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It is believed that a flower in the form of a bush, panicle hydrangea has a strong immune system. However, in the absence of proper care, contact with contaminated equipment may cause the plant to wither. Among the diseases of hydrangea paniculata, those that provoke pathogenic fungi and viral bacteria stand out. Also, culture suffers from disturbed metabolic processes. A gardener who grows an Endless Summer (this is another name for a flower) in himself must be able to determine by appearance what ailment is destroying the plant. The sooner the fight against the disease begins, the more effective the treatment will be.
Ailments of culture
A flower with lush inflorescences can pick up various diseases. Each of them has its own characteristics and manifestations. Among the diseases of culture are the following:
- Ring spot virus;
- White spot (septoria);
- Rust;
- Gray rot;
- White rot;
- Iron chlorosis.
Ring spot virus
This is a dangerous disease for panicle hydrangea. Ring spot belongs to the category of viral ailments. It appears in the first half of the warm season. The main signal is patterned dark brown or black-red spots that grow on infected leaf blades. At first, the spots are tiny in size and resemble dots, but very quickly they grow and acquire a rounded shape with a depressed area in the middle. The leaves are curled, the shrub looks unnaturally curly.
The ring spot virus is most often picked up by the plant through contaminated soil or garden tools.
White spot (septoria)
The disease refers to fungal infections. In appearance, it looks a bit like a ring spot. Dark spots are found on the leaves. Their color can be:
- brown;
- red;
- brick.
Unlike viral spotting, fungal spots do not take on a circular shape. They grow chaotically, and dark areas fill the entire sheet.
Rust
Fungal disease caused by too frequent planting when there is not enough space for shrubs. In addition, the abundance of nitrogen in the earth provokes the disease. Rust is the answer to the question "why do hydrangea leaves turn red?" A sign of ailment is a red coating on the leaves. Rusty areas may appear pink at first and darken over time.
Gray and white rot
Both ailments are fungal in nature. Gray rot envelops shoots and stems. They become very soft, become blurry like jelly. Leaf plates, flowers are covered with a bloom similar to ash.If the weather is dry, then weak spots are noticeable on the stems, leaves, petals, which begin to turn pink, after which they acquire a red-brown tint, may turn red and dry out.
White rot affects the root system. Nutrition from the soil cannot penetrate the crop. As a result, the shrub is enveloped with whitish bloom and rot.
Iron chlorosis
This ailment is one of the safest. It is neither fungal nor viral. It can affect both paniculate hydrangea and large-leaved and tree-like shrubs.
Chlorosis occurs due to a violation of metabolic processes in the plant. In this case, chlorophyll, which should form in the leaf plates, stops doing this. As a result, the leaves lose their natural color. They fade and turn light green yellow. At the same time, the veins do not change color and remain bright emerald. Agronomists know that metabolic disorders are caused by insufficient iron content in the soil. The plant is not saturated with the element and begins to suffer.
Despite the rather safe nature, it is impossible to start the disease. The development of iron chlorosis leads to a weakening of the shrub, the absence of flowering buds, and a loss of decorative effect. Due to chlorosis, the culture can pick up more terrible diseases.
Treatment methods
Ring spot virus
It is useless to treat the redness and drying out of the shrub from annular spotting. Even a transplant won't help. Experienced gardeners are advised to dig up the crop and burn it. The soil in which the shrub grew is disinfected.
White spot (septoria)
Septoria hydrangea treatment implies a comprehensive treatment. First, all diseased parts of the culture are removed and burned. Further, the soil under the bush is disinfected. For this you can apply:
- Copper sulfate;
- Fitosporin;
- Bordeaux liquid;
- Baikal;
- Bleach (only in autumn).
In order to fight the pathogen and its vital activity, drugs are used:
- Captan;
- Profit;
- HOM;
- Abiga Peak;
- Oxyhom;
- Phthalan.
Rust
Why do hydrangea leaves turn red what to do? An effective measure in the fight against rust at the initial stage is the use of a nutrient solution Ferovit. It will help the plant cope with excess nitrogen and normalize metabolic processes. Spraying with a stimulant will not help in advanced cases. Here agronomists advise using the means:
- Raek;
- Speed;
- Falcon;
- Topaz.
Gray and white rot
In the early stages of the development of diseases, drugs show the effect:
- Fundazol;
- Topsin M;
- Pure color;
- Bayleton.
A folk remedy for fungi that causes rot is water with horsetail. Horsetail can be used both dry and fresh. For 5 liters of water, you need 500 g of fresh grass (or 100 g dry). Then the mixture is infused for 20-28 hours and filtered. The infusion is diluted with 20 liters of settled water. The product is used for spraying and watering.
Iron chlorosis
Processing is carried out in the form of spraying a shrub or watering the root zone.
For those who do not want to purchase a ready-made product, agronomists advise to prepare the nutrient solution on their own. To do this, you need a bowl of soft boiled water. There is placed 3 g of food citric acid and 1-2 g of iron sulfate (ferrous sulfate). Everything is thoroughly mixed. The cocktail is suitable for spraying a bush. However, self-prepared medicine is used in the early stages of the disease. For more effective treatment, it is better to use industrial products.
It is important for the gardener to be able to recognize the diseases that attack the Endless Summer. Diseases of hydrangea paniculata and the fight against them involve the use of fungicides. You can resist ailments and folk methods, but they are more often suitable for the initial stages of diseases.