What s wrong with yellowing leaves of apple trees?

There are many reasons for the yellowing of apple leaves, but there are three main types: nutrient deficiency, root disease and root insect pests

1. Deficiency of nutrients. For example, the lack of zinc, manganese and other elements can cause yellowing leaves, and organic fertilizer and trace elements should be added.

2. Root disease. Root rot can be irrigated with a vicious aqueous solution or 9281, or the tree tray can be covered with plant ash.

3. Root insect pests. Root insect pests can generally be irrigated with stomach poison.

Apple Tree Introduction:

Apple trees are deciduous trees, usually trees can reach up to 15 meters tall, but cultivated trees are generally only about 3-5 meters tall. The trunk is grayish-brown, and the bark is shedding to a certain extent. The fruit is generally red in color, but it depends on the variety.

The fruit of the apple tree is rich in minerals and vitamins and is one of the most commonly consumed fruits.

The flowering period of apple trees depends on the local climate, and is generally concentrated in April and May. Apples are cross-pollinated plants, and most varieties do not produce fruit and fruit on their own.

1. Improper watering.

Proper watering can ensure the normal growth of good apple trees, once watering too little or too much, it will cause water imbalance, causing the leaf root system to be affected, resulting in yellowing of the leaves. Watering should be adjusted, when the soil is short of water and the roots cannot absorb water, they should be watered in time to replenish water. When there is too much watering or heavy rain, a drainage ditch can be built to drain the stagnant water.

2. Improper fertilization.

In the growth and breeding stage of apple trees, if a certain nutrient is lacking, it will lead to a lack of vegetarian yellow. Failure to control the amount of fertilizer, or the use of thick fertilizer or raw fertilizer, will also lead to fertilizer damage, and then yellow leaves. Adjust fertilization according to the situation, lack of nutrients to correspond to fertilization, if too much fertilization needs to stop fertilization, water the roots of the tree to dilute.

3. The impact of drug damage.

If the concentration of pesticides is too high when spraying, it may cause pesticide damage and turn the leaves yellow. When spraying drugs, the type should be selected, and the dispensing should be diluted according to the instructions, and the use of drugs with higher concentrations should be avoided.

Fourth, soil compaction.

During growth and breeding, if the soil is compacted and not breathable, it will be difficult for the root system to absorb water and fertilizer normally, and the leaves of the apple tree will also turn yellow. It is necessary to loosen the soil regularly and apply well-rotting organic fertilizer to improve the soil.

5. Other reasons.

In addition to the above-mentioned reasons, improper pruning, lack of sunlight, aging leaves, etc. can all cause yellowing of leaves.

There are two reasons for the yellow leaves of apple trees, one is the yellow leaves caused by excessive branches, and the other is that the yellow leaves are easy to appear due to fertilization.

Due to the small spacing of fruit trees and the large number of crown branches, the inner chamber and lower leaves of the crown can not photosynthesize to produce dry matter, and such leaves become consumables for the growth of fruit trees, and physiological yellowing and defoliation naturally occur.

Summer pruning should be carried out in time to ensure ventilation and light in the canopy, which is the best way to prevent this from happening.

The fertilization time interval is long, in the spring budding and leaf flowering period, autumn branch and leaf growth and fruit expansion period, the tree consumes a large amount of nutrients, if it is not replenished in time, there will be defertilization, and the leaves will appear yellow flowers.

The nutrient content of organic fertilizer is comprehensive, and the soil can be improved after application, and the soil fertilizer is easy and slippery, and the fertilizer effect period is long and stable. It is especially used in orchards where the goldenrod phenomenon occurs, which is conducive to the recovery of leaf green.

The reasons for <> yellow leaves of apple trees are generally as follows: in the process of growth, the fruit tree lacks iron and the soil is alkaline; Fruit trees infected with mosaic virus; Excessive or too little fertilization and watering, and untimely drainage in rainy weather; The operation is not standardized during ring stripping; The canopy of fruit trees is too dense, which hinders the photosynthesis of the foliage inside.

1. What's going on with apple trees with yellow leaves?

1. After entering the rainy season, the lack of iron in the growth process of apple trees, especially the young trees that have just been planted for 1-2 years on alkaline soil, and the yellow leaves are more serious.

2. The apple tree is infected with the apple mosaic virus, which causes the leaves to turn yellow.

3. The management method of the grower is inappropriate, the fertilization and water application are unreasonable, and the drainage is not timely, resulting in the yellowing of the leaves caused by poor root respiration.

4. During this period of about 10-15 days, the leaves will have a period of yellowing, which is a normal phenomenon, but if the ring stripping is not standardized, the yellowing time of the leaves will be prolonged and more serious.

5. There are too many branches and leaves at the top of the apple tree, resulting in the leaves inside not getting enough light, and the phenomenon of physiological yellowing and defoliation occurs.

6. Pests on apple trees cause yellowing of leaves.

2. What to do if the apple tree has yellow leaves.

1. Spray ferrous sulfate solution, or urea and ferrous sulfate mixture, or fulvic acid diferamine 200-300 times liquid and other organic iron fertilizers on the branches and leaves of yellow leaves, or compound iron fertilizer with citric acid and ammonium ferrous sulfate (50kg of water + 50g of citric acid + 150g of ferrous sulfate + 100g of urea).

2. Around the middle of July, spray with 300-450 times the liquid of "virus number", and pure milk can be added to the solution. Or spray with 1000 times of morphinguanidine hydrochloride copper acetate or phytolingl emulsion, spray once every 10-15 days, a total of 2-3 sprays.

3. If there is continuous rainy weather, drain the water in time to avoid water accumulation in the orchard, which will affect the breathing of the roots of the apple tree, and loosen the soil in a timely manner. If the weather is dry, water in time to ensure that the soil is well hydrated.

4. After ring stripping, check the healing of the fruit tree every once in a while, if there is a wound that has not healed, smear mud on the wound in time and then wrap the wound with plastic film to promote wound healing, and at the same time you can spray urea 300 times, spray every 7 days, or 1000 times of Green Fenwei No. 2.

5. When the top branches and leaves are too lush, prune the apple tree in time to ensure the ventilation and light transmission of the leaves inside.

6. Dig a ring ditch around the crown of the tree, the ditch is 50cm deep and 60cm wide, and then dissolve ferrous sulfate with 10 times the water, and then mix it according to the ratio of ferrous sulfate: humus organic fertilizer = 1:15, and apply it in the annular ditch, if it is a tree of more than 10 years, apply 80-100kg, and apply 30-50kg for less than 10 years.

1. Lack of nutrients.

Lack of nutrients is the first factor that many fruit farmers think of, in the actual planting process, the lack of nutrients will indeed cause the fruit trees to lose green and yellow, such as nitrogen deficiency, the leaves turn yellow and fall off; When magnesium is deficient, the middle leaf veins lose green and turn yellow; When zinc is deficient, there will be green loss and spots; When boron is deficient, the leaves curl up, turn yellow and lose green, and have yellow spots, but other elements can also cause green loss.

This situation can be alleviated by timely fertilizer supplementation, and it is better to combine top dressing and foliar fertilization.

2. Soil problems.

When there is a problem with the soil itself, it will also cause the fruit tree to turn yellow and lose green, such as when the pH value in the soil is too high or too low, it may cause this phenomenon, under normal circumstances, when the pH value is greater than or less, it will affect the normal growth of the fruit tree, resulting in nutritional imbalance of the fruit tree.

In this case, it is necessary to "repair" the soil, which is a long-term process, such as applying farm fertilizer, reducing the amount of agricultural inputs, and applying different fertilizers according to the specific pH level of the field.

3. Temperature. When the fruit tree is in a high temperature state for a long time, the respiration of the fruit tree will be greater than that of photosynthesis, and the root system will do anaerobic respiration, resulting in a decrease in the absorption capacity of the root system, affecting the synthesis of chlorophyll, and then the leaves will show yellowing and green loss.

On the contrary, when the fruit tree is in a low temperature state for a long time, it will also affect the growth of the fruit tree, such as in early spring, the ground temperature rises slowly, and the leaf part has begun to grow, but the underground part is not enough to ensure the growth of the aboveground part, which is easy to cause insufficient nutrition and water, and finally the leaves appear yellow and green.

4. Moisture. If there is too much water in the orchard, there is water in the field, after the waterlogging, the roots are hypoxic, and they are forced to carry out anaerobic respiration, which will form toxic substances and affect the normal metabolism, and at the same time, some trace elements in the fruit tree will also be lost, resulting in the yellowing and loss of green leaves, pay attention to the drainage measures in the orchard to avoid long-term water accumulation.

5. Pests and diseases.

In the process of fruit tree growth, the invasion of pests and diseases will also cause the leaves to turn yellow and lose green, some pathogens and pathogens will invade the leaves, destroy chlorophyll, in addition to fruit trees, the loss of green caused by viruses is also more common, and the harm of red spiders and aphids will also cause the leaves to lose green and yellow, pay attention to timely spraying of pesticides for prevention.