;
• improper feeding can also affect the flowering of petunias: the buds will not form under the influence of many trace elements.

Non-flowering specimens

Why does petunia dry and what to do

A flower can dry out for several reasons:

• excess (in cold weather) or lack of moisture (in hot weather);
• often flowers of this format are planted in pots and placed in the house, on the balcony. Lack of fresh air is the cause of the disease;
• using hard water for irrigation;
• sudden changes in temperature.

Gradual drying

Diverse diseases and pests can lead to damage to the root system and, as a result, drying out of the stem.The only solution in this case is to transplant the flower into a new planter.

Why petunias have sticky leaves: what to do

Some varieties have excessive leaf stickiness, which does not pose a threat. But there are other reasons why petunias have sticky leaves, what to do with it needs to be addressed immediately. If brown or gray spots are present under the leaves, then the plant is affected by aphids. Immediately you need to spray the bush with a means to combat this type of pest.

Aphids on a flower

Why petunia dries up, and how to save a flower

Rotting of the root system or gray rot can be the reason for the complete drying of the plant. There is only one way to reanimate a flower - to transplant the bush to another place, a pot, a flowerpot, after cutting off the damaged root processes.

How does chlorosis of petunia manifest?

This disease is very dangerous and requires immediate elimination. Iron chlorosis of petunia manifests itself as follows:

• the leaves themselves turn yellow, but the veins remain green;
• the edges of the plates are curled inward;
• all parts of the aboveground part change shape and size.

Manifestation of chlorosis

If chlorosis is not treated, the plant will die. The most effective way to combat is transplanting into new soil or fertilizing with fertilizers, which include iron.

Powdery mildew on petunia: how to fight

There can be several sources of infection: spores from the upper soil layers, contaminated water, diseased plants nearby. The disease is activated quickly. Powdery mildew appears on petunia as follows:

• a fluffy bloom that resembles flour;
• during the period of exacerbation, cloudy droplets of liquid resembling dew are formed on the leaves;
• then a light bloom turns into a dense white crust.

Powdery mildew

If you do not treat the plant for powdery mildew, then the bush will rot. First, you need to remove the heavily damaged parts of the aboveground part, the topsoil, then spray with a special agent.

Fusarium petunia

Such a disease is provoked by the blockage of the vessels of the plant with a toxic fungus. Fusarium symptoms have the following description:

• first, the lower part of the bush turns yellow;
• then the stem fades;
• the next stage is decay.

As a result, metabolic processes and the principle of development of seeds, plants, buds are disrupted. Fusarium disease requires complex treatment: soil change, spraying with medicinal products, watering.

Common causes of disease

Any disease of petunia is the result of not only improper care, but also negative external influences. The most common causes of disease are:

• violation of the temperature regime;
• wrong watering regime;
• lack of iron in the soil.

Healthy examples of flowers

So that the plant does not undergo various types of diseases, you need to know the basic rules for caring for a flower.

Temperature violation

The plant will not be able to bloom if the temperature is violated. The ideal interval for normal flower development is 20 ° C to 30 ° C.

If the weather is rainy and cloudy all summer, then the greens of the bush will brighten, and the buds will not form at all. When the summer is too hot, the flowers will dry out and fall off at the very beginning.

Violation of watering rules

If the bush begins to change color, shape, or fade, it means that you need to adjust the watering regime. The first sign of improper irrigation is yellowing of the aboveground part. What not to do:

• use ice or cold water for irrigation. It is advisable to use only settled;
• fill the flower with water if the top layer of the soil has not yet dried out. After irrigation, it is imperative to loosen the top layer of the earth;
• young seedlings will die immediately if poured from a bucket, it is better to spray.

Watering rules

Watering becomes easy when you consider these three basic anti-rules.

Lack of iron

If the colors of the bush become dull, then it is imperative to add iron to the soil. Such an element is vital for petunias. You need to feed the flower by spraying or watering.

Diseases associated with excess moisture

It is not difficult to grow a flower if you adjust the watering regime. Then there will be no problems with diseases that are associated with excess moisture:

• decay of the root system;
• from an excess of moisture, petunia leaves turn yellow;
• the bush begins to fade and shed buds and leaves.

Diseases due to watering

By adjusting watering, you can get rid of negative manifestations.

Prevention and remedies for diseases

Diseases of petunia and the fight against them are determined by the rules of care and growth. In order not to provoke the development of diseases, it is necessary to take preventive measures. You can make a pest control agent yourself, folk recipes are quite effective.

How to treat with folk remedies

Funds do not have to be bought in specialized stores, you can use handy products. You can fight diseases with the help of folk remedies:

• infusion of garlic (dissolve 20 g of garlic in 1 liter of water), which you need to spray the bush. He will save from various pests;
• soda ash (20 g) + dishwashing detergent (5 g) + water (5 l). Process the soil and bush with the resulting composition;
• mustard powder (20 g) + 5 liters of water. The agent is sprayed onto the plant with a spray bottle.

Alternative folk remedy for pests

There are a huge number of similar recipes that differ in effectiveness and method of application.

Prevention and protection of petunias from pests and diseases

The plant attracts many pests with its aroma and soft texture of the aboveground part of the bush. The most popular petunia pests:

• aphid that deforms the leaves;
• a whitefly that completely devours a bush;
• spider mite entangling the stem of the plant;
• thrips leaving gray streaks on green plates.

Pests are especially often attacked by specimens that grow in open ground. Therefore, the principles of control and prevention are determined by specific actions. It is necessary to properly irrigate, organize a normal temperature regime and make periodic feeding.

Correct care

Before planting on a flower bed, it is imperative to disinfect the soil, be sure to apply fertilizers in certain quantities. A properly selected landing site is a guarantor of normal growth and development. You also need to arrange good lighting. It is advisable to trim the excess processes.

A failure streak for florists is a deterioration in flowers that have taken so long to look after. It is especially offensive when you are waiting for a beautiful bloom of petunias, on which so many hopes are pinned, but it does not happen. Immediately you need to look for the cause of the disease or the appearance of pests, and then start treatment.