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Many are confused when the spirea dries, as it is one of the most unpretentious garden crops that does not require special attention. The shrub winters well without shelter in the conditions of central Russia and rarely gets sick. And yet, if the rules of agricultural technology are violated, the plant's immunity can weaken, as a result of which the plantings become vulnerable to diseases and pests. It is they, in most cases, that are the reason that the leaves of the spirea begin to dry and turn yellow.
Why do spirea leaves dry
There are a number of reasons why shoots and leaves of spirea begin to dry:
- Irregular and infrequent watering. The spirea has a rather shallow root system, which is why the shrub does not tolerate prolonged drought. On the other hand, planting should not be poured either - in this case, there is a great risk of root rot.
- Ignoring the timing of sanitary pruning. This, in general, does little harm to the development of spirea, but the decorative effect of the bush decreases, since the old shoots begin to dry out upon reaching the 4th year of life. This gives the shrub an unkempt look.
- Landing in the wrong ground. Spirea does not impose special requirements on the quality of the soil, but for the optimal development of the shrub, a number of conditions must still be observed. In particular, it is not recommended to plant the bush on heavy clay soils. A soil with a low acidity level is best suited for this.
- The presence of moles on the site that could damage the root system of the plant if the digs are too close to the plantings.
- Excess fertilizers, which are laid in the planting hole before planting the spirea, and the wrong location of the seedling in the soil mixture. The plant roots should not touch the fertilizer.
- The plant is too deeply buried when planting.
- Insufficient depth of the planting pit.
- Poor soil permeability, as a result of which water stagnates and causes rotting of the root system.
- Thickening of plantings.
- The close location of the anthill to the bush.
- Disease or damage to spirea by pests.
As you can see from this list, most often spiraea dries out due to non-observance of the basic rules for planting and caring for shrubs, and only 3 points out of 11 are represented by pests and diseases.
Diseases and pests of spirea
Of the pests, the following insects should be highlighted:
- rosaceous miner;
- rose leaf roll
- aphid;
- spider mite.
The multicolored miner affects the spirea in June-July, the rose leafworm in March. They quickly drain the bushes, causing the leaves to curl first and then dry out.
The following chemicals are commonly used to control these pests:
- Actellik;
- "Etaphos";
- Pirimor;
- Hostaquik;
- "Kronefos";
- Fozalon.
Aphid infestation occurs in the second half of the summer. In the fight against this pest, granulated "Pirimor" has proven itself well. You can also treat the spirea with the biological product "Bitoxibacillin" or infusion of garlic. To prepare such a tincture, pour about 200 g of chopped garlic with cold water and keep the resulting solution for 2 hours.
The spider mite appears on the leaves of the spirea in May, but it causes the main damage in July-August. The first sign of damage to plantings by this pest is the formation of thin cobwebs and whitish spots on the shoots.As a result of the activity of the pest, the leaves of the bush quickly turn yellow, dry and fall off.
Against spider mites, spirea is sprayed with the following insecticides:
- Phosphamide;
- "Karbofos";
- "Keltan";
- Fozalon;
- "Akreks".
You can also use folk remedies. For example, wood ash and laundry soap effectively repel ticks. To do this, pour ¼ bucket of ash with cold water and add about 3 tbsp. l. finely grated soap. The solution is infused for 2-3 days.
Spirea is very rare. The main threat is verticillosis, which causes the verticillium fungus. The first signs of the disease are wilting and yellowing of the leaves, which quickly begin to dry. First of all, the disease affects the lower leaves of the spirea. Increased soil moisture provokes the development of the fungus.
If the plant is damaged by verticill, it is necessary to spray the bush with "Fundazol" or a solution of potassium permanganate. You can also use a solution of copper sulfate.
Separately, it is worth noting such a reason for the drying out of the leaves of the spirea, as damage to the roots of the plant by moles. There are many ways to get rid of these pests, but it is best to use humane repelling methods:
- Installation of acoustic devices "Antikrot", "Krotogon" and the like. These devices emit ultrasound, disorienting moles, making the garden area unattractive to them.
- Burrowing empty plastic or glass bottles with the neck upwards into holes dug by moles. The wind blowing into the bottle begins to emit a humming sound that scares away moles.
- Arrangement of containers with castor oil on the site. The strong smell of the substance is unpleasant for rodents.
These methods do not lead to the death of animals and are quite simple.
Preventive measures
It is always better to prevent illness than to cure it. In order for the spirea not to begin to dry, it is enough to follow the most basic rules of agricultural technology:
- Plant in loose, low acid soils.
- Do not thicken the planting.
- Do not make the landing hole too deep. The recommended depth is 40-50 cm. In this case, it is advisable to ventilate the planting holes and plant the bushes only after 2-3 days.
- Water the spirea in a timely manner.
- Weed the trunk circle, as weeds are an ideal breeding ground for pests.
- Prune the bushes regularly.
- Do not bury the seedling too deeply. The root collar of the plant should be at ground level.
In addition, it will be useful to periodically spray the bushes with fungicides and insecticides. Preventive treatment should be applied not only to already planted plants, but also planting material.
If the clay content in the soil is too high, it is recommended to lay drainage at the bottom of the planting pit.
What to do if spirea leaves turn yellow
Premature yellowing of leaves is the most common cause of fungus. In this case, the spirea must be treated with any fungicide.
Conclusion
Spirea does not dry so often - in order for this to happen, a serious violation of the rules of agricultural technology is necessary. In rare cases, the plant dries up due to the fault of pests and diseases. Thus, it is very simple to avoid shrub drying out - you just need to study the peculiarities of planting this garden culture and properly care for it.
