What causes pine needles to turn yellow?

The yellowing of the leaves of pine trees may be due to a lack of iron.

Iron is one of the more important elements, and ferrous sulfate or ammonium ferrous sulfate should be sprayed on the foliar surface as soon as possible.

This will soon be restored. It may also be that the temperature is uncomfortable, and the temperature must be controlled in early spring. It may also be too much watering, so reduce the amount of water and control the water treatment.

In addition, improper pruning can also cause yellow leaves. It is necessary to cut off the yellowed and dry branches and leaves in time to save nutrient consumption and promote faster recovery.

1. Iron deficiency.

Iron is an element that pine trees cannot live without. If there is a lack of iron, the leaves are prone to yellowing, and poor growth will occur. To spray the foliar foliar fertilizer as soon as possible, you can also choose ferrous sulfate fertilizer, ammonium ferrous sulfate, spray a few more times to recover.

Second, the temperature is uncomfortable.

In early spring, the temperature on the ground is too high and the temperature on the ground is too low, in this case, the aboveground part will grow, and the underground part can not provide water and nutrients to the plant normally, so it will lack nutrients and water, which will affect the growth, and the leaves are easy to yellow. In this case, it is advisable to control the temperature, especially in the early spring.

3. Overwatering.

The drought tolerance of pine trees is relatively strong, and the usual watering must be appropriate, usually once every three or four days in the spring and autumn growing season. If you water too often, it will be difficult to absorb all of them, and water will accumulate over time, especially for potted plants.

Maintained, easy to yellow leaves, rotten roots. The amount of water should be reduced, drainage should be drained in time, more ventilation should be provided, and the water should be evaporated. Note that the amount of water must be controlled in the later stage, and it is strictly forbidden to accumulate water.

Fourth, improper pruning.

The growth of pine trees also needs to be pruned properly, so that the tree shape will be better and more graceful. If you don't prune for a long time, there will be a lot of yellowing and dry leaves. It should be cut off as soon as possible to save nutrient consumption and promote a faster recovery.

Soil, water, fertilizer, disease and insect pests are not well mastered may lead to pine needles turning yellow, from the nature of the soil, pine likes slightly acidic soil, if the potted tree is replaced with alkaline soil, the pine will not adapt, showing that the pine needles turn yellow and gradually lose color, serious will shrink to death; Secondly, if the potting soil is wet or even too wet for a long time, it will cause the roots to turn yellow, which can cause the needles to wilt and the whole plant to die. Improper fertilization will also lead to the weakening of the tree, the growing season, to do thin fertilizer diligently, mainly mature fertilizer, high temperature season to avoid large fertilizer, to see the pine needles for the short color green shine is the best, must not be quick success, too heavy fertilization, will cause root burning, manifested in the tree potential for the leaves to become dark green and long, and then lead to needle yellow and rapid malaise; In addition, pests and diseases will also cause poor growth of pine trees, common diseases are prone to powdery mildew, mildew, etc., insects are beetles, red spiders, borers, etc., the growing season, to do half a month, pests and diseases at the same time, leaf medicine can be appropriately matched with trace foliar elements at the same time.

In terms of soil properties, pine likes slightly acidic soil, if the potted tree is replaced with alkaline soil, the pine tree will not adapt, showing that the pine needles turn yellow and gradually lose color, and will shrink to death in severe cases.

There are several possible reasons why pine needles turn yellow:

1.Lack of elements: Pine trees need iron during growth, and if the plant is deficient in iron, it will cause the pine needles to turn yellow and fall off, resulting in poor growth. At this time, ferrous sulfate fertilizer should be sprayed immediately to the foliar surface.

2.Uncomfortable temperature: In early spring, when the ground temperature is too high and the underground temperature is too low, the aboveground part of the pine tree grows vigorously, and the root system cannot properly provide water and nutrients to the branches and leaves, resulting in malnutrition of the plant and yellowing of the pine needles.

3.Overwatering: Pine trees are very drought tolerant, and if watered too often or with too much water, it is difficult for the root system to absorb them all. Over time, the root system will accumulate water, which will affect the transport of nutrients, causing the pine needles to turn yellow due to insufficient nutrients.

4.Improper pruning: If the pine tree is not pruned for a long time during the growing season, the branches and leaves will grow too luxuriantly, which will consume a lot of nutrients in the tree, causing the pine needles to turn yellow and dry up. At this time, the dense branches and foliage should be cut off immediately to preserve the strong branches.

The causative agent of pine defoliation disease is loose spot fungus and Japanese larch cococcus.

Symptoms: Coniferous disease begins with pale green spots, which soon appear as bright yellow spots and then develop into patches. Pale black-brown horizontal lines are formed between the spots, making pine needles.

Yellowing and shedding. Disease occurrence pattern: The fungus usually attacks the 2-year-old needles, and it occurs once a year. That is, the bacteria spend the winter in the sick needles that fall off to the ground, form ascospores from March to April, spread by wind from April to May, enter the pine needles from the stomata, and symptoms appear from June to July.

From April to May, when the humidity is high, it is suitable for spores to scatter and germinate, which is conducive to the occurrence and epidemic of the disease. When there is too much drought and lack of water, the disease resistance of forest trees is reduced, and it is easy to get sick. Weak plants transplanted that year are also susceptible to disease; The place where the same woodland is overgrown with weeds is seriously diseased, and the pathogenic center (or central diseased strain) and pathogen are mostly formed.

1.Clean up dead branches and leaves, and clean up dead trees immediately.

2.Regular spraying and construction, dry beauty and treatment, leaf force for prevention, easy to onset of the disease once every half a month.

3.Medication for diseased plants: root watering and construction, floating green No. 8 fertilizer; Trunk infusion, the use of dry beauty and treatment, tree heart pills with hanging injection; The leaves are sprayed once a week, and the leaves are dry, and the leaves are strong.

The pine needles of the pine trees turn yellow, mainly in the season of the phantom night, so after autumn, Song will really turn yellow, so that in the winter she will fall down and grow new pine needles.

Summary. Soil, water, fertilizer, disease and insect pests are not well mastered may lead to pine needles turning yellow, from the nature of the soil, pine likes slightly acidic soil, if the potted tree is replaced with alkaline soil, the pine will not adapt, showing that the pine needles turn yellow and gradually lose color, serious will shrink to death; Secondly, if the potting soil is wet or even too wet for a long time, it will cause the roots to turn yellow, which can cause the needles to wilt and the whole plant to die. Improper fertilization will also lead to the weakening of the tree, the growing season, to do thin fertilizer diligently, mainly mature fertilizer, high temperature season to avoid large fertilizer, to see the pine needles for the short color green shine is the best, must not be quick success, too heavy fertilization, will cause root burning, manifested in the tree potential for the leaves to become dark green and long, and then lead to needle yellow and rapid malaise; In addition, pests and diseases will also cause poor growth of pine trees, common diseases are prone to powdery mildew, mildew, etc., insects are beetles, red spiders, borers, etc., the growing season, to do half a month, pests and diseases at the same time, leaf medicine can be appropriately matched with trace foliar elements at the same time.

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Soil, water, fertilizer, disease and insect pests may cause pine needles to turn yellow, from the soil nature, pine likes slightly acidic soil, if the potted tree is replaced with alkaline soil, the pine will not adapt, showing that the pine needles turn yellow and gradually lose color, serious will shrink to death; Secondly, if the potting soil is wet or even too wet for a long time, it will cause the roots to turn yellow, which can cause the needles to wilt and the whole plant to die. Improper fertilization will also lead to the weakening of the tree, the growing season, to do thin fertilizer diligently, mainly mature fertilizer, high temperature season to avoid large fertilizer, to see the pine needles for the short color green shine is the best, must not be quick success, too heavy fertilization, will cause root burning, manifested in the tree potential for the leaves to become dark green and long, and then lead to needle yellow and rapid malaise; In addition, pests and diseases will also cause pine tree growth is poor, common diseases are prone to occur in the rainy season, such as white cave mealmildew, mildew, etc., insects are beetles, red spiders, borers, etc., the growing season, to do half a month, pests and diseases at the same time, leaf medicine can be appropriately matched with a slight amount of foliar elements is better.

1. Lack of elements: Lack of iron during the growth of pine trees.

2. Uncomfortable temperature: In early spring, the aboveground temperature is high, while the underground temperature is low, and the transportation of nutrients from the pine root system cannot keep up with the growth of branches and leaves. 3. Overwatering:

Watering loose soil too often or too much. 4. Improper pruning: pine trees are not pruned for a long time during the growth period, and the branches and leaves grow too luxuriantly.

1. Missing elements

Iron is an important element during the growth of pine trees, if the plant lacks iron, it will cause the pine needles to turn yellow and fall off, and there is a phenomenon of poor growth.

Fat. 2. Uncomfortable temperature

In early spring, when the aboveground temperature is too high and the underground temperature is too low, the aboveground part of the pine tree grows vigorously, and the root system cannot properly provide water and nutrients to the branches and leaves, which will cause malnutrition in the plant.

The pine needles then yellowed.

3. Overwatering:

Pine trees have strong drought tolerance, if they are watered too often or the amount of water rises too much, it is difficult for the root system to absorb all of them, and water accumulation will occur after a long time, which will affect the delivery of nutrients and cause pine needles to yellowish because of insufficient nutrients.

4. Improper pruning

If the pine tree is not pruned for a long time, the branches and leaves will grow too luxuriantly, which will consume a lot of nutrients in the tree, resulting in yellowing and drying of the pine needles.