How to effectively control yellow leaf disease in citrus fruit trees

1. Strengthen water and fertilizer management.

Fertilize citrus in a timely manner, using diluted nitrogen, phosphorus and potassium compound fertilizers. When citrus is in the growing season, it needs to be fertilized once every 10-15 days. In summer, the temperature is high, and fertilization is applied once every 15-20 days. In winter, when temperatures are low, citrus enters a dormant period and fertilizer is stopped.

Citrus needs plenty of water to grow, and it is watered every 2-3 days in spring and autumn. In summer, the temperature is high, the water evaporates quickly, and it is watered once every 1-2 days. In winter, when the temperature is low, the amount of watering and the number of watering times can be appropriately reduced to ensure that the soil is moist.

2. Repair the root system.

For root problems such as root burning and dead seedlings, soil chef soil enzyme rooting agent can be used to repair the root system and supplement nutrients; The longhorn beetle causes yellowing, and it can be prevented by mixing mud with dichlorvos and other stirring mud to smear the trunk; Citrus root-knot nematodes are generally controlled by avi-thiazolphosphine, etc., and there are other citrus root-knot nematode control agents on the market.

3. Pest control.

In general, in spring and autumn, it is the season of high incidence of pests and diseases. If the leaves are yellow due to pests and diseases, cut off all the leaves that have turned yellow, and then use an appropriate amount of insecticide to control the leaves.

If the citrus tree is more severely infestation, it is recommended to dig it out directly to avoid the spread of pests and diseases. Generally speaking, citrus huanglongbing can be transmitted, and citrus huanglongbing is generally recommended to use imidacloprid and other control of psyllids to prevent the spread of huanglongbing.

1. In the previous year, there was a large amount of hanging, insufficient fertilization before germination, and the nutritional imbalance and lack of nutrients led to the situation of yellow leaves.

2. Root system problems, there are few new capillary roots, and nutrients cannot be given to the leaves.

3. The amount of nitrogen fertilizer is too small, and now many people use high-phosphorus and high-potassium fertilizers in the early stage, resulting in uneven application of nitrogen fertilizer.

So if we solve it, it is recommended that the underground should be based on rooting and nourishing the land, and use the self-nutrient biological fertilizer with the suspended carbon liquid to balance the water-soluble fertilizer, so that the root nutrition can be replenished, and the growth can be restored.

Foliar spraying of medium and trace element fertilizers, such as organic acid boron calcium foliar fertilizer, improve the photosynthesis of plants, promote the supplement of a variety of medium and trace elements, for the reduction of yellow leaves The effect is still good, if the growth is poor, you can add some urea.

1.There are many reasons why the leaves of oranges turn yellow.

2.If it is because the soil is not suitable, it is necessary to improve the soil quality or change the soil in time.

3.If it is due to strong sunlight, proper shade is required to avoid sunburn on the plant.

4.If it is due to a lack of nutrients, you need to supplement a little fertilizer.

5.If it is due to insufficient moisture, it needs to be watered properly to allow the soil to have a certain amount of moisture.

1. Lack of nutrition.

The yellowing of citrus leaves may be due to a lack of nutrients, and the healthy growth of the plant needs to be supplemented with sufficient nutrients, otherwise malnutrition will occur and the leaves will turn yellow, and it is necessary to spray urea and potassium dihydrogen phosphate for the citrus trees every 10 days to help the plants recover their growth.

2. Caused by insect pests.

Citrus trees will consume a lot of nutrients in the growth period and fruiting period, resulting in weak growth, easy to cause red spiders, aphids and other insect pests, resulting in yellow and falling off leaves.

3. Strong light exposure.

When the citrus tree is exposed to strong light in summer, the leaves will be burned, yellowing and sunburning, and even dehydration and falling, at this time, the sunburned branches and leaves should be cut off in time, and the plants will be moved to a semi-shaded place for maintenance, and the citrus tree will resume its growth in about a week.

Conservation management of citrus

Citrus is suitable for growing in the soil with deep soil layer and good drainage, when planting citrus, it is necessary to choose soil with rich organic matter and pH less than 8, and to apply well-rotted organic fertilizer, superphosphate, etc. to the soil, which is conducive to the vigorous growth of citrus.

Citrus is not drought tolerant, when cultivating citrus, if the environment is too dry, it will cause the branches and leaves of the plant to dry out, and will affect the yield of citrus, you need to water the citrus when there is no rain, you can directly water the water to the roots of the plant, so that it can be quickly absorbed.

When cultivating citrus, it is necessary to cut off the flower buds that grow too much after the plant blooms, so that the nutrients of the citrus are concentrated to the fruiting branches, and after the citrus bears fruit, it is necessary to remove the deformed and overgrown fruits, so as not to lose excess nutrients and increase the yield of citrus.

It could be due to insufficient light, rot, pests and diseases, or insufficient soil fertility. When encountering these problems, we must prescribe the right medicine, and then we should also spray some pesticides to remove insect pests in time to strengthen the management of water and fertilizer.

It can be due to nutrient deficiencies, malnutrition, glue overload, or lack of light. It can be distinguished by the symptoms and morphology of the plant.

Lack of water, lack of nutrients, weather reasons, land reasons, it is possible that it is sick, it can be determined by the time when the leaves are yellow, and can be determined by different colors.

The yellow leaves of fruit trees may be caused by too high or too low temperature, which can be controlled by irrigation to cool down or take measures to prevent cold and keep warm. The pesticide damage will cause the leaves to turn yellow when spraying the solution, and the pesticide damage can be diluted immediately to alleviate the pesticide damage. When the fruit tree is deficient in iron, it is easy to yellow the leaves, and the ferrous sulfate that can be sprayed can be sprayed once every 10 days, and sprayed 3 times in a row, and the control effect is obvious.

1. What is the reason for the yellow leaves of fruit trees?

1. If the temperature is too high or too low, the leaves of the fruit tree will turn yellow, when the temperature continues to be too high, the leaf stomata will become larger, and it will turn yellow due to water loss, and the temperature will continue to be too low, and the leaf stomata will be closed, and it will turn yellow due to shutdown.

2. When spraying fruit trees, if the concentration of the liquid is too high, it is easy to burn the leaves, resulting in yellowing of the leaves.

3. There are often pests and diseases in the root system of fruit trees, such as root-knot nematode disease, root rot, etc., which will cause the root system of fruit trees to rot, and the roots can not absorb nutrients and water, resulting in the inability of plant nutrients to deliver nutrients to leaves and fruits, resulting in the occurrence of yellow leaf disease.

4. When fruit trees are deficient in iron, the synthesis of chlorophyll in leaves will be affected, which is manifested as albinism, greening, yellow leaves, etc.

5. A large amount of heavy wet soil is adhered to the root system of fruit trees, which will be compacted for a long time, resulting in the inability of the roots to breathe, and the inability of oxygen to be absorbed by the roots, resulting in the occurrence of yellow leaf disease.

Second, prevention and control methods

1. When the temperature is too high or too low, it is necessary to pay attention to the prevention and control measures, if it is too high, it is necessary to irrigate and replenish water in time; If the temperature is too low, pay attention to water control and take measures to protect against cold and keep warm.

2. When spraying pesticides on fruit trees, it is necessary to choose low-toxicity and green pesticides, and use them in strict accordance with the instructions.

3. For the prevention and control of fruit tree root diseases and pests, a small amount of carbendazim can be added to the soil for disinfection, which can effectively prevent and control yellow leaf disease.

4. During the growth period of fruit trees, the ferrous sulfate or ferric citrate sprayed on the fruit trees should be sprayed once every 10 days, and sprayed 3-4 times continuously, which has a certain control effect on the yellow leaves caused by iron deficiency.

5. Do not irrigate fruit trees too often, if the soil is compacted due to poor drainage, it is necessary to loosen the soil near the root system of fruit trees in time to ensure that the roots can absorb sufficient oxygen.