What is the disease of yellow and curly lychee leaves, and how to treat it?

There are generally several possibilities for the yellowing of lychee leaves, and you can prescribe the right medicine:

1.When plants lack nitrogen, the old leaves first begin to turn yellow, and then gradually turn yellow from the bottom to the top, and urea and ammonium bicarbonate are supplemented from the roots or leaves in time.

Nitrogen fertilizers such as ammonium sulfate, or imported high-nitrogen water-soluble fertilizers, can promote the greening of leaves.

2.Crops lack phosphorus, the whole plant will turn dark green, and no luster, the leaves will also turn yellow, timely replenishment of superphosphate.

and other phosphorus fertilizers, which can promote the restoration of the luster of the leaves.

3.Crops, fruit trees, vegetables and flowers are deficient in potassium, the leaves will be uneven, and the edges of the leaves may also turn yellow and withered.

Potassium sulfate or powder potassium dihydrogen phosphate.

and other potassium fertilizers, which can relieve symptoms.

4.The plant is deficient in iron, the young leaves and the old leaves appear yellowing at the same time, the mesophyll of the young leaves turns yellow, the leaf veins are green, and the network-like yellow leaves are formed, and ferrous sulfate is generally watered.

However, the concentration should not be too large, and it can be applied in stages to avoid burning the roots.

5.Crops are deficient in calcium, and the young leaves turn yellow and curl, and can be applied to crushed egg shells.

Or Ribery Yanwo imported chelated calcium and magnesium fertilizer to reduce the harm.

6.Plants are deficient in magnesium, the leaves turn green and yellow, and finally dry up and die, and calcium, magnesium, phosphorus fertilizer, and magnesium sulfate are applied in time. Fat.

Prevention and control methods: First, strengthen cultivation management, increase the application of organic fertilizer and potassium fertilizer, enhance tree potential, and improve tree disease resistance; The second is to completely clear the garden in winter, cut off diseased branches and leaves, remove diseased branches, leaves and fruits on the ground, and burn them in a centralized manner; The third is the prevention and control of pesticides, when the fruiting tree is 2 3 times, the first spraying after the spring leaves of the unfruiting tree is sprayed, and then sprayed 1 2 times after 20 days. The agent is 50 carbendazim wettable powder 800 1000 times liquid, 70 mancozeb wettable powder 500 times liquid, or the same amount Bordeaux liquid.

Summary. Lychee tree leaf curls can be caused by a variety of reasons and are not necessarily a disease. Here are the reasons that can cause lychee tree leaves to curl::

1.Insufficient water: Lychee trees need plenty of water to grow healthy, and if the soil is too dry or lacking in water, the leaves will curl.

2.High-temperature drying: The high-temperature and dry environment can also cause lychee tree leaves to curl, which is caused by excessive transpiration of the plant.

3.Pests and diseases: Lychee trees may be attacked by pests and diseases, such as lychee scab, lychee leaf mites, etc., which can also cause lychee tree leaves to curl.

4.Malnutrition: Lychee trees need to absorb adequate nutrients during growth, and if the soil lacks the necessary nutrients, the leaves of the lychee tree become fragile and curly.

Therefore, curling leaves of lychee trees are not necessarily a disease and need to be judged on a case-by-case basis. If the leaves of the lychee tree are seriously curled, it is recommended to take corresponding measures in time, such as increasing the amount of watering, fertilizing, spraying pesticides, etc., to ensure the healthy growth of the lychee tree.

Curling leaves can be caused by a variety of reasons and are not necessarily a disease. The following are the reasons that may cause the leaves of the lychee tree to curl up and wither:1

Insufficient water: Lychee trees need plenty of water to grow healthy, and if the soil is too dry or lacking in water, the leaves will curl. 2.

High temperature and dryness: The high temperature and dry environment can also cause the leaves of the lychee tree to curl, which is caused by excessive transpiration of the plant. 3.

Pests and diseases: Lychee trees may be attacked by pests and diseases, such as lychee scab, lychee leaf mites, etc., which can also cause lychee tree leaves to curl. 4.

Malnutrition: Lychee trees need to absorb adequate nutrients during growth, and if the soil lacks the necessary nutrients, the leaves of the lychee tree become fragile and curly. Therefore, curling leaves of lychee trees are not necessarily a disease and need to be judged on a case-by-case basis.

If the leaves of the lychee tree are seriously curled, it is recommended to take corresponding measures in time, such as increasing the amount of watering, fertilizing, spraying pesticides, etc., to ensure the healthy growth of the lychee tree.

Fertilization is what fertilizer is applied.

Pro, you can apply some organic fertilizer or chemical fertilizer to supplement nutrients, and pay attention to the prevention and control of pests and diseases. Organic manure per mu includes manure, decompost, chicken manure, etc., which can provide the organic matter and nutrients required by plants. Chemical fertilizers can choose compound fertilizers containing nitrogen, phosphorus, potassium and other nutrients or special fertilizers.

The amount of fertilizer used should be adjusted appropriately according to factors such as the age, growth status and soil fertility of the lychee tree. In addition, it is also necessary to pay attention to the irrigation and drainage of lychee trees, keep the soil moist but not too wet, and avoid leaf curls caused by too much or too little water.

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What is the disease of yellow and curly leaves of lychee trees, and what do you need**?

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Hello, glad to answer for you. Yellowing and curly lychee leaves may be the following symptoms:1

Plants lack nitrogen, the old leaves first begin to turn yellow, and then gradually turn yellow from the bottom up, timely supplement urea, ammonium bicarbonate, ammonium sulfate and other nitrogen fertilizers from the roots or leaves, or import high-nitrogen water-soluble fertilizers, you can promote the leaves to turn green. 2.Crops lack phosphorus, the whole plant will become dark green, and no luster, the leaves will also become yellow, timely replenishment of potassium fertilizers such as superphosphate, can promote the recovery of the leaves luster.

3.Crops, fruit trees, vegetables and flowers are deficient in potassium, the leaves will be uneven, and the edges of the leaves may also turn yellow and withered. 4.

Plant iron deficiency, young leaves and old leaves at the same time yellowing, young leaves of the mesophyll yellow, leaf veins green, the formation of a network of yellow leaves, generally watered ferrous sulfate, but the concentration should not be too large, can be applied in stages, to avoid burning roots. 5.Crops lack calcium, young leaves turn yellow and curl, can be applied to crushed egg shells or Ribery Yanwo imported chelated calcium and magnesium fertilizer to reduce the harm.

6.Plants are deficient in magnesium, the leaves turn green and yellow, and finally quietly dry and die, and apply calcium, magnesium, phosphorus fertilizer, and magnesium sulfate fertilizer in time.

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If the leaves of the lychee tree appear yellowing, it is likely to be due to iron deficiency, if this reason is caused, you can supplement it with some ferrous sulfate, which can effectively improve the symptoms of yellow leaves. In addition, the amount of fertilizer should not be too large at ordinary times, and it is easy to yellow the leaves if it burns out its root system.

It also needs water to grow, and if the soil is dry for a long time, it will turn yellow due to lack of water. Therefore, at this time, it should be replenished as soon as possible, to ensure that its roots can absorb enough water, and if the moisture content in the soil is appropriate, it is also very beneficial to its growth.

In the process of cultivation, there is a high risk of fungal infection of lychee trees, which will also cause the leaves to turn yellow. Therefore, it is necessary to spray it with some medicine immediately, and also ensure good ventilation. If the planting ground is too shady, the leaves are prone to yellow spots, so the air must be circulated.

As mentioned above, it is necessary to ensure sufficient water, but it should be noted that there should be no water storage, if too much water cannot be discharged, its roots will be soaked in water and rot, which will cause the leaves to turn yellow. It is necessary to drain the excess water in time, and also pay attention to water control to ensure that the soil used is slightly wet.

1. Fertilization. The yellowing of lychee leaves is most likely due to iron deficiency. If this is the reason, you can supplement some ferrous sulfate, which can effectively improve the symptoms of yellow leaves. In addition, the amount of fertilizer should not be too large, if it burns out its root system, it is easy to turn the leaves yellow.

2. Hydration. It also needs water to grow. If the soil is dry for a long time, it will turn yellow due to lack of water.

Therefore, at this time, it is necessary to replenish water as soon as possible to ensure that its roots can absorb enough water. If the soil has the right moisture content, it is also very beneficial for its growth.

3. Spraying. During the cultivation process, lychee trees are likely to be infected by fungi, which will also cause the leaves to turn yellow. Therefore, it is necessary to spray some drugs immediately and ensure better ventilation. If the ground is too shady, yellow spots can easily appear on the leaves, so be sure to circulate the air.

3. Drainage. As mentioned above, it is necessary to ensure sufficient water, but it should be noted that there must be no water storage. If too much water cannot be drained, its roots will be weakened or soaked in water and rot, causing the leaves to turn yellow.

It is necessary to drain the excess water in time, pay attention to water control, and ensure that the soil used is slightly wet.