Not only pests are dangerous for thuja. With improper care and watering, they can be subject to disease. It is worth considering the main ones: how they are characteristic, and how to cure your favorite trees from them.
Phytophthora
Phytophthora is considered the most famous and dangerous fungal disease of thuja. This is a root disease that destroys its top layer. This is reflected in the appearance of the thuja as follows: it fades, turns gray, Bottom part the trunk becomes soft to the touch. The tissue under the bark changes color to brown, and a plaque will appear below. The root becomes brittle, with a smell of rot.
Basically, phytophthora affects thuja growing on poorly drained land, the water often stagnates here.
Treatment
For the prevention of phytophthora, it is often necessary to water the thuja with fungicides. If the disease nevertheless got to it, and the roots festered, it is best to destroy the tree and replace the earth, since this fungus can live for a long time.
This is a fungal disease that appears in early spring. You can notice it by yellowed scales. In the late stage of development, the disease affects the entire shoot, and it dies.
How to overcome?
To protect the thuja from this disease, it is constantly fed, and the roots are sprinkled with limestone. In the period July-October until October, it is advisable to spray the thuja with Fundazol (2% solution) every 2 weeks. If you see at least one affected shoot, it should be cut out immediately, and then the disease will not spread further.
If the bark is covered with yellow ulcers, which gradually grow and increase, your tree has picked up a false shield. Treatment should be started immediately, otherwise this disease will cause spots to cover the entire trunk, and it will die.
What to treat?
In order to destroy the false shield, the following means are used: Rogor, Karbofos, Aktellik, Antio.
There are also folk methods. To prevent this disease, you can wrap the trunk with straw or burlap. At the same time, treat the branches with a soap solution on dinatured alcohol (15 grams of soap, 10 ml of alcohol and 1 liter of warm water). Another way is to apply special glue from caterpillars to the surface (this will keep pests out).
As soon as you notice just a few larvae, try to simply brush them off with a brush or knife without damaging the bark.
Shutte and rust
Fungal diseases, manifested by darkening and falling of needles. They begin in the spring and spread throughout the year. Mostly young trees are affected.
How to remove rust and shute? The best drugs for prevention
To stop the development of the disease, it is necessary to cut off all the affected branches and burn them to prevent its spread to others. coniferous trees. But this doesn't always help.
It is best to treat affected trees with HOM. The consumption rate of the drug is 40 g / 10 l of water. This solution should be sprayed on the affected trees twice a season: in spring (in May) and in summer when the disease reappears. Since both schütte and rust are characteristic of all conifers, it is worthwhile to carry out preventive treatment of the rest of the conifers (all, without exception). It is carried out with the same HOM in the same dose, but only once in the spring.
In the absence of effect, it is necessary to shed the trunk circles of the affected trees with Fundazol. The consumption rate of the drug is 20 g / 10 l of water - a solution (0.2%) will be obtained, which is used to shed the near-stem circle of the affected tree once during the growing season. No need to spray trees with it, only the soil to destroy the infection in it.
From Shutte, Topsin-M is also used: the consumption rate of the drug is 15 g / 10 l of water, this solution is consumed per 1 adult plant. Spraying is carried out once in the spring after the threat of night frost has passed.
Instead of HOM, you can purchase Bordeaux mixture. This is an old, but very effective and proven remedy, suitable for many cultures. It is not necessary to buy it.
homemade bordeaux mixture recipe
It's easy to cook it yourself. The purchased bag contains lime and copper sulfate. So, to prepare ten liters of a one percent solution, you need 100 g of lime and 100 g of vitriol.
Prepare it like this:
- Vitriol (copper sulfate) is diluted in glass or wooden dishes (in no case iron or plastic!) Up to five liters of water are added, in another container the same with lime;
- Diluted vitriol is carefully poured into slaked lime;
- Mixed. You should get a light blue liquid;
- To understand whether we poured in enough copper sulfate, we need to take an iron object not covered with rust (for example, a knife) and lower it to the bottom of our liquid. The appearance of a red plaque means bust;
- Fixing this is easy by adding lime. It is necessary to check, otherwise you can burn the plants.
With this working solution, preventive spraying can be carried out every spring (during the growth of new needles) at the rate of 10 l / 100 m².
Outcome
Proper Care And timely help will protect and cure your thuja from many possible diseases and pests. But it is also important to remember that the shedding and yellowing of the needles does not necessarily signal the appearance of some kind of disease.
Thuja often changes color and sheds needles at the end vegetative period. Appearance may indicate that it is dying. But in fact, it is just preparing for winter, and changing the color of the needles is just its defensive reaction.
You may be interested in information:
- thuja pests and methods of dealing with them;
There are many reasons why thuja can change its green color, as a result of which it crumbles and dies. It is difficult for a non-specialist to determine why the thuja turns yellow without special knowledge. Below we list the most common causes this problem and briefly about what to do about it.
Natural yellowing of needles
In the process of growing, this conifer has a natural yellowing process that occurs in the fall. In thuja, like most conifers, the life cycle of needles is from 3 to 6 years. After this period, they begin to lighten, losing chlorophyte substance, and as a result die. In their place, new needles grow - this is a normal process.
The change in color seasonally occurs in different ways, depending on the plant variety. Here, for example, western thuja or folded thuja acquire golden color with a bronze sheen winter time of the year.
Thuya Smaragd retains its saturated green color throughout the year.
The darkening of the color of the thuja needles is a kind of reaction to the coming cold and adaptation to them. After all, thuja comes from the West and North of America, where harsh winters prevail. In the spring, thuja resumes its rich green color. If this process does not occur, then the plant has serious problems. It is also worth considering the factor that with the onset of the new season, the sun becomes more active and can cause thuja burns, as a result of which it turns yellow.
Other reasons
Improper planting of a coniferous tree is the most common factor affecting the yellowing of the thuja, the shedding of its needles, the drying of the branches and the death of the plant.
Rules to be followed in the process of growing thuja:
- You can not plant a plant in sandy soil, in which moisture and nutrients very quickly go to the lower layers.
- You should not plant thuja in loamy soil, which is considered heavy and knocked down. The plant will suffer from a lack of oxygen, while the root system will not develop fully.
- Planting thuja in peat soil in the lowlands is also undesirable. In such a site, there may be stagnant water, as a result of which the plant may rot and die.
Thuja grows best in a well-drained mixture of soddy soil with the addition of sand and peat.
Illiterate care quite often becomes the reason why the thuja turns yellow, namely:
Diseases and pests of thuja
There are many pests that lead to the death of thuja. If animals often mark trees, then black plaque may appear on them. The urine of mammals can harm not only the thuja, but also other large trees.
Thuja can be affected by various diseases and pests. You can often observe the appearance of brown mold, especially after the snow melts in the spring. Thuja is covered with a grayish coating. In such a plant, young branches begin to die off intensively.
Quite often, mushrooms take root on the branches of the thuja, which destroy the top layer of wood. With such a disease, the needles first turn yellow, and then turn gray.
Over time, these spots merge, as a result of which the entire affected branch acquires a brown color. In order to make sure that this is a fungus, it is necessary to find the source of sporulation. It is a collection of black dots or tubercles of black or gray color, whose diameter is 1-2 mm. Excess moisture leads to the fact that the mycelium of the pathogen can form on the affected stems and trunk. It has a grayish black color.
Any change in the color of the thuja may be a sign that the plant is affected by stem rot. On such a plant, all trunks are carefully examined for the presence of pathogens of this disease - tinder fungi. They are attached to the trunk, have a dark brown color with furrows and vertical cracks. Their diameter can reach 18 cm.
There are many varieties of fungal infections of the needles, which lead to its withering, discoloration and drying out. The most common diseases are fusarium and late blight. A sign of their appearance is the softening of the bark in the lower part of the trunk. Around the trunk near the ground, a plaque forms with white or pink specks. The root system becomes very sensitive, fragile and brittle. The cause of these diseases is improper care and planting. Most often, plants planted on dense loamy soils with excess moisture are affected.
Click beetles or weevils are one of the most common pests of needles. Their larvae infect root system plants. Ideal conditions for their reproduction are acidic soil with an excess of moisture. What to do in this case?
Treatment of needles from necrosis and vascular wilt occurs by spraying with a solution Bordeaux mixture one percent concentration. Some gardeners use HOM or Abiga-peak preparations, which are very effective.
If the trees are badly damaged, the treatment is carried out repeatedly. To treat stem rot, all affected branches and areas are disinfected. In the presence of mechanical damage, plots are processed blue vitriol 1 percent concentration. Then the wounds are covered with garden pitch or oil paint. Shrunken trunks and branches are to be cut down.
It is sad to observe the appearance of brown, yellowed, covered with a grayish coating of evergreen thuja twigs. Why did the thuja turn yellow after the winter and what to do. The gardener or owner of the site on which the tree grows should be responsible for the manifestation of a disease state in spring or autumn period of the year. The article provides information about what could cause the thuja to turn yellow and how you can help the tree regain strength and restore its former beauty. It will help to get acquainted with the material in more detail video located at the end of the article.
Natural causes of yellowing thuja
The loss of decorativeness and yellowing of thuja branches occurs due to a number of reasons. This condition is typical for plants that do not receive proper care, a deficiency is formed in the soil. nutrients and there are problems with the root system. The plant may look unsightly when suffering from disease or pests, also Negative influence may have an incorrect landing of thuja in open ground.
Healthy ! In autumn, thuja needles may turn yellow for a natural reason - due to the loss of chlorophyll, which provides nutrition to the needles.
The needles turn yellow, dry up and die off, after which a new young needle appears in the same place. This process occurs with the plant every 3-6 years and is natural. life cycle thuja.
Tui has yellowing needles due to the natural protective reaction to a cold snap in the autumn, after which the branches become green again.
The article below provides a description of each reason why twigs thuja turned yellow after winter or at other times of the year. Information is also provided on the measures that need to be taken to save and restore the decorativeness of the plant.
Important! Despite the reason why the top of the thuja turned yellow, and the needles are dry, the affected areas should be cut out. It is necessary to remove only the dried needles of the plant, since the branches can still be covered with fresh greenery. It is not recommended to leave yellow needles on the plant, as this can lead to the death of the tree.
Causes, why did the thuja turn yellow and what to do
Recommendation! Every spring, prophylactic treatment of thuja with a growth stimulator should be carried out; Epin or Zircon can be used. Also, this procedure must be carried out if the plant has suffered from sun rays and got burned.
You can rid the plant of a fungal disease with the help of a foundation solution. To prepare it, you need to take the drug in a proportion of 10 g per 10 liters of water. The first time it is recommended to process the thuja immediately after planting. The procedure must be repeated further for preventive purposes.
Advice! If the branches are affected by the fungus, pruning of the shoot should be done 3 cm above the site of infection. After that, the cut must be treated with a 5% solution of copper sulfate.
- Newly planted arborvitae are at high risk of brown shutte infestation immediately after winter, when the snow melts. The disease is manifested by a change in the color of the needles to brown, subsequently the branches become covered with a gray-black coating. Therefore, in early spring, for preventive purposes, the plant should be treated with phytosporin.
Watch the video! Why does thuja dry in spring? What to do in this case?
Tui pests
- Some types of ticks that settle on the needles of a tree can only be seen with a magnifying glass. If red insects are visible on the shoots small size, then we can say with confidence that the plant is affected by mites. You can get rid of pests by spraying Fufanon or Actellik needles.
- needles in spring time years can acquire a reddish-brown hue and even be covered with a grayish bloom when it is attacked by sucking insects such as thuja aphid, thuja false scale, mealy worm, moth, moth, juniper scale insect.
In order to rid the plant of these pests, it is necessary to treat the thuja with karbofos in the spring.
Then in the summer, as a preventive measure, spray with Rogor or Actellik. For these purposes, "Abiga-Peak" is also suitable.
- Also, the plant may be susceptible to attacks by larvae of the deciduous leafworm, which provoke yellowing of the needles due to the fact that they form cocoons on the shoots.
- Caterpillars of the bagworm eat greens.
- Weevil beetles also cause significant damage to the plant, as they gnaw and damage the bark and needles of the thuja.
- The thuja beetle, similar to the spruce beetle, makes holes in tree trunks, which causes significant harm to the tree.
In order to get rid of these pests, the conifer should be sprayed in late spring - early summer. For the procedure, you will need drugs: "Fufanon", "Aktellik", "Confidor".
To carry out processing, which will destroy pests, should be 2-3 times a month, observing an interval of 1 week. Spraying is best done in the morning or evening. You should also be careful about safety measures during spraying. This operation should be carried out in a special protective suit and a mask with a carbon filter.
As a top dressing, you can use both homemade and purchased fertilizers. As organic feeding manure from cattle or bird droppings is used.
From manure, you can prepare a solution for treatment, while you need to dissolve 2 kg of manure in 10 liters of water, and then remove the resulting composition in a dark and warm place for 14 days. After that, the solution must be diluted with water again. It is recommended to water each tree with the resulting liquid, pouring the product under the very root
Conclusion
Yellowing of thuja needles can be due to several of the most serious reasons, such as: improper plant care, attacks by viruses and insects, a natural age reaction. The tips presented in the article will certainly help to cope with all the ailments from which the tree suffers.
Watch the video! Why does thuja turn yellow and how to save it?
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Tui look very impressive in landscape design but they need to be properly cared for. Very often, gardeners are faced with a problem, they ask the question: the thuja turned yellow after the winter, what should I do? Let's see what could be the reasons for the yellowing of the thuja crown, and how to deal with this scourge.
Sometimes the thuja becomes yellow inside. If you move apart the branches of the needles, you can see such yellowing. We can say that this is the norm, since the needles change every season. Old branches that are located inside the crown are aging. You should not touch the dried branches before winter, and in the spring you need to manually clean the thuja from such branches. It is better not to use a tool, otherwise you can damage the plant. And any microtrauma will lead to infection.
In autumn, some types of thuja can change the color of the crown of the plant to yellow-green, and sometimes to brown-green. Therefore, if your thuja has changed color, do not immediately panic. Perhaps you have a folded thuja or a western thuja growing in your garden. In the spring, when the snow melts, the soil thaws, and sap flow begins in the trunk and branches of the tree, the needles will turn green again. Many coniferous trees prefer to change color, this is a kind of protective reaction of trees from the spring sun. For needles, burns received in the spring can be fatal.
Yellowing needles can lead very coldy. If the winter is not snowy, and frosts reach 30 degrees, cracks form on the trunks, on this side the needles turn yellow. This is hard to insure. In regions with severe winters, it is better to cover the thuja every year, and not just the first year.
Other causes of crown yellowing
Thuja needles may turn yellow for the following reasons:
- Too much or too little fertilizer.
- Sunburn in the spring. Young thuja is very sensitive to the sun and weather changes.
- Too much or too little moisture in the soil. At in large numbers moisture, the top of the thuja turns yellow.
- Diseases and pests. Yellowing can be caused by false shield damage, as well as Fusarium disease.
Causes of blackening of thuja after winter
After frost, sometimes dark, almost black spots can be found on the thuja. There are two reasons for the problem:
- This may be due to a fungal infection. If there are few spots and they are small, you can limit yourself to treating the fungicide. It is carried out twice, taking a break of two weeks. Areas that the fungus has managed to hit must be removed. If a large part of the thuja is affected, the tree should be removed, otherwise it will infect the rest of the plantings.
- If black spots are concentrated on the lower level of the tree, pets that defecate on thuja are most likely to blame. If large areas of the tree are affected, the thuja will die, it must be removed.
How to return thuja green appearance
After finding out the reasons for the yellowing of the needles of the thuja, you need to proceed with the resuscitation of the plant.
Wrong fit
Why does thuja turn yellow after planting? Novice gardeners often make mistakes when planting thuja seedlings. It is necessary not to deepen the seedling too much, the root neck should remain at the level of the soil. When planting, you need to remember that after a few rains the soil will settle, and the tree will drop a little more.
If the thuja suddenly began to turn yellow, it is necessary to check how the landing site is chosen correctly. Perhaps the thuja grows in a damp place, or it is too dry. Drying out, as well as excessive moisture, can kill the plant.
With a lack of moisture, it is necessary to immediately water the plant, in addition, it is necessary to carry out spraying. In the event that the sun constantly hits the thuja, it needs to be shaded a little. After that you need proper watering, it is recommended to spray with Epin-extra.
What to do if there is stagnant water in the area? Drainage grooves can be dug to allow water to drain away from the planting hole. But this is possible if the slope of the site allows it. If it is not possible to arrange drainage grooves, they arrange raised beds on which thujas are transplanted.
Fertilizer shortage
- For the proper development of thuja, you need to maintain a balance of micro and macro elements. Yellowness can be caused by a lack of manganese, copper, potassium or nitrogen. If yellow areas are found on the needles, it is necessary to analyze all top dressings to determine whether all the elements are enough in these fertilizers.
- The leaves become pale green, the shoots stop growing, which means that the thuja lacks nitrogen. Violation of nitrogen metabolism can cause a lack of potassium. Ammonia accumulates in the crown, which leads to yellowing and further death of the shoots.
- With a lack of copper and iron, the process of photosynthesis is disrupted, the thuja needles lose their green color.
- Leaves may turn yellow due to chlorosis caused by a lack of manganese.
Diseases and pests
Many pests can cause thuja shoots to turn yellow. The plant is especially annoyed by thuja aphid and moth-moth. When the first signs of damage to the thuja are found, insecticides must be applied.
Schutte and tracheomycosis wilt sometimes lead to the death of trees. And it all starts with yellowing needles. Then it becomes gray and brown. It is necessary to destroy the plant, otherwise the spores of the fungus will spread to other plants. The soil should be treated with a fungicide.
For the prevention of fungal diseases, spraying with Bordeaux liquid should be carried out in the spring. With signs of the disease, spraying of the entire garden is carried out at intervals of 15-20 days.
Sunburn
If spring burning occurs, the needles turn brown. Beginning gardeners do not always immediately notice this. At first, the tops of the shoots just dry out a little. But in May, the seedlings become pronounced brown. It becomes clear that the thuja is burned. The spring sun is too bright, it begins to shine and warm when the roots of the arborvitae are still in the frozen soil. The plant does not receive enough nutrient juices, as a result, a burn occurs.
Even covering with spandbond, lutrasil can not always help. Sometimes such a shelter only harms, because due to lack of air, the shoots begin to rot. As a preventive measure, you should thoroughly shed the thuja in the fall. In spring, it is recommended to water the plant lightly warm water, not higher than 40 ° C, this will help wake up the roots of the plant.
After planting thuja in the garden you expect the tree to move into growth, begin to turn green, please the eye, but instead, the thuja turns yellow after planting, perhaps it also dries up in places. Why does thuja turn yellow after planting and what to do to revive it, you will learn in today's article. If the question remains relevant to you, keep reading.
Usually thuja turns yellow for natural reasons, for example, in the fall, preparing for a state of rest. Any novice florist understands that this is a completely normal process, but what can be said about the noticeable yellowing of the thuja after planting in the spring?
Various factors can affect the yellowing of thuja - acquired (improper care) or natural (changes in weather conditions).
Why does thuja turn yellow after planting:
- Absence/stagnation of moisture;
- Unsuitable soil mixture;
- Illiterate care;
- Changing weather conditions;
Moisture in the soil mixture is retained depending on the type of components that make up the substrate for planting. When planting thuja in open ground, you should follow certain rules:
It is best to plant thuja in a drained sod land, flavored with sand and peat in moderate volumes.
Why thuja turns yellow:
- Availability ground water , which lead to rotting of the roots and, as a result, disruption of the surface system.
- lack of hydration- drying of thuja.
- Cushioned landing, lack of moisture, air and nutrients for each tree.
- Excessive lighting and exposure to direct sunlight - a straw color is acquired, a noticeable partial yellowing in places of strong exposure to the sun.
- roadside thuja turn yellow from salts, components, cleaning agents.
- Nutrient deficiency- starvation against the background of insufficient feeding. In addition to yellowness, thuja acquires brown, purple hue on the edges of the leaves.
- Temperature drop or its jumps, the air temperature is below -20 ° C - browning and yellowing of parts of the arborvitae.
Thuja diseases: why does thuja turn yellow after planting
Pathogenic bacteria and fungi that destroy the root system and bark of the thuja also cause changes in the color of the branches.
Tui diseases:
- Brown Shutte (stormy snow mold);
- Necrosis (fungal disease);
- stem rot;
Brown Shutte settles on young thujas. The disease appears in the spring, as soon as the snow melts. Mycelium snow mold appears as a black coating, then pointwisely transferred to other branches. First of all, the thinnest shoots die off.
Necrosis of cortical tissue and branches begins due to damage by fungi. First, the lower branches change color, after which the yellowness spreads to the upper shoots. Sporulation in the form of dark dots or gray-black tubercles (1-2 mm in diameter) are localized on the bark. The mycelium spreads with an abundance of moisture.
The defeat of the thuja may be due to the appearance stem rot. In this case, any change in the color of the thuja for no apparent other reason may indicate the presence of a disease.
