Why do the leaves of the apple tree turn yellow.
Content:
EIf the leaves of the apple tree begin to lose their green color, and even at the wrong time, then this should be a signal for any summer resident growing an apple tree. This suggests that the tree is not entirely healthy, and it needs the necessary help. If this is not done in time, the tree may simply die. If the summer resident cannot correctly establish the reasons for this situation, then this can lead to the fact that you will lose time important for saving the tree. It is also important to know how to take preventive measures in order to avoid unpleasant situations.
Causes of yellowing of leaves in an apple tree.
In order not to think about what caused the yellowing of the leaves of the apple tree, it is necessary to take proper care of it. Namely: Choose the right landing site.
- Apply fertilizer and water the tree.
- To carry out preventive measures against various diseases and attacks of insect pests.
- Carry out work in the autumn so that the tree can transfer the winter season.
it is important to keep in mind that the yellowing process can also occur in different ways: from bottom to top or top to bottom, a change in shade occurs, the color can change simultaneously with curling or falling of the leaves. If you pay attention to different nuances, you can determine the exact cause of this phenomenon.
Why can the leaves start to turn yellow?
If the process of yellowing of the leaves began from the lower tier of the tree, then this may indicate an imbalance in the ground supply. For example, why leaves can start to turn yellow in summer. What mineral elements the tree lacks. Nitrogen deficiency. The leaves acquire a light green color, over time they acquire a yellow tint. The growth of young shoots becomes weak.
Potassium deficiency. On the border of the leaf, you can see the appearance of a red rim, which begins to dry out over time. If a tree is deficient in potassium, then it cannot receive nitrogen in the proper amount. Therefore, these two elements do not exist in tandem.
Lack of phosphorus. The leaf plate takes on a bronze or purple hue, after which the leaves begin to blacken and dry out.
Magnesium deficiency. This can occur if the tree grows in sandy soil, especially if the weather has been rainy for a long time. On the leaves, you can see the appearance of yellow, red, and later brown spots. The fruits and leaves of the apple tree begin to fall off.To avoid a deficiency of a particular element, it is very important to apply the necessary fertilizers on time and take proper care of the tree. If the leaves began to turn yellow starting from the top of the tree, then attention should be paid to soil moisture, which could arise due to abundant watering, while the tree has a poor drainage system or there is groundwater nearby.
Over-watering can cause moisture to stagnate, which can lead to root rot. It is best that this situation does not arise at all, since it will be quite problematic to fix it. What can be done to remedy the situation? Establish a soil drainage system.
Choose the right site for planting a tree.
Land on the shafts.
Yellowing of leaves in a young apple tree.
When the leaves of a young apple tree begin to turn yellow, this is a completely unpleasant moment. There may be several reasons for this phenomenon: If the groundwater is not deep, then yellowing of the leaves of an apple tree at the age of 3 years may begin.
If you think that fungus may be the cause, then you are not. Young apple trees are extremely rarely affected by fungal diseases. Lack of nitrogen can be the cause of yellow leaves.
If you notice that yellowing does not occur throughout the tree, but only on individual branches, while the edges of the leaf become brown, then it is important to apply potash fertilizer.
If the tree does not have enough sulfur and nitrogen, then the application of complex fertilization is best.
The weather is very hot.
Pest attack.
The presence of a fungal disease is very rare.
If there are spots, this may indicate the presence of pests such as scab and brown spot. The fact that there is a scab on the plant can be discerned with the onset of the spring months. Oily spots can be seen on the surface of the leaves, after which a velvet bloom appears, and the leaf blade acquires a brown tint and begins to dry out. In order to process a young apple tree, you can use Bordeaux liquid, as well as Skor and Fitosporin. Also, nitroammophoska has proven itself well. The substance box must be diluted in 10 liters of water. In advance, you need to water the tree abundantly, after which fertilizer is applied in the amount of 2-3 liters per tree.
Yellowing of leaves in seedlings.
If the leaves of the seedling turn yellow after a relatively short time after planting, the reason is most often the planting of the seedling too deep, or you have chosen the wrong place for planting. If the place was chosen incorrectly, then the root system of the plant begins to experience a lack of oxygen. The reason that the leaves of the seedlings began to turn yellow may also be the planting of a tree to a depth of 10-15 cm. Inappropriate soil composition may also be the reason. For example, if the soil is too alkaline due to a large amount of lime or fresh manure. At first, the leaves of the apple tree become pale yellow, and then completely begin to fall off. In addition to the above reasons, yellowing of the leaves may be associated with chlorosis. Also: The tree lacks iron salts, which are required for the normal synthesis of chlorophyll (green pigment).
The root system is frozen after the winter season.
As a result of waterlogging, a lack of oxygen was formed in the soil.
Yellowing in the springtime.
If the leaves of the apple tree began to turn yellow in the spring, then the reason for this phenomenon is an attack from the side of scab and brown spot. Immediately, the yellowing of young leaves begins and spots appear. Those leaves that have fallen must be collected and burned, and the tree must be treated with Bordeaux liquid. Also, yellowing in spring can be a deficiency or, on the contrary, an overabundance of a particular microelement.
Yellowing in the summer.
There are cases when yellowing of leaves occurs due to physiological disturbances in the life of trees. For example, if you planted the seedling too deep during planting, or the tree trunk froze over in winter. Also, the person himself can affect the violation of physiological functioning when she begins to cut some ropes or wire into the bark of a tree. Also, do not forget to remove the label and its attachment from the seedling. Also, a situation may occur that with the growth of the trunk, its plunge-in occurs. Minor damage can be repaired by furrowing, namely, making cuts in the bark up to the wood on the damage, and above and below it, in order to generate a process of callus build-up.Also, the reason for the yellowing of the leaves in the summer may lie in the physiological incompatibility of the scion and rootstock, which was a consequence of the fact that there was a poor-quality accretion of the grafted surfaces.
Common cases when leaves turn yellow.
Young apple tree and seedlings.
The main reasons are:
The seedling was planted incorrectly.
Incorrect soil composition.
The soil is waterlogged.
Fungal diseases.
The roots were frozen in winter.
Very often, the change in leaf color from green to yellow occurs as a result of a deficiency of boron, magnesium, phosphorus and potassium. When a tree is deficient in these elements, the process of dying off the ends of the shoots begins.
On one branch.
If the leaves began to turn yellow on only one branch, then this may indicate the presence of aphids on your tree. Another reason may be damage to the root system from mice or moles. Also, freezing of the roots and the lack of some elements can lead to yellowing of certain parts of the tree. But there is a big threat to the tree - it is disease bark, namely cytosporosis. First, one branch is affected, then half of the tree, and then the whole tree, as a result of which it dies.
The leaves begin to turn yellow and dry.
The reason for this phenomenon is the presence of a fungal disease or aphids, which sucks out all the juices from the leaves. It is best to carry out preventive measures than to deal with complex treatment later.
The leaves begin to curl and fall off.
The reason for this phenomenon may be the presence of aphids, which drinks all the juices, after which the leaves of the apple tree begin to curl and then fall off. In this case, the curvature of young shoots occurs. Aphids accumulate at the tips of the leaves, which is why it is best to carry out processing with Confidor and Spark, a decoction based on wormwood or garlic is a good folk remedy.
The leaves of the apple tree begin to fade.
A disease such as chlorosis appears most often in the summer. In this case, the leaves of the apple tree become almost white. If the disease is not yet very pronounced, treatment can be carried out with 2% ferrous sulfate. If the cause of the disease is a large amount of lime in the soil, then it will become impossible to grow fruit trees on such a site at all. You also need to pay attention to the state of the weed vegetation. This will help determine what caused the condition. if the weeds are white, alfalfa can be planted. You can also add rotted manure or ammonium sulfate or nitrate to the soil. It is not recommended to apply alkaline fertilizers, only those dressings that have an acidic reaction are suitable.
What measures should be taken in case of yellowing of a columnar apple tree.
If the foliage that has appeared not so long ago begins to wilt, then this may be the result of insufficient nutrition of the root system, if it has been damaged by various rodents. To remedy the situation, it is necessary to carry out the hilling procedure in order to stimulate the growth of adventitious roots. This method is suitable for dwarf species. This is due to the undersized crown of a young apple tree, which needs less nutrition. If the leaves of the apple variety begin to fall Beauty of Sverdlovskthen it may be due to powdery mildew. Also, those summer residents who are engaged in the cultivation of this variety say that both high air temperature and high humidity levels can cause yellowing of the leaves. Potash dressing is well suited to the variety.
Useful advice from summer residents.
Do not add wood ash and lime in large quantities. This can lead to a lack of sulfur and iron.If you incorrectly introduced these substrates into the soil, then you need to start adding ammonium sulfate or nitrate, in order to eliminate the negative effect, you can also add iron and sulfur. As we said earlier, if the scion and rootstock are incompatible, then this can also cause yellowing of the leaves. Incompatibility may be due to the grafting of unrelated crops. If, for example, you want to plant an apple tree on a pear. Such incompatible cultures can only bear fruit for a while. In this case, it may appear:
The color of the leaves changes to yellow.
Small fruits are formed and they are characterized by strong crumbling.
Poor winter frost tolerance; thickening in the area of grafting, etc. begin to appear.
We looked at the possible reasons why the leaves of the apple tree may start to turn yellow. Keep your apple orchard clean and healthy.